Adding upstream version 2.1.1.upstream/2.1.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

214 files changed, 55626 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
new file mode 100644
index 0000000..b7a72de
--- /dev/null
+++ b/test/Makefile.am
@@ -0,0 +1,28 @@
+SUBDIRS = \
+	gdb \
+	flat_segment_tree \
+	include \
+	multi_type_vector \
+	multi_type_matrix \
+	point_quad_tree \
+	rtree \
+	segment_tree \
+	sorted_string_map \
+	trie_map
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = \
+	ref-pair-test
+
+ref_pair_test_SOURCES = \
+	ref_pair_test.cpp \
+	test_global.cpp
+
+TESTS = \
+	ref-pair-test
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/Makefile.in b/test/Makefile.in
new file mode 100644
index 0000000..237f348
--- /dev/null
+++ b/test/Makefile.in
@@ -0,0 +1,1104 @@
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+	$(am__define_uniq_tagged_files); \
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+	  if test $$# -gt 0; then \
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+	     $$unique
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+GTAGS:
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+
+# Recover from deleted '.trs' file; this should ensure that
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+	$(MAKE) $(AM_MAKEFLAGS) $<
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+	if test -n "$$redo_bases"; then \
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+	  redo_results=`for i in $$redo_bases; do echo $$i.trs; done`; \
+	  if $(am__make_dryrun); then :; else \
+	    rm -f $$redo_logs && rm -f $$redo_results || exit 1; \
+	  fi; \
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+	       "recursion detected" >&2; \
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+	if $(am__make_dryrun); then :; else \
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+	  for i in $$redo_bases; do \
+	    test -f $$i.trs && test -r $$i.trs \
+	      || { echo "$$errmsg $$i.trs" >&2; st=1; }; \
+	    test -f $$i.log && test -r $$i.log \
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+	  done; \
+	  test $$st -eq 0 || exit 1; \
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+	@$(am__sh_e_setup); $(am__tty_colors); $(am__set_TESTS_bases); \
+	ws='[ 	]'; \
+	results=`for b in $$bases; do echo $$b.trs; done`; \
+	test -n "$$results" || results=/dev/null; \
+	all=`  grep "^$$ws*:test-result:"           $$results | wc -l`; \
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+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
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+	  success=false; \
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+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
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+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
+	create_testsuite_report --maybe-color;				\
+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
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+	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
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+	log_list=`echo $$log_list`; trs_list=`echo $$trs_list`; \
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+	log_list=`echo $$log_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
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+	b='test-main'; \
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+	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
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+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	for file in $$dist_files; do \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
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+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
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+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+	-test -z "$(top_builddir)/test/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(am__dirstamp)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+check-valgrind: check-valgrind-am
+
+check-valgrind-am: check-valgrind-local
+
+check-valgrind-drd: check-valgrind-drd-am
+
+check-valgrind-drd-am: check-valgrind-drd-local
+
+check-valgrind-helgrind: check-valgrind-helgrind-am
+
+check-valgrind-helgrind-am: check-valgrind-helgrind-local
+
+check-valgrind-memcheck: check-valgrind-memcheck-am
+
+check-valgrind-memcheck-am: check-valgrind-memcheck-local
+
+check-valgrind-sgcheck: check-valgrind-sgcheck-am
+
+check-valgrind-sgcheck-am: check-valgrind-sgcheck-local
+
+clean: clean-am
+
+clean-am: clean-checkPROGRAMS clean-generic mostlyclean-am
+
+distclean: distclean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/flat_segment_tree/test_main.cpp b/test/flat_segment_tree/test_main.cpp
new file mode 100644
index 0000000..c0f5f66
--- /dev/null
+++ b/test/flat_segment_tree/test_main.cpp
@@ -0,0 +1,2590 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2008-2023 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "mdds/flat_segment_tree.hpp"
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <limits>
+#include <iterator>
+#include <algorithm>
+#include <memory>
+
+using namespace mdds;
+
+void print_title(const char* msg)
+{
+    cout << "+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++" << endl;
+    cout << " " << msg << endl;
+    cout << "+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++" << endl;
+}
+
+void fst_test_leaf_search()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    {
+        print_title("Simple insert test");
+        flat_segment_tree<int, int> int_ranges(0, 100, -1);
+        for (int i = 0; i < 20; ++i)
+        {
+            int start = i * 5;
+            int end = start + 5;
+            int_ranges.insert_front(start, end, i);
+        }
+        int_ranges.dump_leaf_nodes();
+    }
+
+    {
+        print_title("Merge test 1");
+        flat_segment_tree<int, int> merge_test(0, 100, -1);
+        merge_test.insert_front(10, 20, 5);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(15, 30, 5);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(30, 50, 5);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(8, 11, 5);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(5, 8, 5);
+        merge_test.dump_leaf_nodes();
+    }
+
+    {
+        print_title("Merge test 2");
+        flat_segment_tree<int, int> merge_test(0, 100, -1);
+
+        // This should not change the node configuration.
+        merge_test.insert_front(10, 90, -1);
+        merge_test.dump_leaf_nodes();
+
+        for (int i = 10; i <= 80; i += 10)
+            merge_test.insert_front(i, i + 10, i);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(10, 90, -1);
+        merge_test.dump_leaf_nodes();
+
+        for (int i = 10; i <= 80; i += 10)
+            merge_test.insert_front(i, i + 10, i);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(8, 92, -1);
+        merge_test.dump_leaf_nodes();
+
+        for (int i = 10; i <= 80; i += 10)
+            merge_test.insert_front(i, i + 10, i);
+        merge_test.dump_leaf_nodes();
+        merge_test.insert_front(12, 88, 25);
+        merge_test.dump_leaf_nodes();
+    }
+
+    {
+        print_title("Search test");
+        flat_segment_tree<int, int> db(0, 100, -1);
+        for (int i = 0; i < 10; ++i)
+        {
+            int key = i * 10;
+            int val = i * 5;
+            db.insert_front(key, key + 10, val);
+        }
+        db.dump_leaf_nodes();
+        for (int i = 0; i <= 100; ++i)
+        {
+            int val = 0;
+            if (db.search(i, val).second)
+                cout << "key = " << i << "; value = " << val << endl;
+            else
+                cout << "key = " << i << "; (value not found)" << endl;
+        }
+        for (int i = 0; i <= 100; ++i)
+        {
+            int val = 0, start, end;
+            if (db.search(i, val, &start, &end).second)
+                cout << "key = " << i << "; value = " << val << "(span: " << start << " - " << end << ")" << endl;
+            else
+                cout << "key = " << i << "; (value not found)" << endl;
+        }
+    }
+}
+
+void fst_test_leaf_search_2()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    using db_type = mdds::flat_segment_tree<int32_t, std::string>;
+    db_type db(0, 8, "-");
+    db.insert_back(2, 4, "2-4");
+    db.insert_back(4, 6, "4-6");
+
+    db_type::const_iterator it = db.search(-1); // out-of-bound
+    assert(it == db.end());
+
+    it = db.search(8); // out-of-bound
+    assert(it == db.end());
+
+    struct check
+    {
+        int32_t key;
+        int32_t start;
+        int32_t end;
+        std::string value;
+    };
+
+    std::vector<check> checks = {
+        {0, 0, 2, "-"},   {1, 0, 2, "-"},   {2, 2, 4, "2-4"}, {3, 2, 4, "2-4"},
+        {4, 4, 6, "4-6"}, {5, 4, 6, "4-6"}, {6, 6, 8, "-"},   {7, 6, 8, "-"},
+    };
+
+    // variant of search() without a position hint
+    for (const auto& c : checks)
+    {
+        it = db.search(c.key);
+        assert(it != db.end());
+        assert(it->first == c.start);
+        assert(it->second == c.value);
+
+        auto sit = it.to_segment();
+        assert(sit->start == c.start);
+        assert(sit->end == c.end);
+        assert(sit->value == c.value);
+    }
+
+    // variant of search() with a position hint
+
+    it = db.search(db.begin(), -1); // out-of-bound
+    assert(it == db.end());
+
+    it = db.search(db.begin(), 8); // out-of-bound
+    assert(it == db.end());
+
+    it = db.begin();
+    for (const auto& c : checks)
+    {
+        it = db.search(it, c.key);
+        assert(it != db.end());
+        assert(it->first == c.start);
+        assert(it->second == c.value);
+
+        auto sit = it.to_segment();
+        assert(sit->start == c.start);
+        assert(sit->end == c.end);
+        assert(sit->value == c.value);
+    }
+}
+
+/**
+ * Test tree construction of flat_segment_tree.
+ */
+void fst_test_tree_build()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    {
+        int lower = 0, upper = 100, delta = 10;
+        flat_segment_tree<int, int> db(lower, upper, 0);
+        {
+            stack_printer __stack_printer2__("::fst_test_tree_build insertion");
+            for (int i = lower; i < upper; i += delta)
+                db.insert_front(i, i + delta, i * 2);
+        }
+        db.dump_leaf_nodes();
+
+        {
+            stack_printer __stack_printer2__("::fst_test_tree_build tree construction");
+            db.build_tree();
+            db.dump_tree();
+        }
+    }
+
+    {
+        flat_segment_tree<int, int> db(0, 10, 0);
+        db.dump_leaf_nodes();
+    }
+}
+
+void fst_perf_test_search_leaf()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    int lower = 0, upper = 50000;
+    flat_segment_tree<int, int> db(lower, upper, 0);
+    for (int i = upper - 1; i >= lower; --i)
+        db.insert_front(i, i + 1, i);
+
+    int success = 0, failure = 0;
+    int val;
+    for (int i = lower; i < upper; ++i)
+    {
+        if (db.search(i, val).second)
+            ++success;
+        else
+            ++failure;
+    }
+    fprintf(stdout, "fst_perf_test_search_leaf:   success (%d)  failure (%d)\n", success, failure);
+}
+
+void fst_perf_test_search_tree()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    int lower = 0, upper = 5000000;
+    flat_segment_tree<int, int> db(lower, upper, 0);
+    for (int i = upper - 1; i >= lower; --i)
+        db.insert_front(i, i + 1, i);
+
+    {
+        stack_printer sp2("::fst_perf_test_search_tree (build tree)");
+        db.build_tree();
+    }
+
+    int success = 0, failure = 0;
+    {
+        stack_printer sp2("::fst_perf_test_search_tree (search tree)");
+        int val;
+        for (int i = lower; i < upper; ++i)
+        {
+            if (db.search_tree(i, val).second)
+                ++success;
+            else
+                ++failure;
+        }
+    }
+
+    fprintf(stdout, "fst_perf_test_search:   success (%d)  failure (%d)\n", success, failure);
+}
+
+void fst_test_tree_search()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int, int> fst_type;
+    int lower = 0, upper = 200, delta = 5;
+    fst_type db(lower, upper, 0);
+    for (int i = lower; i < upper; i += delta)
+        db.insert_front(i, i + delta, i);
+
+    db.build_tree();
+    db.dump_tree();
+    db.dump_leaf_nodes();
+
+    int val, start, end;
+    int success = 0, failure = 0;
+    for (int i = lower - 10; i < upper + 10; ++i)
+    {
+        if (db.search_tree(i, val, &start, &end).second)
+        {
+            cout << "key = " << i << "; value = " << val << " (" << start << "-" << end << ")" << endl;
+            ++success;
+        }
+        else
+        {
+            ++failure;
+            cout << "key = " << i << " (search failed)" << endl;
+        }
+    }
+    cout << "search: success (" << success << ")  failure (" << failure << ")" << endl;
+
+    // Make sure search_tree() returns correct iterator position.
+    db.clear();
+    db.insert_back(5, 10, 2);
+    db.insert_back(15, 18, 3);
+    db.insert_back(23, 28, 4);
+    db.build_tree();
+
+    typedef std::pair<fst_type::const_iterator, bool> ret_type;
+    ret_type ret = db.search_tree(0, val, &start, &end);
+    assert(ret.second);
+    assert(start == 0 && end == 5 && val == 0);
+    assert(ret.first == db.begin());
+
+    ret = db.search_tree(6, val, &start, &end);
+    assert(ret.second);
+    assert(start == 5 && end == 10 && val == 2);
+    fst_type::const_iterator check = db.begin();
+    ++check; // 5-10 is the 2nd segment from the top.
+    assert(ret.first == check);
+
+    ret = db.search_tree(17, val, &start, &end);
+    assert(ret.second);
+    assert(start == 15 && end == 18 && val == 3);
+    std::advance(check, 2);
+    assert(ret.first == check);
+
+    ret = db.search_tree(55, val, &start, &end);
+    assert(ret.second);
+    assert(start == 28 && end == upper && val == 0);
+    std::advance(check, 3);
+    assert(ret.first == check);
+
+    ret = db.search_tree(upper + 10, val, &start, &end);
+    assert(!ret.second); // This search should fail.
+    assert(ret.first == db.end());
+}
+
+void fst_test_tree_search_2()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    using db_type = mdds::flat_segment_tree<int32_t, std::string>;
+    db_type db(0, 8, "-");
+    db.insert_back(2, 4, "2-4");
+    db.insert_back(4, 6, "4-6");
+
+    db.build_tree();
+
+    db_type::const_iterator it = db.search_tree(-1); // out-of-bound
+    assert(it == db.end());
+
+    it = db.search_tree(8); // out-of-bound
+    assert(it == db.end());
+
+    struct check
+    {
+        int32_t key;
+        int32_t start;
+        int32_t end;
+        std::string value;
+    };
+
+    std::vector<check> checks = {
+        {0, 0, 2, "-"},   {1, 0, 2, "-"},   {2, 2, 4, "2-4"}, {3, 2, 4, "2-4"},
+        {4, 4, 6, "4-6"}, {5, 4, 6, "4-6"}, {6, 6, 8, "-"},   {7, 6, 8, "-"},
+    };
+
+    // variant of search() without a position hint
+    for (const auto& c : checks)
+    {
+        it = db.search_tree(c.key);
+        assert(it != db.end());
+        assert(it->first == c.start);
+        assert(it->second == c.value);
+
+        auto sit = it.to_segment();
+        assert(sit->start == c.start);
+        assert(sit->end == c.end);
+        assert(sit->value == c.value);
+    }
+}
+
+void test_single_tree_search(const flat_segment_tree<int, int>& db, int key, int val, int start, int end)
+{
+    int r_val, r_start, r_end;
+    if (db.search_tree(key, r_val, &r_start, &r_end).second)
+        assert(r_val == val && r_start == start && r_end == end);
+    else
+        assert(!"tree search failed!");
+}
+
+template<typename key_type, typename value_type>
+void build_and_dump(flat_segment_tree<key_type, value_type>& db)
+{
+    db.build_tree();
+    db.dump_tree();
+    db.dump_leaf_nodes();
+}
+
+template<typename key_type, typename value_type>
+bool check_leaf_nodes(
+    const flat_segment_tree<key_type, value_type>& db, const key_type* keys, const value_type* values, size_t key_size)
+{
+    if (key_size <= 1)
+        return false;
+
+    std::vector<key_type> key_checks;
+    key_checks.reserve(key_size);
+    for (size_t i = 0; i < key_size; ++i)
+        key_checks.push_back(keys[i]);
+
+    if (!db.verify_keys(key_checks))
+        return false;
+
+    std::vector<value_type> value_checks;
+    value_checks.reserve(key_size - 1);
+    for (size_t i = 0; i < key_size - 1; ++i)
+        value_checks.push_back(values[i]);
+
+    if (!db.verify_values(value_checks))
+        return false;
+
+    return true;
+}
+
+template<typename key_type, typename value_type>
+bool is_iterator_valid(
+    const typename flat_segment_tree<key_type, value_type>::const_iterator& beg,
+    const typename flat_segment_tree<key_type, value_type>::const_iterator& end, const key_type* keys,
+    const value_type* values, size_t key_size)
+{
+    assert(key_size > 1);
+
+    typedef flat_segment_tree<key_type, value_type> container;
+    typename container::const_iterator itr;
+    size_t idx = 0;
+    for (itr = beg; itr != end; ++itr, ++idx)
+    {
+        if (idx >= key_size)
+            // out-of-bound index
+            return false;
+
+        // Check the key first.
+        if (keys[idx] != itr->first)
+            return false;
+
+        if (idx < key_size - 1)
+        {
+            // Check the value only if it's not the last node.  The last node
+            // may have an arbitrary value.
+            if (values[idx] != itr->second)
+                return false;
+        }
+    }
+
+    // At this point, the iterator should be at the end position.
+    if (itr != end)
+        return false;
+
+    // Check the keys and values again but go to the opposite direction.
+    do
+    {
+        --itr;
+        --idx;
+
+        // key
+        if (keys[idx] != itr->first)
+            return false;
+
+        // value
+        if (idx < key_size - 1)
+        {
+            if (values[idx] != itr->second)
+                return false;
+        }
+    } while (itr != beg);
+
+    return true;
+}
+
+template<typename key_type, typename value_type>
+bool is_iterator_valid(
+    const typename flat_segment_tree<key_type, value_type>::const_reverse_iterator& beg,
+    const typename flat_segment_tree<key_type, value_type>::const_reverse_iterator& end, const key_type* keys,
+    const value_type* values, size_t key_size)
+{
+    assert(key_size > 1);
+
+    typedef flat_segment_tree<key_type, value_type> container;
+    typename container::const_reverse_iterator itr;
+    size_t idx = key_size - 1;
+    for (itr = beg; itr != end; ++itr, --idx)
+    {
+        if (idx >= key_size)
+            // out-of-bound index
+            return false;
+
+        // Check the key first.
+        if (keys[idx] != itr->first)
+            return false;
+
+        if (idx < key_size - 1)
+        {
+            // Check the value only if it's not the last node.  The last node
+            // may have an arbitrary value.
+            if (values[idx] != itr->second)
+                return false;
+        }
+    }
+
+    // At this point, the iterator should be at the end position.
+    if (itr != end)
+        return false;
+
+    // Check the keys and values again but go to the opposite direction.
+    do
+    {
+        --itr;
+        ++idx;
+
+        // key
+        if (keys[idx] != itr->first)
+            return false;
+
+        // value
+        if (idx < key_size - 1)
+        {
+            if (values[idx] != itr->second)
+                return false;
+        }
+    } while (itr != beg);
+
+    return true;
+}
+
+void fst_test_insert_search_mix()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int, int> db_type;
+    db_type db(0, 100, 0);
+
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 0, 0, 0, 100);
+    test_single_tree_search(db, 99, 0, 0, 100);
+
+    db.insert_front(0, 10, 1);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 0, 1, 0, 10);
+    test_single_tree_search(db, 5, 1, 0, 10);
+    test_single_tree_search(db, 9, 1, 0, 10);
+    test_single_tree_search(db, 10, 0, 10, 100);
+
+    db.insert_front(0, 100, 0);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 0, 0, 0, 100);
+    test_single_tree_search(db, 99, 0, 0, 100);
+
+    db.insert_front(10, 20, 5);
+    db.insert_front(30, 40, 5);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 10, 5, 10, 20);
+    test_single_tree_search(db, 20, 0, 20, 30);
+    test_single_tree_search(db, 30, 5, 30, 40);
+    test_single_tree_search(db, 40, 0, 40, 100);
+
+    db.insert_front(18, 22, 6);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 18, 6, 18, 22);
+    test_single_tree_search(db, 22, 0, 22, 30);
+    test_single_tree_search(db, 30, 5, 30, 40);
+
+    db.insert_front(19, 30, 5);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 19, 5, 19, 40);
+
+    db.insert_front(-100, 500, 999);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == db.leaf_size());
+    assert(db.is_tree_valid());
+    test_single_tree_search(db, 30, 999, 0, 100);
+}
+
+void fst_test_shift_left()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int, int> db_type;
+    db_type db(0, 100, 0);
+    db.insert_front(20, 40, 5);
+    db.insert_front(50, 60, 10);
+    db.insert_front(70, 80, 15);
+    build_and_dump(db);
+
+    // invalid segment ranges -- these should not modify the state of the
+    // tree, hence the tree should remain valid.
+    db.shift_left(5, 0);
+    assert(db.is_tree_valid());
+
+    db.shift_left(95, 120);
+    assert(db.is_tree_valid());
+
+    db.shift_left(105, 120);
+    assert(db.is_tree_valid());
+
+    db.shift_left(-10, -5);
+    assert(db.is_tree_valid());
+
+    db.shift_left(-10, 5);
+    assert(db.is_tree_valid());
+
+    // shift without removing nodes (including the lower bound).
+    db.shift_left(0, 5);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        std::vector<int> key_checks;
+        key_checks.push_back(0);
+        key_checks.push_back(15);
+        key_checks.push_back(35);
+        key_checks.push_back(45);
+        key_checks.push_back(55);
+        key_checks.push_back(65);
+        key_checks.push_back(75);
+        key_checks.push_back(100);
+        assert(db.verify_keys(key_checks));
+    }
+
+    // shift without removing nodes (not including the lower bound).
+    db.shift_left(1, 6);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        std::vector<int> key_checks;
+        key_checks.push_back(0);
+        key_checks.push_back(10);
+        key_checks.push_back(30);
+        key_checks.push_back(40);
+        key_checks.push_back(50);
+        key_checks.push_back(60);
+        key_checks.push_back(70);
+        key_checks.push_back(100);
+        assert(db.verify_keys(key_checks));
+    }
+
+    // shift without removing nodes (the upper bound of the removed segment
+    // coincides with a node).
+    db.shift_left(5, 10);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        std::vector<int> key_checks;
+        key_checks.push_back(0);
+        key_checks.push_back(5);
+        key_checks.push_back(25);
+        key_checks.push_back(35);
+        key_checks.push_back(45);
+        key_checks.push_back(55);
+        key_checks.push_back(65);
+        key_checks.push_back(100);
+        assert(db.verify_keys(key_checks));
+    }
+
+    // shift with one overlapping node.
+    db.shift_left(1, 11);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 1, 15, 25, 35, 45, 55, 100};
+        int vals[] = {0, 5, 0, 10, 0, 15, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // shift with two overlapping nodes.
+    db.shift_left(2, 30);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 1, 2, 7, 17, 27, 100};
+        int vals[] = {0, 5, 10, 0, 15, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // shift with both ends at existing nodes, but no nodes in between.
+    db.shift_left(0, 1);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 1, 6, 16, 26, 100};
+        int vals[] = {5, 10, 0, 15, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // shift with both ends at existing nodes, no nodes in between, and
+    // removing the segment results in two consecutive segments with identical
+    // value.  The segments should get combined into one.
+    db.shift_left(16, 26);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 1, 6, 100};
+        int vals[] = {5, 10, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // insert two new segments for the next test....
+    db.insert_front(10, 20, 400);
+    db.insert_front(30, 40, 400);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 1, 6, 10, 20, 30, 40, 100};
+        int vals[] = {5, 10, 0, 400, 0, 400, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // same test as the previous one, but the value of the combined segment
+    // differs from the value of the rightmost leaf node.
+    db.shift_left(20, 30);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 1, 6, 10, 30, 100};
+        int vals[] = {5, 10, 0, 400, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // remove all.
+    db.shift_left(0, 100);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+}
+
+void fst_test_shift_left_right_edge()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    flat_segment_tree<int, bool> db(0, 100, false);
+    build_and_dump(db);
+
+    // This should not change the tree state.
+    db.shift_left(2, 100);
+    build_and_dump(db);
+    {
+        int keys[] = {0, 100};
+        bool vals[] = {false};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    db.insert_front(20, 100, true);
+    build_and_dump(db);
+    {
+        int keys[] = {0, 20, 100};
+        bool vals[] = {false, true};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // This should insert a new segment at the end with the initial base value.
+    db.shift_left(80, 100);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 20, 80, 100};
+        bool vals[] = {false, true, false};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // This should not modify the tree since the removed segment already has
+    // the initial base value.
+    db.shift_left(85, 100);
+    assert(db.is_tree_valid()); // tree must still be valid.
+    build_and_dump(db);
+    {
+        int keys[] = {0, 20, 80, 100};
+        bool vals[] = {false, true, false};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Insert a new segment at the end with the value 'true' again...
+    db.insert_front(85, 100, true);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 20, 80, 85, 100};
+        bool vals[] = {false, true, false, true};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    db.shift_left(90, 95);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 20, 80, 85, 95, 100};
+        bool vals[] = {false, true, false, true, false};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+}
+
+void fst_test_shift_left_append_new_segment()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    flat_segment_tree<int, bool> db(0, 100, false);
+    db.insert_front(0, 100, true);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 100};
+        bool vals[] = {true};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    db.shift_left(10, 20);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 90, 100};
+        bool vals[] = {true, false};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    db.insert_front(0, 10, true);
+    db.insert_front(10, 20, false);
+    db.insert_front(20, 60, true);
+    db.insert_front(60, 80, false);
+    db.insert_front(80, 100, true);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 10, 20, 60, 80, 100};
+        bool vals[] = {true, false, true, false, true};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    db.shift_left(0, 70);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 10, 30, 100};
+        bool vals[] = {false, true, false};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+}
+
+void fst_test_shift_right_init0()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    flat_segment_tree<int, int> db(0, 100, 0);
+    db.insert_front(0, 10, 15);
+    db.insert_front(10, 20, 1);
+    db.insert_front(20, 30, 2);
+    db.insert_front(30, 40, 3);
+    db.insert_front(40, 50, 4);
+    db.insert_front(50, 60, 5);
+    db.insert_front(60, 70, 6);
+    db.insert_front(70, 80, 7);
+    db.insert_front(80, 90, 8);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+
+    // shifting position is at the lower bound.  The leftmost segment has a
+    // non-zero value which needs to be preserved after the shift by adding a
+    // new node.
+    db.shift_right(0, 5, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 5, 15, 25, 35, 45, 55, 65, 75, 85, 95, 100};
+        int vals[] = {0, 15, 1, 2, 3, 4, 5, 6, 7, 8, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // shifting position is at the lower bound, and after the shift, the upper
+    // bound of the last non-zero segment (10) becomes the upper bound of the
+    // global range.
+    db.shift_right(0, 5, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
+        int vals[] = {0, 15, 1, 2, 3, 4, 5, 6, 7, 8};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Shift by some odd number.
+    db.shift_right(0, 49, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 59, 69, 79, 89, 99, 100};
+        int vals[] = {0, 15, 1, 2, 3, 4};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Shift so that the 2nd node from the right-most node becomes the new
+    // right-most node.
+    db.shift_right(0, 11, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 70, 80, 90, 100};
+        int vals[] = {0, 15, 1, 2};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // This should remove all segments.
+    db.shift_right(0, 30, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 100};
+        int vals[] = {0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Insert a few new segments for the next series of tests...
+    db.insert_front(5, 10, 5);
+    db.insert_front(20, 30, 5);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 5, 10, 20, 30, 100};
+        int vals[] = {0, 5, 0, 5, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Inserting at a non-node position.  This should simply extend that
+    // segment and shift all the others.
+    db.shift_right(6, 20, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 5, 30, 40, 50, 100};
+        int vals[] = {0, 5, 0, 5, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Inserting at a node position.
+    db.shift_right(5, 20, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 25, 50, 60, 70, 100};
+        int vals[] = {0, 5, 0, 5, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Inserting at a non-node position, pushing a node out-of-bound.
+    db.shift_right(65, 40, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 25, 50, 60, 100};
+        int vals[] = {0, 5, 0, 5};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+
+    // Inserting at a node position, pushing a node out-of-bound.
+    db.shift_right(50, 40, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int keys[] = {0, 25, 90, 100};
+        int vals[] = {0, 5, 0};
+        assert(check_leaf_nodes(db, keys, vals, std::size(keys)));
+    }
+}
+
+void fst_test_shift_right_init999()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    // Initialize the tree with a default value of 999.
+    flat_segment_tree<int, int> db(0, 100, 999);
+    db.insert_front(0, 10, 0);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int k[] = {0, 10, 100};
+        int v[] = {0, 999};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // This should only extend the first segment.
+    db.shift_right(1, 10, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int k[] = {0, 20, 100};
+        int v[] = {0, 999};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // Inserting at the leftmost node position should create a new segment
+    // with a default value of 999.
+    db.shift_right(0, 10, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        int k[] = {0, 10, 30, 100};
+        int v[] = {999, 0, 999};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // Invalid shifts -- these should not invalidate the tree.
+    db.shift_right(-10, 10, false);
+    assert(db.is_tree_valid());
+
+    db.shift_right(100, 10, false);
+    assert(db.is_tree_valid());
+
+    db.shift_right(0, 0, false);
+    assert(db.is_tree_valid());
+}
+
+void fst_test_shift_right_bool()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    flat_segment_tree<long, bool> db(0, 1048576, false);
+    db.insert_front(3, 7, true);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        long k[] = {0, 3, 7, 1048576};
+        bool v[] = {false, true, false};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.shift_right(1, 1, false);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        long k[] = {0, 4, 8, 1048576};
+        bool v[] = {false, true, false};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+}
+
+void fst_test_shift_right_skip_start_node()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    flat_segment_tree<long, short> db(0, 1048576, 0);
+    db.insert_front(3, 7, 5);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        long k[] = {0, 3, 7, 1048576};
+        short v[] = {0, 5, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.shift_right(3, 2, true);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        long k[] = {0, 3, 9, 1048576};
+        short v[] = {0, 5, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // shift_right from the leftmost node should not change its value
+    db.insert_front(0, 4, 2);
+    assert(!db.is_tree_valid());
+    build_and_dump(db);
+    {
+        long k[] = {0, 4, 9, 1048576};
+        short v[] = {2, 5, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.shift_right(0, 2, true);
+    build_and_dump(db);
+    {
+        long k[] = {0, 6, 11, 1048576};
+        short v[] = {2, 5, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+}
+
+/**
+ * Right all nodes right so that all existing nodes get pushed out of the
+ * range.
+ */
+void fst_test_shift_right_all_nodes()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<unsigned, unsigned> fst_type;
+
+    fst_type db(0, 10, 0);
+    {
+        unsigned k[] = {0, 10};
+        unsigned v[] = {0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(0, 8, 2);
+    db.dump_leaf_nodes();
+    {
+        unsigned k[] = {0, 8, 10};
+        unsigned v[] = {2, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // Shift all nodes out of range.  After this, there should be only the
+    // left and right most nodes left.
+    db.shift_right(0, 15, false);
+    db.dump_leaf_nodes();
+    {
+        unsigned k[] = {0, 10};
+        unsigned v[] = {0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+}
+
+template<typename key_type, typename value_type>
+struct leaf_node_functor
+{
+    void operator()(const std::pair<key_type, value_type>&) const
+    {}
+};
+
+void fst_test_const_iterator()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    {
+        typedef unsigned int key_type;
+        typedef unsigned short value_type;
+        unsigned short max_value = std::numeric_limits<value_type>::max();
+        typedef flat_segment_tree<key_type, value_type> container_type;
+
+        container_type db(0, 1000, max_value);
+
+        build_and_dump(db);
+        {
+            unsigned int k[] = {0, 1000};
+            unsigned short v[] = {max_value};
+            assert(check_leaf_nodes(db, k, v, std::size(k)));
+        }
+
+        db.insert_front(10, 20, 10);
+        db.insert_front(20, 50, 20);
+        db.insert_front(100, 300, 55);
+        build_and_dump(db);
+        {
+            unsigned int k[] = {0, 10, 20, 50, 100, 300, 1000};
+            unsigned short v[] = {max_value, 10, 20, max_value, 55, max_value};
+            assert(check_leaf_nodes(db, k, v, std::size(k)));
+            fprintf(stdout, "fst_test_const_iterator:   leaf nodes valid\n");
+
+            // Check the forward iterator's integrity.
+            assert(is_iterator_valid(db.begin(), db.end(), k, v, std::size(k)));
+            fprintf(stdout, "fst_test_const_iterator:   forward iterator valid\n");
+
+            // Check the reverse iterator's integrity.
+            assert(is_iterator_valid(db.rbegin(), db.rend(), k, v, std::size(k)));
+            fprintf(stdout, "fst_test_const_iterator:   reverse iterator valid\n");
+        }
+
+        // Make sure it works with for_each.
+        std::for_each(db.begin(), db.end(), leaf_node_functor<key_type, value_type>());
+    }
+
+    {
+        typedef flat_segment_tree<int, bool> container_type;
+        container_type db(0, 100, true);
+        db.insert_front(0, 50, false);
+
+        {
+            cout << "-- forward" << endl;
+            container_type::const_iterator it = db.begin(), it_end = db.end();
+            // 0 -> 50 -> 100 -> end
+            cout << "key: " << it->first << "  value: " << it->second << endl;
+            assert(it->first == 0);
+            assert(it->second == false);
+            ++it;
+            cout << "key: " << it->first << "  value: " << it->second << endl;
+            assert(it->first == 50);
+            assert(it->second == true);
+            ++it;
+            cout << "key: " << it->first << "  value: " << it->second << endl;
+            assert(it->first == 100);
+            assert(it != it_end);
+            ++it;
+            assert(it == it_end);
+        }
+        {
+            cout << "-- reverse" << endl;
+            container_type::const_reverse_iterator it = db.rbegin(), it_end = db.rend();
+            // 100 -> 50 -> 0 -> end
+            cout << "key: " << it->first << "  value: " << it->second << endl;
+            assert(it->first == 100);
+            ++it;
+            cout << "key: " << it->first << "  value: " << it->second << endl;
+            assert(it->first == 50);
+            assert(it->second == true);
+            ++it;
+            cout << "key: " << it->first << "  value: " << it->second << endl;
+            assert(it->first == 0);
+            assert(it->second == false);
+            assert(it != it_end);
+            ++it;
+            assert(it == it_end);
+        }
+    }
+}
+
+template<typename key_type, typename value_type>
+void fst_test_insert_front_back(key_type start_key, key_type end_key, value_type default_value)
+{
+    MDDS_TEST_FUNC_SCOPE_MSG(
+        "start-key=" << start_key << "; end-key=" << end_key << "; default-value=" << default_value);
+
+    typedef flat_segment_tree<key_type, value_type> container_type;
+    typedef typename container_type::const_iterator itr_type;
+
+    value_type val = 0;
+
+    // insert a series of segments from the front.
+    container_type db_front(start_key, end_key, default_value);
+    for (key_type i = start_key; i < end_key - 10; ++i)
+    {
+        itr_type itr = db_front.insert_front(i, i + 1, val).first;
+        assert(itr->first == i);
+        assert(itr->second == val);
+        if (++val > 10)
+            val = 0;
+    }
+
+    // insert the same series of segments from the back.
+    container_type db_back(start_key, end_key, default_value);
+    val = 0;
+    for (key_type i = start_key; i < end_key - 10; ++i)
+    {
+        itr_type itr = db_back.insert_back(i, i + 1, val).first;
+        assert(itr->first == i);
+        assert(itr->second == val);
+        if (++val > 10)
+            val = 0;
+    }
+
+    // Now, these two must be identical.
+    if (db_front != db_back)
+    {
+        // They are not identical!
+        db_front.dump_leaf_nodes();
+        db_back.dump_leaf_nodes();
+        cout << "start_key = " << start_key << "  end_key = " << end_key << "  default_value = " << default_value
+             << endl;
+        assert(!"Contents of the two containers are not identical!");
+    }
+}
+
+void fst_perf_test_insert_front_back()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef unsigned long key_type;
+    typedef int value_type;
+    typedef flat_segment_tree<key_type, value_type> container_type;
+    key_type upper_bound = 20000;
+    {
+        stack_printer __stack_printer__("::fst_perf_test_insert (front insertion)");
+        container_type db(0, upper_bound, 0);
+        value_type val = 0;
+        for (key_type i = 0; i < upper_bound; ++i)
+        {
+            db.insert_front(i, i + 1, val);
+            if (++val > 10)
+                val = 0;
+        }
+    }
+
+    {
+        stack_printer __stack_printer__("::fst_perf_test_insert (back insertion)");
+        container_type db(0, upper_bound, 0);
+        value_type val = 0;
+        for (key_type i = 0; i < upper_bound; ++i)
+        {
+            db.insert_back(i, i + 1, val);
+            if (++val > 10)
+                val = 0;
+        }
+    }
+}
+
+void fst_test_copy_ctor()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef unsigned long key_type;
+    typedef int value_type;
+    typedef flat_segment_tree<key_type, value_type> fst;
+
+    // Test copy construction of node first.
+
+    {
+        // Original node.
+        fst::node_ptr node1(new fst::node);
+        node1->value_leaf.key = 10;
+        node1->value_leaf.value = 500;
+        assert(node1->is_leaf);
+        assert(!node1->parent);
+        assert(!node1->prev);
+        assert(!node1->next);
+
+        // Copy it to new node.
+        fst::node_ptr node2(new fst::node(*node1));
+        assert(node2->is_leaf);
+        assert(!node2->parent);
+        assert(!node2->prev);
+        assert(!node2->next);
+        assert(node2->value_leaf.key == 10);
+        assert(node2->value_leaf.value == 500);
+
+        // Changing the values of the original should not modify the second node.
+        node1->value_leaf.key = 35;
+        node1->value_leaf.value = 200;
+        assert(node2->value_leaf.key == 10);
+        assert(node2->value_leaf.value == 500);
+    }
+
+    {
+        // Test non-leaf node objects.
+        fst::nonleaf_node node1;
+        node1.value_nonleaf.low = 123;
+        node1.value_nonleaf.high = 789;
+
+        // Test the copying of non-leaf values.
+        fst::nonleaf_node node2(node1);
+        assert(!node2.is_leaf);
+        assert(!node2.parent);
+        assert(!node2.left);
+        assert(!node2.right);
+        assert(node2.value_nonleaf.low == 123);
+        assert(node2.value_nonleaf.high == 789);
+    }
+
+    // Now, test the copy construction of the flat_segment_tree.
+
+    // Simple copying by copy construction.
+    fst db(0, 100, 5);
+    fst db_copied(db);
+    assert(db == db_copied);
+    {
+        key_type k[] = {0, 100};
+        value_type v[] = {5};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // Inserting the same segment value to both instances.  They should still
+    // be equal.
+    db.insert_front(5, 10, 0);
+    db_copied.insert_front(5, 10, 0);
+    assert(db == db_copied);
+    {
+        key_type k[] = {0, 5, 10, 100};
+        value_type v[] = {5, 0, 5};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    // Inserting a new segment only to the 2nd instance.  They should differ.
+    db_copied.insert_front(15, 20, 35);
+    assert(db != db_copied);
+    {
+        key_type k[] = {0, 5, 10, 15, 20, 100};
+        value_type v[] = {5, 0, 5, 35, 5};
+        assert(check_leaf_nodes(db_copied, k, v, std::size(k)));
+    }
+
+    // Make sure that copying will leave the tree invalid.
+    assert(!db_copied.is_tree_valid());
+    db_copied.build_tree();
+    assert(db_copied.is_tree_valid());
+    fst db_copied_again(db_copied);
+    assert(db_copied == db_copied_again);
+    assert(!db_copied_again.is_tree_valid());
+    assert(!db_copied_again.get_root_node());
+
+    // Make sure we can still perform tree search correctly.
+    value_type answer = 0;
+    db_copied_again.build_tree();
+    db_copied_again.search_tree(18, answer);
+    assert(db_copied_again.is_tree_valid());
+    assert(answer == 35);
+}
+
+void fst_test_move_ctor()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    {
+        // initial condition (2 nodes)
+        using container_type = mdds::flat_segment_tree<int64_t, std::string>;
+        container_type src(-50, 50, "none");
+
+        // pointer to the root node should stay the same before and after the move.
+        auto src_root = src.get_root_node();
+
+        container_type moved(std::move(src));
+        assert(moved.min_key() == -50);
+        assert(moved.max_key() == 50);
+        assert(moved.default_value() == "none");
+        assert(moved.leaf_size() == 2);
+        assert(!moved.is_tree_valid());
+        assert(moved.get_root_node() == src_root);
+
+        moved.build_tree();
+        assert(moved.is_tree_valid());
+
+        {
+            // Make sure search_tree() won't access invalid memory
+            std::string v;
+            moved.search_tree(0, v);
+            assert(v == "none");
+        }
+
+        src_root = moved.get_root_node();
+
+        // move again with valid tree
+        container_type moved2(std::move(moved));
+        assert(moved2.min_key() == -50);
+        assert(moved2.max_key() == 50);
+        assert(moved2.default_value() == "none");
+        assert(moved2.leaf_size() == 2);
+        assert(moved2.is_tree_valid());
+        assert(src_root == moved2.get_root_node());
+
+        {
+            // Make sure search_tree() won't access invalid memory
+            std::string v;
+            moved2.search_tree(0, v);
+            assert(v == "none");
+        }
+    }
+
+    {
+        // 4 nodes
+        using container_type = mdds::flat_segment_tree<int64_t, std::string>;
+        container_type src(-50, 50, "none");
+        src.insert_back(-10, 10, "middle");
+
+        // pointer to the root node should stay the same before and after the move.
+        auto src_root = src.get_root_node();
+
+        container_type moved(std::move(src));
+        assert(moved.min_key() == -50);
+        assert(moved.max_key() == 50);
+        assert(moved.default_value() == "none");
+        assert(moved.leaf_size() == 4);
+        assert(!moved.is_tree_valid());
+        assert(moved.get_root_node() == src_root);
+
+        moved.build_tree();
+        assert(moved.is_tree_valid());
+
+        {
+            // Make sure search_tree() won't access invalid memory
+            std::string v;
+            moved.search_tree(-40, v);
+            assert(v == "none");
+
+            moved.search_tree(0, v);
+            assert(v == "middle");
+        }
+
+        src_root = moved.get_root_node();
+
+        // move again with valid tree
+        container_type moved2(std::move(moved));
+        assert(moved2.min_key() == -50);
+        assert(moved2.max_key() == 50);
+        assert(moved2.default_value() == "none");
+        assert(moved2.leaf_size() == 4);
+        assert(moved2.is_tree_valid());
+        assert(src_root == moved2.get_root_node());
+
+        {
+            // Make sure search_tree() won't access invalid memory
+            std::string v;
+            moved2.search_tree(-40, v);
+            assert(v == "none");
+
+            moved2.search_tree(0, v);
+            assert(v == "middle");
+        }
+    }
+}
+
+void fst_test_equality()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef unsigned long key_type;
+    typedef int value_type;
+    typedef flat_segment_tree<key_type, value_type> container_type;
+
+    container_type db1(0, 100, 0);
+    container_type db2(0, 100, 0);
+    assert(db1 == db2);
+
+    db1.insert_front(0, 1, 1);
+    assert(db1 != db2);
+
+    db2.insert_front(0, 1, 1);
+    assert(db1 == db2);
+
+    // Same node count, but with different value.
+    db2.insert_front(0, 1, 2);
+    assert(db1 != db2);
+
+    // Set the value back.
+    db2.insert_front(0, 1, 1);
+    assert(db1 == db2);
+
+    db1.insert_front(4, 10, 10);
+    db1.insert_front(4, 10, 0);
+    assert(db1 == db2);
+
+    db1.insert_front(20, 40, 5);
+    db1.insert_front(30, 35, 6);
+    assert(db1 != db2);
+
+    db2.insert_front(20, 30, 5);
+    db2.insert_front(30, 35, 6);
+    db2.insert_front(35, 40, 5);
+    assert(db1 == db2);
+}
+
+void fst_test_back_insert()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef unsigned int key_type;
+    typedef unsigned short value_type;
+    typedef flat_segment_tree<key_type, value_type> container_type;
+    container_type db(0, 100, 0);
+    db.insert_back(1, 2, 1);
+    {
+        unsigned int k[] = {0, 1, 2, 100};
+        unsigned short v[] = {0, 1, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(3, 4, 2);
+    {
+        unsigned int k[] = {0, 1, 2, 3, 4, 100};
+        unsigned short v[] = {0, 1, 0, 2, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(4, 5, 2);
+    {
+        unsigned int k[] = {0, 1, 2, 3, 5, 100};
+        unsigned short v[] = {0, 1, 0, 2, 0};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(90, 120, 10);
+    {
+        unsigned int k[] = {0, 1, 2, 3, 5, 90, 100};
+        unsigned short v[] = {0, 1, 0, 2, 0, 10};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(0, 10, 20);
+    {
+        unsigned int k[] = {0, 10, 90, 100};
+        unsigned short v[] = {20, 0, 10};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(5, 20, 20);
+    {
+        unsigned int k[] = {0, 20, 90, 100};
+        unsigned short v[] = {20, 0, 10};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(15, 30, 5);
+    {
+        unsigned int k[] = {0, 15, 30, 90, 100};
+        unsigned short v[] = {20, 5, 0, 10};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.insert_back(0, 1, 2);
+    {
+        unsigned int k[] = {0, 1, 15, 30, 90, 100};
+        unsigned short v[] = {2, 20, 5, 0, 10};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+
+    db.dump_leaf_nodes();
+}
+
+template<typename A, typename B>
+void print_iterator(typename flat_segment_tree<A, B>::const_iterator& itr)
+{
+    cout << "iterator: (key=" << itr->first << ",value=" << itr->second << ")" << endl;
+}
+
+void fst_test_insert_iterator()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef long key_type;
+    typedef short value_type;
+    typedef flat_segment_tree<key_type, value_type> db_type;
+
+    db_type db(0, 100, 0);
+    db_type::const_iterator itr;
+
+    itr = db.insert_front(0, 5, 4).first;
+    assert(itr->first == 0);
+    assert(itr->second == 4);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(3, 10, 100).first;
+    assert(itr->first == 3);
+    assert(itr->second == 100);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(5, 8, 100).first;
+    assert(itr->first == 3);
+    assert(itr->second == 100);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(5, 8, 50).first;
+    assert(itr->first == 5);
+    assert(itr->second == 50);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(6, 9, 50).first;
+    assert(itr->first == 5);
+    assert(itr->second == 50);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(9, 20, 24).first;
+    assert(itr->first == 9);
+    assert(itr->second == 24);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(19, 24, 34).first;
+    assert(itr->first == 19);
+    assert(itr->second == 34);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(24, 26, 0).first;
+    assert(itr->first == 24);
+    assert(itr->second == 0);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(30, 50, 2).first;
+    assert(itr->first == 30);
+    assert(itr->second == 2);
+    print_iterator<key_type, value_type>(itr);
+
+    itr = db.insert_front(120, 140, 34).first;
+    assert(itr == db.end());
+
+    itr = db.insert_front(-20, -10, 20).first;
+    assert(itr == db.end());
+}
+
+void fst_test_insert_state_changed()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef long key_type;
+    typedef short value_type;
+    typedef flat_segment_tree<key_type, value_type> db_type;
+    typedef std::pair<db_type::const_iterator, bool> ret_type;
+
+    db_type db(0, 1000, 0);
+
+    // Inserting a segment with the default value.  This should not change the
+    // state.
+    ret_type r = db.insert_front(10, 15, 0);
+    assert(!r.second);
+
+    // New segment with a different value.
+    r = db.insert_front(0, 10, 1);
+    assert(r.second);
+
+    // Inserting the same segment should not change the state.
+    r = db.insert_front(0, 10, 1);
+    assert(!r.second);
+
+    r = db.insert_front(0, 1, 1);
+    assert(!r.second);
+
+    r = db.insert_front(8, 10, 1);
+    assert(!r.second);
+
+    // This extends the segment, therefore the state should change.
+    r = db.insert_front(8, 11, 1);
+    assert(r.second);
+
+    r = db.insert_front(11, 15, 0);
+    assert(!r.second);
+
+    // This extends the segment.  At this point, 0 - 15 should have a value of 1.
+    r = db.insert_front(11, 15, 1);
+    assert(r.second);
+    {
+        db_type::const_iterator itr = r.first;
+        assert(itr->first == 0);
+        assert(itr->second == 1);
+        ++itr;
+        assert(itr->first == 15);
+    }
+
+    r = db.insert_front(2, 4, 1);
+    assert(!r.second);
+
+    // Different value segment.  This should change the state.
+    r = db.insert_front(2, 4, 0);
+    assert(r.second);
+
+    // Ditto.
+    r = db.insert_front(2, 4, 1);
+    assert(r.second);
+
+    r = db.insert_front(1, 8, 1);
+    assert(!r.second);
+
+    // Different value segment.
+    r = db.insert_front(1, 8, 2);
+    assert(r.second);
+
+    r = db.insert_front(8, 20, 2);
+    assert(r.second);
+
+    // The 0-1 segment should still have a value of 1.  So this won't change
+    // the state.
+    r = db.insert_front(0, 1, 1);
+    assert(!r.second);
+
+    // Partially out-of-bound segment, but this should modify the value of 0-2.
+    r = db.insert_front(-50, 2, 10);
+    assert(r.second);
+    {
+        db_type::const_iterator itr = r.first;
+        assert(itr->first == 0);
+        assert(itr->second == 10);
+        ++itr;
+        assert(itr->first == 2);
+    }
+
+    // Entirely out-of-bound.
+    r = db.insert_front(-50, -2, 20);
+    assert(!r.second);
+
+    // Likewise, partially out-of-bound at the higher end.
+    r = db.insert_front(800, 1200, 20);
+    assert(r.second);
+
+    // Entirely out-of-bound.
+    r = db.insert_front(1300, 1400, 25);
+    assert(!r.second);
+}
+
+void fst_perf_test_insert_position()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, bool> db_type;
+    typedef std::pair<db_type::const_iterator, bool> ret_type;
+    long upper = 60000;
+    {
+        stack_printer __stack_printer__("::fst_perf_test_insert_position (front)");
+        // Much smaller upper boundary because front insertion is very slow.
+        db_type db(0, upper, false);
+        bool val = false;
+        for (long i = 0; i < upper; ++i)
+        {
+            db.insert_front(i, i + 1, val);
+            val = !val;
+        }
+    }
+
+    {
+        stack_printer __stack_printer__("::fst_perf_test_insert_position (back)");
+        db_type db(0, upper, false);
+        bool val = false;
+        for (long i = 0; i < upper; ++i)
+        {
+            db.insert_back(i, i + 1, val);
+            val = !val;
+        }
+    }
+
+    {
+        db_type db(0, upper, false);
+        {
+            stack_printer __stack_printer__("::fst_perf_test_insert_position (position)");
+            db_type::const_iterator itr = db.begin();
+            bool val = false;
+            for (long i = 0; i < upper; ++i)
+            {
+                ret_type ret = db.insert(itr, i, i + 1, val);
+                val = !val;
+                itr = ret.first;
+            }
+        }
+        {
+            stack_printer __stack_printer__("::fst_perf_test_insert_position (position re-insert)");
+            db_type::const_iterator itr = db.begin();
+            bool val = true;
+            for (long i = 0; i < upper; ++i)
+            {
+                ret_type ret = db.insert(itr, i, i + 1, val);
+                val = !val;
+                itr = ret.first;
+            }
+        }
+    }
+}
+
+void fst_perf_test_position_search()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, bool> db_type;
+    typedef std::pair<db_type::const_iterator, bool> ret_type;
+    long upper = 60000;
+    db_type db(0, upper, false);
+
+    // Fill the leaf nodes first.
+    db_type::const_iterator itr = db.begin();
+    bool val = false;
+    for (long i = 0; i < upper; ++i)
+    {
+        ret_type ret = db.insert(itr, i, i + 1, val);
+        val = !val;
+        itr = ret.first;
+    }
+
+    {
+        stack_printer __stack_printer__("::fst_perf_test_position_search (normal)");
+        for (long i = 0; i < upper; ++i)
+        {
+            bool val2;
+            ret_type ret = db.search(i, val2);
+            assert(ret.second);
+        }
+    }
+
+    {
+        stack_printer __stack_printer__("::fst_perf_test_position_search (positioned)");
+        itr = db.begin();
+        for (long i = 0; i < upper; ++i)
+        {
+            bool val2;
+            ret_type ret = db.search(itr, i, val2);
+            assert(ret.second);
+            itr = ret.first;
+        }
+    }
+}
+
+template<typename K, typename V>
+bool check_pos_search_result(
+    const flat_segment_tree<K, V>& db, typename flat_segment_tree<K, V>::const_iterator& itr, K key, K start_expected,
+    K end_expected, V value_expected)
+{
+    typedef flat_segment_tree<K, V> db_type;
+    typedef std::pair<typename db_type::const_iterator, bool> ret_type;
+
+    V _val;
+    K _start = -1, _end = -1;
+
+    ret_type r = db.search(itr, key, _val, &_start, &_end);
+
+    cout << "expected: start=" << start_expected << " end=" << end_expected << " value=" << value_expected << endl;
+    cout << "observed: start=" << _start << " end=" << _end << " value=" << _val << endl;
+
+    bool result = _start == start_expected && _end == end_expected && _val == value_expected &&
+                  r.first->first == start_expected && r.first->second == value_expected;
+    itr = r.first;
+    return result;
+}
+
+void fst_test_position_search()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, short> db_type;
+    typedef std::pair<db_type::const_iterator, bool> ret_type;
+
+    db_type db(0, 100, 0);
+    db.insert_front(10, 20, 1);
+    db.insert_front(30, 50, 5);
+
+    db_type db2(-10, 10, 1);
+
+    struct
+    {
+        long start_range;
+        long end_range;
+        short value_expected;
+    } params[] = {{0, 10, 0}, {10, 20, 1}, {20, 30, 0}, {30, 50, 5}, {50, 100, 0}};
+
+    size_t n = std::size(params);
+
+    cout << "Testing for searches with various valid and invalid iterators." << endl;
+    for (size_t i = 0; i < n; ++i)
+    {
+        for (long j = params[i].start_range; j < params[i].end_range; ++j)
+        {
+            db_type::const_iterator itr;
+            bool success = false;
+
+            // empty iterator - should fall back to normal search.
+            success = check_pos_search_result(
+                db, itr, j, params[i].start_range, params[i].end_range, params[i].value_expected);
+            assert(success);
+
+            // iterator returned from the previous search.
+            success = check_pos_search_result(
+                db, itr, j, params[i].start_range, params[i].end_range, params[i].value_expected);
+            assert(success);
+
+            // begin iterator.
+            itr = db.begin();
+            success = check_pos_search_result(
+                db, itr, j, params[i].start_range, params[i].end_range, params[i].value_expected);
+            assert(success);
+
+            // end iterator.
+            itr = db.end();
+            success = check_pos_search_result(
+                db, itr, j, params[i].start_range, params[i].end_range, params[i].value_expected);
+            assert(success);
+
+            // iterator from another container - should fall back to normal search.
+            itr = db2.begin();
+            success = check_pos_search_result(
+                db, itr, j, params[i].start_range, params[i].end_range, params[i].value_expected);
+            assert(success);
+        }
+    }
+
+    cout << "Testing for continuous searching by re-using the iteraotr from the previous search." << endl;
+    db_type::const_iterator itr;
+    short val;
+    long start = 0, end = 0;
+
+    for (size_t i = 0; i < n; ++i)
+    {
+        ret_type r = db.search(itr, end, val, &start, &end);
+        assert(start == params[i].start_range);
+        assert(end == params[i].end_range);
+        assert(val == params[i].value_expected);
+        assert(r.second);
+        itr = r.first;
+    }
+}
+
+void fst_test_min_max_default()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, short> db_type;
+    db_type db(0, 100, 2);
+    assert(db.min_key() == 0);
+    assert(db.max_key() == 100);
+    assert(db.default_value() == 2);
+}
+
+void fst_test_swap()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, int> db_type;
+    db_type db1(0, 200, 20);
+    db_type db2(20, 40, 0);
+    db1.insert_back(20, 30, 1);
+    db1.insert_back(30, 40, 2);
+    db1.insert_back(40, 50, 3);
+    db1.build_tree();
+
+    // Check the content of db1.
+    {
+        db_type::key_type k[] = {0, 20, 30, 40, 50, 200};
+        db_type::value_type v[] = {20, 1, 2, 3, 20};
+        assert(check_leaf_nodes(db1, k, v, std::size(k)));
+    }
+    assert(db1.min_key() == 0);
+    assert(db1.max_key() == 200);
+    assert(db1.default_value() == 20);
+    assert(db1.is_tree_valid());
+
+    db1.swap(db2);
+
+    // Now db2 should inherit the content of db1.
+    {
+        db_type::key_type k[] = {0, 20, 30, 40, 50, 200};
+        db_type::value_type v[] = {20, 1, 2, 3, 20};
+        assert(check_leaf_nodes(db2, k, v, std::size(k)));
+    }
+    assert(db2.min_key() == 0);
+    assert(db2.max_key() == 200);
+    assert(db2.default_value() == 20);
+    assert(db2.is_tree_valid());
+
+    // Tree search should work on db2.
+    db_type::value_type val = 0;
+    assert(db2.search_tree(35, val).second);
+    assert(val == 2);
+}
+
+void fst_test_swap_tree_memory()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, int> db_type;
+    auto db1 = std::make_unique<db_type>(0, 100, 0);
+    db1->insert_back(10, 40, 999);
+    db1->build_tree();
+    int value = -1;
+    db1->search_tree(20, value);
+    assert(value == 999);
+
+    db_type db2(-10, 10, -99);
+    db2.swap(*db1);
+
+    db1.reset();
+
+    // Make sure that the tree is valid, and you can still search through the tree.
+    assert(db2.is_tree_valid());
+    value = -1;
+    db2.search_tree(20, value);
+    assert(value == 999);
+}
+
+void fst_test_clear()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, int> db_type;
+    db_type db(0, 100, 42);
+    db.insert_back(0, 10, 0);
+    db.insert_back(10, 20, 1);
+    db.insert_back(20, 30, 2);
+    db.build_tree();
+
+    {
+        db_type::key_type k[] = {0, 10, 20, 30, 100};
+        db_type::value_type v[] = {0, 1, 2, 42};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+    assert(db.min_key() == 0);
+    assert(db.max_key() == 100);
+    assert(db.default_value() == 42);
+    assert(db.is_tree_valid());
+
+    db.clear();
+
+    {
+        db_type::key_type k[] = {0, 100};
+        db_type::value_type v[] = {42};
+        assert(check_leaf_nodes(db, k, v, std::size(k)));
+    }
+    assert(db.min_key() == 0);
+    assert(db.max_key() == 100);
+    assert(db.default_value() == 42);
+    assert(!db.is_tree_valid());
+}
+
+void fst_test_assignment()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<long, int> db_type;
+    db_type db1(0, 100, 42);
+    db1.insert_back(0, 10, 0);
+    db1.insert_back(10, 20, 1);
+    db1.insert_back(20, 30, 2);
+    db1.build_tree();
+
+    {
+        db_type::key_type k[] = {0, 10, 20, 30, 100};
+        db_type::value_type v[] = {0, 1, 2, 42};
+        assert(check_leaf_nodes(db1, k, v, std::size(k)));
+    }
+    assert(db1.min_key() == 0);
+    assert(db1.max_key() == 100);
+    assert(db1.default_value() == 42);
+    assert(db1.is_tree_valid());
+
+    db_type db2(20, 40, 0);
+    db2.insert_back(20, 30, 8);
+    db2.build_tree();
+
+    {
+        db_type::key_type k[] = {20, 30, 40};
+        db_type::value_type v[] = {8, 0};
+        assert(check_leaf_nodes(db2, k, v, std::size(k)));
+    }
+    assert(db2.min_key() == 20);
+    assert(db2.max_key() == 40);
+    assert(db2.default_value() == 0);
+    assert(db2.is_tree_valid());
+
+    db_type db3(10, 80, 4);
+    db3.build_tree();
+
+    {
+        db_type::key_type k[] = {10, 80};
+        db_type::value_type v[] = {4};
+        assert(check_leaf_nodes(db3, k, v, std::size(k)));
+    }
+    assert(db3.min_key() == 10);
+    assert(db3.max_key() == 80);
+    assert(db3.default_value() == 4);
+    assert(db3.is_tree_valid());
+
+    db3 = db2 = db1;
+
+    {
+        db_type::key_type k[] = {0, 10, 20, 30, 100};
+        db_type::value_type v[] = {0, 1, 2, 42};
+        assert(check_leaf_nodes(db1, k, v, std::size(k)));
+    }
+    assert(db1.min_key() == 0);
+    assert(db1.max_key() == 100);
+    assert(db1.default_value() == 42);
+    assert(db1.is_tree_valid());
+
+    {
+        db_type::key_type k[] = {0, 10, 20, 30, 100};
+        db_type::value_type v[] = {0, 1, 2, 42};
+        assert(check_leaf_nodes(db2, k, v, std::size(k)));
+    }
+    assert(db2.min_key() == 0);
+    assert(db2.max_key() == 100);
+    assert(db2.default_value() == 42);
+    assert(!db2.is_tree_valid());
+
+    {
+        db_type::key_type k[] = {0, 10, 20, 30, 100};
+        db_type::value_type v[] = {0, 1, 2, 42};
+        assert(check_leaf_nodes(db3, k, v, std::size(k)));
+    }
+    assert(db3.min_key() == 0);
+    assert(db3.max_key() == 100);
+    assert(db3.default_value() == 42);
+    assert(!db3.is_tree_valid());
+}
+
+void fst_test_move_assignment()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    using container_type = flat_segment_tree<uint32_t, std::string>;
+    container_type src{0, 100, "base"};
+    container_type moved{10, 200, "base2"};
+    moved = std::move(src);
+
+    assert(moved.min_key() == 0);
+    assert(moved.max_key() == 100);
+    assert(moved.default_value() == "base");
+    assert(moved.leaf_size() == 2);
+    assert(!moved.is_tree_valid());
+
+    moved.insert_back(10, 25, "10-25");
+    moved.build_tree();
+    assert(moved.is_tree_valid());
+    assert(moved.leaf_size() == 4);
+
+    container_type moved2{30, 450, "base3"};
+    moved2 = std::move(moved);
+    assert(moved2.min_key() == 0);
+    assert(moved2.max_key() == 100);
+    assert(moved2.default_value() == "base");
+    assert(moved2.leaf_size() == 4);
+    assert(moved2.is_tree_valid());
+
+    // Make sure we can perform tree search.
+    std::string v;
+    uint32_t key1, key2;
+    auto res = moved2.search_tree(20, v, &key1, &key2);
+    assert(res.second);
+    assert(v == "10-25");
+    assert(key1 == 10);
+    assert(key2 == 25);
+}
+
+void fst_test_non_numeric_value()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int, std::string> db_type;
+    db_type db(0, 4, "42");
+    db.insert_back(1, 2, "hello world");
+
+    assert(db.default_value() == "42");
+
+    std::string result;
+    db.search(1, result);
+
+    assert(result == "hello world");
+
+    db_type db2(db);
+
+    assert(db == db2);
+}
+
+void fst_test_insert_out_of_bound()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int, bool> db_type;
+    db_type db(0, 10, false);
+
+    // An out-of-bound range, whether it's in part or in its entirety, should
+    // be handled gracefully without throwing exceptions or causing segfaults.
+
+    // ranges that are entirely out-of-bound.
+
+    auto ret = db.insert_front(-10, -8, false);
+    assert(!ret.second);
+    db.insert_back(12, 13, false);
+    assert(!ret.second);
+
+    db_type::const_iterator pos = db.end();
+
+    ret = db.insert(pos, -10, -8, false);
+    assert(!ret.second);
+    pos = ret.first;
+
+    ret = db.insert(pos, 12, 13, false);
+    assert(!ret.second);
+    pos = ret.first;
+
+    // partial overflows.
+
+    ret = db.insert(pos, -2, 2, true);
+    assert(ret.second); // content modified
+    pos = ret.first;
+
+    ret = db.insert(pos, 8, 20, true);
+    assert(ret.second); // content modified
+    pos = ret.first;
+}
+
+void fst_test_insert_out_of_bound_2()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int, bool> db_type;
+    db_type db(0, 256, false);
+
+    // The range is entirely out-of-bound, but the start range equals the
+    // upper bound of the valid range.
+    auto ret = db.insert_back(256, 1024, true);
+
+    // Insertion never took place.
+    assert(ret.first == db.end());
+    assert(!ret.second);
+}
+
+void fst_test_segment_iterator()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    typedef flat_segment_tree<int16_t, bool> db_type;
+    db_type db(0, 100, false);
+
+    db_type::const_segment_iterator it = db.begin_segment();
+    db_type::const_segment_iterator ite = db.end_segment();
+
+    assert(it != ite);
+    assert(it->start == 0);
+    assert(it->end == 100);
+    assert(it->value == false);
+
+    const auto& v = *it;
+    assert(v.start == 0);
+    assert(v.end == 100);
+    assert(v.value == false);
+
+    ++it;
+    assert(it == ite);
+
+    --it;
+    assert(it != ite);
+    assert(it->start == 0);
+    assert(it->end == 100);
+    assert(it->value == false);
+
+    db_type::const_segment_iterator it2; // default constructor
+    it2 = it; // assignment operator
+    assert(it2 == it);
+    assert(it2->start == 0);
+    assert(it2->end == 100);
+    assert(it2->value == false);
+
+    auto it3(it2); // copy constructor
+    assert(it3 == it2);
+    assert(it3->start == 0);
+    assert(it3->end == 100);
+    assert(it3->value == false);
+
+    db.insert_back(20, 50, true); // this invalidates the iterators.
+
+    it = db.begin_segment();
+    ite = db.end_segment();
+
+    assert(it->start == 0);
+    assert(it->end == 20);
+    assert(it->value == false);
+
+    it2 = it++; // post-increment
+
+    assert(it2->start == 0);
+    assert(it2->end == 20);
+    assert(it2->value == false);
+
+    assert(it->start == 20);
+    assert(it->end == 50);
+    assert(it->value == true);
+
+    ++it;
+    assert(it->start == 50);
+    assert(it->end == 100);
+    assert(it->value == false);
+
+    ++it;
+    assert(it == ite);
+
+    it2 = it--; // post-decrement.
+    assert(it2 == ite);
+
+    it = db.begin_segment();
+    auto it_moved{std::move(it)}; // move construction
+
+    assert(it_moved->start == 0);
+    assert(it_moved->end == 20);
+    assert(it_moved->value == false);
+}
+
+void fst_test_segment_range()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    using container_type = mdds::flat_segment_tree<int32_t, std::string>;
+    using node_type = container_type::const_segment_iterator::value_type;
+
+    {
+        container_type db{0, 100, "-"};
+
+        const std::vector<node_type> expected = {
+            {0, 100, "-"},
+        };
+
+        std::cout << "--" << std::endl;
+
+        std::vector<node_type> actual;
+        for (const node_type& v : db.segment_range())
+        {
+            std::cout << "start=" << v.start << "; end=" << v.end << "; value='" << v.value << "'" << std::endl;
+            actual.push_back(v);
+        }
+
+        assert(expected == actual);
+    }
+
+    {
+        container_type db{0, 100, "-"};
+        db.insert_back(10, 25, "10-25");
+
+        const std::vector<node_type> expected = {
+            {0, 10, "-"},
+            {10, 25, "10-25"},
+            {25, 100, "-"},
+        };
+
+        std::cout << "--" << std::endl;
+
+        std::vector<node_type> actual;
+        for (const node_type& v : db.segment_range())
+        {
+            std::cout << "start=" << v.start << "; end=" << v.end << "; value='" << v.value << "'" << std::endl;
+            actual.push_back(v);
+        }
+
+        assert(expected == actual);
+
+        // Use it with structured binding
+        std::cout << "--" << std::endl;
+        actual.clear();
+        for (const auto& [start, end, value] : db.segment_range())
+        {
+            std::cout << "start=" << start << "; end=" << end << "; value='" << value << "'" << std::endl;
+            actual.emplace_back(start, end, value);
+        }
+
+        assert(expected == actual);
+    }
+}
+
+class custom_key_type
+{
+    long value;
+
+public:
+    custom_key_type() : value(0)
+    {}
+    custom_key_type(const std::string& src) : value(std::stol(src))
+    {}
+
+    bool operator==(const custom_key_type& other) const
+    {
+        return value == other.value;
+    }
+
+    bool operator!=(const custom_key_type& other) const
+    {
+        return !operator==(other);
+    }
+
+    bool operator<(const custom_key_type& other) const
+    {
+        return value < other.value;
+    }
+
+    bool operator<=(const custom_key_type& other) const
+    {
+        return value <= other.value;
+    }
+
+#if 0 // intentionally not implementing these operators
+    bool operator>(const custom_key_type& other) const
+    {
+        return value > other.value;
+    }
+
+    bool operator>=(const custom_key_type& other) const
+    {
+        return value >= other.value;
+    }
+#endif
+};
+
+void fst_test_custom_key_type()
+{
+    MDDS_TEST_FUNC_SCOPE;
+
+    using container_type = mdds::flat_segment_tree<custom_key_type, std::string>;
+    using node_type = container_type::const_segment_iterator::value_type;
+
+    container_type db(custom_key_type{"0"}, custom_key_type{"123"}, "-");
+
+    db.insert_back(custom_key_type{"10"}, custom_key_type{"45"}, "10-45");
+
+    const std::vector<node_type> expected = {
+        {custom_key_type{"0"}, custom_key_type{"10"}, "-"},
+        {custom_key_type{"10"}, custom_key_type{"45"}, "10-45"},
+        {custom_key_type{"45"}, custom_key_type{"123"}, "-"},
+    };
+
+    std::vector<node_type> actual;
+
+    for (const node_type& v : db.segment_range())
+        actual.push_back(v);
+
+    assert(expected == actual);
+}
+
+int main(int argc, char** argv)
+{
+    try
+    {
+        cmd_options opt;
+        if (!parse_cmd_options(argc, argv, opt))
+            return EXIT_FAILURE;
+
+        if (opt.test_func)
+        {
+            fst_test_equality();
+            fst_test_copy_ctor();
+            fst_test_move_ctor();
+            fst_test_back_insert();
+            {
+                typedef unsigned int key_type;
+                typedef unsigned short value_type;
+                for (value_type i = 0; i <= 100; ++i)
+                    fst_test_insert_front_back<key_type, value_type>(0, 100, i);
+            }
+
+            {
+                typedef int key_type;
+                typedef short value_type;
+                for (value_type i = 0; i <= 100; ++i)
+                    fst_test_insert_front_back<key_type, value_type>(0, 100, i);
+            }
+
+            {
+                typedef long key_type;
+                typedef unsigned int value_type;
+                for (value_type i = 0; i <= 100; ++i)
+                    fst_test_insert_front_back<key_type, value_type>(0, 100, i);
+            }
+
+            fst_test_leaf_search();
+            fst_test_leaf_search_2();
+            fst_test_tree_build();
+            fst_test_tree_search();
+            fst_test_tree_search_2();
+            fst_test_insert_search_mix();
+            fst_test_shift_left();
+            fst_test_shift_left_right_edge();
+            fst_test_shift_left_append_new_segment();
+            fst_test_shift_right_init0();
+            fst_test_shift_right_init999();
+            fst_test_shift_right_bool();
+            fst_test_shift_right_skip_start_node();
+            fst_test_shift_right_all_nodes();
+            fst_test_const_iterator();
+            fst_test_insert_iterator();
+            fst_test_insert_state_changed();
+            fst_test_position_search();
+            fst_test_min_max_default();
+            fst_test_swap();
+            fst_test_swap_tree_memory();
+            fst_test_clear();
+            fst_test_assignment();
+            fst_test_move_assignment();
+            fst_test_non_numeric_value();
+            fst_test_insert_out_of_bound();
+            fst_test_insert_out_of_bound_2();
+            fst_test_segment_iterator();
+            fst_test_segment_range();
+            fst_test_custom_key_type();
+        }
+
+        if (opt.test_perf)
+        {
+            fst_perf_test_search_leaf();
+            fst_perf_test_search_tree();
+            fst_perf_test_insert_front_back();
+            fst_perf_test_insert_position();
+            fst_perf_test_position_search();
+        }
+    }
+    catch (const std::exception& e)
+    {
+        fprintf(stdout, "Test failed: %s\n", e.what());
+        return EXIT_FAILURE;
+    }
+
+    fprintf(stdout, "Test finished successfully!\n");
+    return 0;
+}
diff --git a/test/gdb/Makefile.am b/test/gdb/Makefile.am
new file mode 100644
index 0000000..555e093
--- /dev/null
+++ b/test/gdb/Makefile.am
@@ -0,0 +1,14 @@
+## Process this file with automake to produce Makefile.in
+
+SUBDIRS = src
+
+AUTOMAKE_OPTIONS = dejagnu
+
+CLEANFILES = *.log *.sum
+
+RUNTEST = $(RUNTEST_BIN)
+AM_RUNTESTFLAGS = BINFILE=src/test GDB=$(GDB)
+
+export PYTHONPATH=$(top_srcdir)/misc/gdb
+
+## vim: set shiftwidth=4 tabstop=4 noexpandtab:
diff --git a/test/gdb/Makefile.in b/test/gdb/Makefile.in
new file mode 100644
index 0000000..b8df454
--- /dev/null
+++ b/test/gdb/Makefile.in
@@ -0,0 +1,688 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+subdir = test/gdb
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_compile_stdcxx.m4 \
+	$(top_srcdir)/m4/ax_cxx_compile_stdcxx_17.m4 \
+	$(top_srcdir)/m4/m4_ax_valgrind_check.m4 \
+	$(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
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+CONFIG_CLEAN_VPATH_FILES =
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+am__v_P_0 = false
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+am__v_GEN_ = $(am__v_GEN_@AM_DEFAULT_V@)
+am__v_GEN_0 = @echo "  GEN     " $@;
+am__v_GEN_1 = 
+AM_V_at = $(am__v_at_@AM_V@)
+am__v_at_ = $(am__v_at_@AM_DEFAULT_V@)
+am__v_at_0 = @
+am__v_at_1 = 
+SOURCES =
+DIST_SOURCES =
+RECURSIVE_TARGETS = all-recursive check-recursive cscopelist-recursive \
+	ctags-recursive dvi-recursive html-recursive info-recursive \
+	install-data-recursive install-dvi-recursive \
+	install-exec-recursive install-html-recursive \
+	install-info-recursive install-pdf-recursive \
+	install-ps-recursive install-recursive installcheck-recursive \
+	installdirs-recursive pdf-recursive ps-recursive \
+	tags-recursive uninstall-recursive
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
+    *) (install-info --version) >/dev/null 2>&1;; \
+  esac
+RECURSIVE_CLEAN_TARGETS = mostlyclean-recursive clean-recursive	\
+  distclean-recursive maintainer-clean-recursive
+am__recursive_targets = \
+  $(RECURSIVE_TARGETS) \
+  $(RECURSIVE_CLEAN_TARGETS) \
+  $(am__extra_recursive_targets)
+AM_RECURSIVE_TARGETS = $(am__recursive_targets:-recursive=) TAGS CTAGS \
+	distdir distdir-am
+am__extra_recursive_targets = check-valgrind-recursive \
+	check-valgrind-memcheck-recursive \
+	check-valgrind-helgrind-recursive check-valgrind-drd-recursive \
+	check-valgrind-sgcheck-recursive
+am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) $(LISP)
+# Read a list of newline-separated strings from the standard input,
+# and print each of them once, without duplicates.  Input order is
+# *not* preserved.
+am__uniquify_input = $(AWK) '\
+  BEGIN { nonempty = 0; } \
+  { items[$$0] = 1; nonempty = 1; } \
+  END { if (nonempty) { for (i in items) print i; }; } \
+'
+# Make sure the list of sources is unique.  This is necessary because,
+# e.g., the same source file might be shared among _SOURCES variables
+# for different programs/libraries.
+am__define_uniq_tagged_files = \
+  list='$(am__tagged_files)'; \
+  unique=`for i in $$list; do \
+    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+  done | $(am__uniquify_input)`
+DEJATOOL = $(PACKAGE)
+RUNTESTDEFAULTFLAGS = --tool $$tool --srcdir $$srcdir
+DIST_SUBDIRS = $(SUBDIRS)
+am__DIST_COMMON = $(srcdir)/Makefile.in
+DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
+am__relativize = \
+  dir0=`pwd`; \
+  sed_first='s,^\([^/]*\)/.*$$,\1,'; \
+  sed_rest='s,^[^/]*/*,,'; \
+  sed_last='s,^.*/\([^/]*\)$$,\1,'; \
+  sed_butlast='s,/*[^/]*$$,,'; \
+  while test -n "$$dir1"; do \
+    first=`echo "$$dir1" | sed -e "$$sed_first"`; \
+    if test "$$first" != "."; then \
+      if test "$$first" = ".."; then \
+        dir2=`echo "$$dir0" | sed -e "$$sed_last"`/"$$dir2"; \
+        dir0=`echo "$$dir0" | sed -e "$$sed_butlast"`; \
+      else \
+        first2=`echo "$$dir2" | sed -e "$$sed_first"`; \
+        if test "$$first2" = "$$first"; then \
+          dir2=`echo "$$dir2" | sed -e "$$sed_rest"`; \
+        else \
+          dir2="../$$dir2"; \
+        fi; \
+        dir0="$$dir0"/"$$first"; \
+      fi; \
+    fi; \
+    dir1=`echo "$$dir1" | sed -e "$$sed_rest"`; \
+  done; \
+  reldir="$$dir2"
+ACLOCAL = @ACLOCAL@
+AMTAR = @AMTAR@
+AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
+API_VERSION = @API_VERSION@
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+CC = @CC@
+CCDEPMODE = @CCDEPMODE@
+CFLAGS = @CFLAGS@
+CPPFLAGS = @CPPFLAGS@
+CPPFLAGS_NODEBUG = @CPPFLAGS_NODEBUG@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
+CXX = @CXX@
+CXXDEPMODE = @CXXDEPMODE@
+CXXFLAGS = @CXXFLAGS@
+CXXFLAGS_UNITTESTS = @CXXFLAGS_UNITTESTS@
+CYGPATH_W = @CYGPATH_W@
+DEFS = @DEFS@
+DEPDIR = @DEPDIR@
+DOXYGEN = @DOXYGEN@
+ECHO_C = @ECHO_C@
+ECHO_N = @ECHO_N@
+ECHO_T = @ECHO_T@
+ENABLE_VALGRIND_drd = @ENABLE_VALGRIND_drd@
+ENABLE_VALGRIND_helgrind = @ENABLE_VALGRIND_helgrind@
+ENABLE_VALGRIND_memcheck = @ENABLE_VALGRIND_memcheck@
+ENABLE_VALGRIND_sgcheck = @ENABLE_VALGRIND_sgcheck@
+ETAGS = @ETAGS@
+EXEEXT = @EXEEXT@
+EXPECT = @EXPECT@
+GDB = @GDB@
+HAVE_CXX17 = @HAVE_CXX17@
+INCDIR = @INCDIR@
+INSTALL = @INSTALL@
+INSTALL_DATA = @INSTALL_DATA@
+INSTALL_PROGRAM = @INSTALL_PROGRAM@
+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+LDFLAGS = @LDFLAGS@
+LIBOBJS = @LIBOBJS@
+LIBS = @LIBS@
+LTLIBOBJS = @LTLIBOBJS@
+MAINT = @MAINT@
+MAKEINFO = @MAKEINFO@
+MISCDIR = @MISCDIR@
+MKDIR_P = @MKDIR_P@
+OBJDIR = @OBJDIR@
+OBJEXT = @OBJEXT@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+QUICKCHECKDIR = @QUICKCHECKDIR@
+RUNTEST_BIN = @RUNTEST_BIN@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SPHINX = @SPHINX@
+STRIP = @STRIP@
+VALGRIND = @VALGRIND@
+VALGRIND_ENABLED = @VALGRIND_ENABLED@
+VERSION = @VERSION@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_CXX = @ac_ct_CXX@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build_alias = @build_alias@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host_alias = @host_alias@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+valgrind_enabled_tools = @valgrind_enabled_tools@
+valgrind_tools = @valgrind_tools@
+SUBDIRS = src
+AUTOMAKE_OPTIONS = dejagnu
+CLEANFILES = *.log *.sum
+RUNTEST = $(RUNTEST_BIN)
+AM_RUNTESTFLAGS = BINFILE=src/test GDB=$(GDB)
+all: all-recursive
+
+.SUFFIXES:
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/gdb/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/gdb/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+# This directory's subdirectories are mostly independent; you can cd
+# into them and run 'make' without going through this Makefile.
+# To change the values of 'make' variables: instead of editing Makefiles,
+# (1) if the variable is set in 'config.status', edit 'config.status'
+#     (which will cause the Makefiles to be regenerated when you run 'make');
+# (2) otherwise, pass the desired values on the 'make' command line.
+$(am__recursive_targets):
+	@fail=; \
+	if $(am__make_keepgoing); then \
+	  failcom='fail=yes'; \
+	else \
+	  failcom='exit 1'; \
+	fi; \
+	dot_seen=no; \
+	target=`echo $@ | sed s/-recursive//`; \
+	case "$@" in \
+	  distclean-* | maintainer-clean-*) list='$(DIST_SUBDIRS)' ;; \
+	  *) list='$(SUBDIRS)' ;; \
+	esac; \
+	for subdir in $$list; do \
+	  echo "Making $$target in $$subdir"; \
+	  if test "$$subdir" = "."; then \
+	    dot_seen=yes; \
+	    local_target="$$target-am"; \
+	  else \
+	    local_target="$$target"; \
+	  fi; \
+	  ($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
+	  || eval $$failcom; \
+	done; \
+	if test "$$dot_seen" = "no"; then \
+	  $(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
+	fi; test -z "$$fail"
+check-valgrind-local: 
+check-valgrind-memcheck-local: 
+check-valgrind-helgrind-local: 
+check-valgrind-drd-local: 
+check-valgrind-sgcheck-local: 
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-recursive
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	if ($(ETAGS) --etags-include --version) >/dev/null 2>&1; then \
+	  include_option=--etags-include; \
+	  empty_fix=.; \
+	else \
+	  include_option=--include; \
+	  empty_fix=; \
+	fi; \
+	list='$(SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    test ! -f $$subdir/TAGS || \
+	      set "$$@" "$$include_option=$$here/$$subdir/TAGS"; \
+	  fi; \
+	done; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-recursive
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-recursive
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+check-DEJAGNU: site.exp
+	srcdir='$(srcdir)'; export srcdir; \
+	EXPECT=$(EXPECT); export EXPECT; \
+	if $(SHELL) -c "$(RUNTEST) --version" > /dev/null 2>&1; then \
+	  exit_status=0; l='$(DEJATOOL)'; for tool in $$l; do \
+	    if $(RUNTEST) $(RUNTESTDEFAULTFLAGS) $(AM_RUNTESTFLAGS) $(RUNTESTFLAGS); \
+	    then :; else exit_status=1; fi; \
+	  done; \
+	else echo "WARNING: could not find '$(RUNTEST)'" 1>&2; :;\
+	fi; \
+	exit $$exit_status
+site.exp: Makefile $(EXTRA_DEJAGNU_SITE_CONFIG)
+	@echo 'Making a new site.exp file ...'
+	@echo '## these variables are automatically generated by make ##' >site.tmp
+	@echo '# Do not edit here.  If you wish to override these values' >>site.tmp
+	@echo '# edit the last section' >>site.tmp
+	@echo 'set srcdir "$(srcdir)"' >>site.tmp
+	@echo "set objdir \"`pwd`\"" >>site.tmp
+	@list='$(EXTRA_DEJAGNU_SITE_CONFIG)'; for f in $$list; do \
+	  echo "## Begin content included from file $$f.  Do not modify. ##" \
+	   && cat `test -f "$$f" || echo '$(srcdir)/'`$$f \
+	   && echo "## End content included from file $$f. ##" \
+	   || exit 1; \
+	 done >> site.tmp
+	@echo "## End of auto-generated content; you can edit from here. ##" >> site.tmp
+	@if test -f site.exp; then \
+	   sed -e '1,/^## End of auto-generated content.*##/d' site.exp >> site.tmp; \
+	 fi
+	@-rm -f site.bak
+	@test ! -f site.exp || mv site.exp site.bak
+	@mv site.tmp site.exp
+
+distclean-DEJAGNU:
+	-rm -f site.exp site.bak
+	-l='$(DEJATOOL)'; for tool in $$l; do \
+	  rm -f $$tool.sum $$tool.log; \
+	done
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
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+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
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+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+mostlyclean-generic:
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+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
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+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+maintainer-clean-generic:
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new file mode 100644
index 0000000..5088c6e
--- /dev/null
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+	flat_segment_tree.cpp \
+	multi_type_matrix.cpp \
+	multi_type_vector.cpp \
+	point_quad_tree.cpp \
+	rtree.cpp \
+	segment_tree.cpp \
+	sorted_string_map.cpp \
+	test.cpp \
+	trie_map.cpp
diff --git a/test/gdb/src/Makefile.in b/test/gdb/src/Makefile.in
new file mode 100644
index 0000000..84cc213
--- /dev/null
+++ b/test/gdb/src/Makefile.in
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+# This program is distributed in the hope that it will be useful,
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -c -o test-trie_map.o `test -f 'trie_map.cpp' || echo '$(srcdir)/'`trie_map.cpp
+
+test-trie_map.obj: trie_map.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test-trie_map.obj -MD -MP -MF $(DEPDIR)/test-trie_map.Tpo -c -o test-trie_map.obj `if test -f 'trie_map.cpp'; then $(CYGPATH_W) 'trie_map.cpp'; else $(CYGPATH_W) '$(srcdir)/trie_map.cpp'; fi`
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/test-trie_map.Tpo $(DEPDIR)/test-trie_map.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='trie_map.cpp' object='test-trie_map.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -c -o test-trie_map.obj `if test -f 'trie_map.cpp'; then $(CYGPATH_W) 'trie_map.cpp'; else $(CYGPATH_W) '$(srcdir)/trie_map.cpp'; fi`
+check-valgrind-local: 
+check-valgrind-memcheck-local: 
+check-valgrind-helgrind-local: 
+check-valgrind-drd-local: 
+check-valgrind-sgcheck-local: 
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+check-valgrind: check-valgrind-am
+
+check-valgrind-am: check-valgrind-local
+
+check-valgrind-drd: check-valgrind-drd-am
+
+check-valgrind-drd-am: check-valgrind-drd-local
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+check-valgrind-helgrind: check-valgrind-helgrind-am
+
+check-valgrind-helgrind-am: check-valgrind-helgrind-local
+
+check-valgrind-memcheck: check-valgrind-memcheck-am
+
+check-valgrind-memcheck-am: check-valgrind-memcheck-local
+
+check-valgrind-sgcheck: check-valgrind-sgcheck-am
+
+check-valgrind-sgcheck-am: check-valgrind-sgcheck-local
+
+clean: clean-am
+
+clean-am: clean-checkPROGRAMS clean-generic mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/test-flat_segment_tree.Po
+	-rm -f ./$(DEPDIR)/test-multi_type_matrix.Po
+	-rm -f ./$(DEPDIR)/test-multi_type_vector.Po
+	-rm -f ./$(DEPDIR)/test-point_quad_tree.Po
+	-rm -f ./$(DEPDIR)/test-rtree.Po
+	-rm -f ./$(DEPDIR)/test-segment_tree.Po
+	-rm -f ./$(DEPDIR)/test-sorted_string_map.Po
+	-rm -f ./$(DEPDIR)/test-test.Po
+	-rm -f ./$(DEPDIR)/test-trie_map.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
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+install-ps-am:
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+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/test-flat_segment_tree.Po
+	-rm -f ./$(DEPDIR)/test-multi_type_matrix.Po
+	-rm -f ./$(DEPDIR)/test-multi_type_vector.Po
+	-rm -f ./$(DEPDIR)/test-point_quad_tree.Po
+	-rm -f ./$(DEPDIR)/test-rtree.Po
+	-rm -f ./$(DEPDIR)/test-segment_tree.Po
+	-rm -f ./$(DEPDIR)/test-sorted_string_map.Po
+	-rm -f ./$(DEPDIR)/test-test.Po
+	-rm -f ./$(DEPDIR)/test-trie_map.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
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+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am \
+	check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/gdb/src/flat_segment_tree.cpp b/test/gdb/src/flat_segment_tree.cpp
new file mode 100644
index 0000000..be4817e
--- /dev/null
+++ b/test/gdb/src/flat_segment_tree.cpp
@@ -0,0 +1,52 @@
+/* Test code for mdds::flat_segment_tree.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <string>
+
+#include <mdds/flat_segment_tree.hpp>
+
+void stop();
+
+using std::string;
+
+using mdds::flat_segment_tree;
+
+void test_flat_segment_tree()
+{
+    flat_segment_tree<int, int> default_fst(0, 100, 42);
+
+    flat_segment_tree<int, int> fst_int(0, 100, 42);
+    fst_int.insert_back(0, 20, 1);
+    fst_int.insert_back(40, 60, 0);
+
+    flat_segment_tree<int, string> fst_string(10, 50, "42");
+    fst_string.insert_back(20, 30, "My hovercraft is full of eels");
+
+    flat_segment_tree<int, int>::const_iterator fst_iter_singular;
+    auto fst_iter1 = fst_int.begin();
+    auto fst_iter2 = fst_iter1;
+    ++fst_iter2;
+
+    flat_segment_tree<int, int>::const_segment_iterator fst_seg_iter_singular;
+    auto fst_seg_iter1 = fst_int.begin_segment();
+    auto fst_seg_iter2 = fst_seg_iter1;
+    ++fst_seg_iter2;
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/multi_type_matrix.cpp b/test/gdb/src/multi_type_matrix.cpp
new file mode 100644
index 0000000..2f0a4df
--- /dev/null
+++ b/test/gdb/src/multi_type_matrix.cpp
@@ -0,0 +1,41 @@
+/* Test code for mdds::multi_type_matrix.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <mdds/multi_type_matrix.hpp>
+
+void stop();
+
+using mdds::multi_type_matrix;
+
+void test_multi_type_matrix()
+{
+    typedef mdds::multi_type_matrix<mdds::mtm::std_string_traits> mtm_type;
+
+    mtm_type empty_mtm;
+
+    mtm_type mtm(4, 2);
+    mtm.set(1, 0, 1);
+    mtm.set(2, 0, 2);
+    mtm.set(3, 0, std::string("a"));
+    mtm.set(0, 1, std::string("b"));
+    mtm.set(1, 1, true);
+    mtm.set(3, 1, 0.5);
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/multi_type_vector.cpp b/test/gdb/src/multi_type_vector.cpp
new file mode 100644
index 0000000..fc24b7b
--- /dev/null
+++ b/test/gdb/src/multi_type_vector.cpp
@@ -0,0 +1,73 @@
+/* Test code for mdds::multi_type_vector.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <string>
+
+#include <mdds/multi_type_vector.hpp>
+
+void stop();
+
+using mdds::multi_type_vector;
+
+void test_multi_type_vector()
+{
+    typedef mdds::multi_type_vector<mdds::mtv::standard_element_blocks_traits> mtv_type;
+
+    mtv_type empty_mtv;
+
+    mtv_type mtv_int;
+    mtv_int.push_back<int>(1);
+    mtv_int.push_back<int>(2);
+    mtv_int.push_back<int>(3);
+    mtv_int.push_back<int>(4);
+
+    mtv_type mtv_string;
+    mtv_string.push_back<std::string>("ab");
+    mtv_string.push_back<std::string>("c");
+
+    mtv_type mtv_int_string(mtv_int);
+    mtv_int_string.push_back<std::string>("ab");
+    mtv_int_string.push_back<std::string>("c");
+    mtv_int_string.push_back<int>(7);
+    mtv_int_string.push_back<int>(8);
+
+    mtv_type mtv_default(2);
+
+    auto mtv_iter_begin = mtv_int_string.begin();
+    auto mtv_iter_next = ++mtv_int_string.begin();
+    auto mtv_iter_end = mtv_int_string.end();
+    (void)mtv_iter_begin;
+    (void)mtv_iter_next;
+    (void)mtv_iter_end;
+
+    auto mtv_iter_cbegin = mtv_int_string.cbegin();
+    auto mtv_iter_cend = mtv_int_string.cend();
+    (void)mtv_iter_cbegin;
+    (void)mtv_iter_cend;
+
+    auto mtv_iter_rbegin = mtv_int_string.rbegin();
+    auto mtv_iter_rend = mtv_int_string.rend();
+    (void)mtv_iter_rbegin;
+    (void)mtv_iter_rend;
+
+    auto mtv_iter_default = mtv_default.begin();
+    (void)mtv_iter_default;
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/point_quad_tree.cpp b/test/gdb/src/point_quad_tree.cpp
new file mode 100644
index 0000000..1d5497e
--- /dev/null
+++ b/test/gdb/src/point_quad_tree.cpp
@@ -0,0 +1,49 @@
+/* Test code for mdds::point_quad_tree.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <mdds/point_quad_tree.hpp>
+
+void stop();
+
+using mdds::point_quad_tree;
+
+void test_point_quad_tree()
+{
+    point_quad_tree<int, int> empty_pqt;
+
+    point_quad_tree<int, int> pqt_int;
+    pqt_int.insert(10, 20, 1);
+    pqt_int.insert(15, 8, 2);
+    pqt_int.insert(25, 12, 3);
+    pqt_int.insert(15, 12, 4);
+
+    point_quad_tree<unsigned, std::string> pqt_string;
+    pqt_string.insert(25, 32, "a");
+    pqt_string.insert(5, 45, "b");
+    pqt_string.insert(52, 10, "c");
+    pqt_string.insert(80, 5, "d");
+    pqt_string.insert(40, 50, "e");
+    pqt_string.insert(10, 10, "f");
+
+    auto pqt_search_empty = pqt_int.search_region(0, 2, 3, 4);
+    auto pqt_search_one = pqt_int.search_region(0, 15, 10, 25);
+    auto pqt_search_more = pqt_int.search_region(0, 10, 15, 25);
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/rtree.cpp b/test/gdb/src/rtree.cpp
new file mode 100644
index 0000000..431c944
--- /dev/null
+++ b/test/gdb/src/rtree.cpp
@@ -0,0 +1,49 @@
+/* Test code for mdds::rtree.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <string>
+
+#include <mdds/rtree.hpp>
+
+void stop();
+
+using mdds::rtree;
+
+void test_rtree()
+{
+    using tree_type = rtree<int, std::string>;
+
+    tree_type empty_tree;
+
+    tree_type tree;
+    tree.insert({{0, 1}, {2, 4}}, "a");
+    tree.insert({{-3, 3}, {5, 8}}, "bc");
+    tree.insert({{-2, 1}, {3, 6}}, "d");
+
+    auto search_empty = tree.search({{0, 0}, {0, 0}}, tree_type::search_type::match);
+    auto search_one = tree.search({{0, 1}, {2, 4}}, tree_type::search_type::match);
+    auto search_more = tree.search({{0, 0}, {1, 5}}, tree_type::search_type::overlap);
+
+    auto iter_begin = search_one.begin();
+    auto iter_end = search_one.end();
+    (void)iter_begin;
+    (void)iter_end;
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/segment_tree.cpp b/test/gdb/src/segment_tree.cpp
new file mode 100644
index 0000000..7d45e10
--- /dev/null
+++ b/test/gdb/src/segment_tree.cpp
@@ -0,0 +1,49 @@
+/* Test code for mdds::segment_tree.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <string>
+
+#include <mdds/segment_tree.hpp>
+
+void stop();
+
+using std::string;
+
+using mdds::segment_tree;
+
+void test_segment_tree()
+{
+    segment_tree<int, int> empty_st;
+
+    segment_tree<int, int> st_int;
+    st_int.insert(0, 10, 1);
+    st_int.insert(5, 20, 2);
+    st_int.insert(40, 50, 3);
+    st_int.insert(-10, 20, 0);
+
+    segment_tree<int, string> st_string;
+    st_string.insert(20, 30, "My hovercraft is full of eels");
+
+    st_int.build_tree();
+    auto search_none = st_int.search(25);
+    auto search_one = st_int.search(42);
+    auto search_more = st_int.search(8);
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/sorted_string_map.cpp b/test/gdb/src/sorted_string_map.cpp
new file mode 100644
index 0000000..8fa3b67
--- /dev/null
+++ b/test/gdb/src/sorted_string_map.cpp
@@ -0,0 +1,41 @@
+/* Test code for mdds::sorted_string_map.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <mdds/global.hpp>
+#include <mdds/sorted_string_map.hpp>
+
+void stop();
+
+using mdds::sorted_string_map;
+
+void test_sorted_string_map()
+{
+    sorted_string_map<int> empty_ssmap(nullptr, 0, 0);
+
+    sorted_string_map<int>::entry entries[] = {
+        {MDDS_ASCII("aaaa"), 1},
+        {MDDS_ASCII("bbb"), 2},
+        {MDDS_ASCII("cc"), 3},
+        {MDDS_ASCII("d"), 4},
+    };
+    size_t entry_count = sizeof(entries) / sizeof(entries[0]);
+    sorted_string_map<int> ssmap_int(entries, entry_count, 0);
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/test.cpp b/test/gdb/src/test.cpp
new file mode 100644
index 0000000..83dd269
--- /dev/null
+++ b/test/gdb/src/test.cpp
@@ -0,0 +1,49 @@
+/* Test suite for gdb pretty printers.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+// forward decls. of tests
+void test_flat_segment_tree();
+void test_multi_type_matrix();
+void test_multi_type_vector();
+void test_point_quad_tree();
+void test_rtree();
+void test_segment_tree();
+void test_sorted_string_map();
+void test_trie_map();
+
+void stop()
+{}
+
+int main()
+try
+{
+    test_flat_segment_tree();
+    test_multi_type_matrix();
+    test_multi_type_vector();
+    test_point_quad_tree();
+    test_rtree();
+    test_segment_tree();
+    test_sorted_string_map();
+    test_trie_map();
+    return 0;
+}
+catch (...)
+{
+    return -1;
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/gdb/src/trie_map.cpp b/test/gdb/src/trie_map.cpp
new file mode 100644
index 0000000..4029edc
--- /dev/null
+++ b/test/gdb/src/trie_map.cpp
@@ -0,0 +1,83 @@
+/* Test code for mdds::trie_map.
+
+   This file is part of mdds.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <mdds/global.hpp>
+#include <mdds/trie_map.hpp>
+
+void stop();
+
+namespace trie = mdds::trie;
+
+using mdds::packed_trie_map;
+using mdds::trie_map;
+
+void test_trie_map()
+{
+    trie_map<trie::std_string_traits, int> empty_tm;
+
+    trie_map<trie::std_string_traits, int> tm_int;
+    tm_int.insert("a", 13);
+    tm_int.insert("aa", 10);
+    tm_int.insert("ab", 3);
+    tm_int.insert("b", 7);
+
+    trie_map<trie::std_string_traits, std::string> tm_str;
+    tm_str.insert("a", "13");
+    tm_str.insert("aa", "10");
+    tm_str.insert("ab", "3");
+    tm_str.insert("b", "7");
+
+    auto tm_search_empty = tm_int.prefix_search("foo");
+    auto tm_search_one = tm_int.prefix_search("b");
+    auto tm_search_more = tm_int.prefix_search("a");
+
+    auto tm_iter_begin = tm_int.begin();
+    auto tm_iter_end = tm_int.end();
+    auto tm_search_iter_begin = tm_search_one.begin();
+    auto tm_search_iter_end = tm_search_one.end();
+    auto tm_search_iter_empty = tm_search_empty.begin();
+
+    packed_trie_map<trie::std_string_traits, int>::entry entries_int[] = {
+        {MDDS_ASCII("a"), 13},
+        {MDDS_ASCII("aa"), 10},
+        {MDDS_ASCII("ab"), 3},
+        {MDDS_ASCII("b"), 7},
+    };
+    packed_trie_map<trie::std_string_traits, int> empty_ptm(entries_int, 0);
+    packed_trie_map<trie::std_string_traits, int> ptm_int(entries_int, MDDS_N_ELEMENTS(entries_int));
+    packed_trie_map<trie::std_string_traits, std::string>::entry entries_str[] = {
+        {MDDS_ASCII("a"), "13"},
+        {MDDS_ASCII("aa"), "10"},
+        {MDDS_ASCII("ab"), "3"},
+        {MDDS_ASCII("b"), "7"},
+    };
+    packed_trie_map<trie::std_string_traits, std::string> ptm_str(entries_str, MDDS_N_ELEMENTS(entries_str));
+
+    auto ptm_search_empty = ptm_int.prefix_search("foo");
+    auto ptm_search_one = ptm_int.prefix_search("b");
+    auto ptm_search_more = ptm_int.prefix_search("a");
+
+    auto ptm_iter_begin = ptm_int.begin();
+    auto ptm_iter_end = ptm_int.end();
+    auto ptm_search_iter_begin = ptm_search_one.begin();
+    auto ptm_search_iter_end = ptm_search_one.end();
+    auto ptm_search_iter_empty = ptm_search_empty.begin();
+
+    stop();
+}
+
+// vim: set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/test/include/Makefile.am b/test/include/Makefile.am
new file mode 100644
index 0000000..1df18d4
--- /dev/null
+++ b/test/include/Makefile.am
@@ -0,0 +1 @@
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diff --git a/test/include/Makefile.in b/test/include/Makefile.in
new file mode 100644
index 0000000..0939e30
--- /dev/null
+++ b/test/include/Makefile.in
@@ -0,0 +1,460 @@
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+check-valgrind-helgrind: check-valgrind-helgrind-am
+
+check-valgrind-helgrind-am: check-valgrind-helgrind-local
+
+check-valgrind-memcheck: check-valgrind-memcheck-am
+
+check-valgrind-memcheck-am: check-valgrind-memcheck-local
+
+check-valgrind-sgcheck: check-valgrind-sgcheck-am
+
+check-valgrind-sgcheck-am: check-valgrind-sgcheck-local
+
+clean: clean-am
+
+clean-am: clean-generic mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info-am:
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+
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+
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+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+pdf: pdf-am
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+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am check-valgrind-am \
+	check-valgrind-drd-am check-valgrind-drd-local \
+	check-valgrind-helgrind-am check-valgrind-helgrind-local \
+	check-valgrind-local check-valgrind-memcheck-am \
+	check-valgrind-memcheck-local check-valgrind-sgcheck-am \
+	check-valgrind-sgcheck-local clean clean-generic cscopelist-am \
+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/include/test_global.hpp b/test/include/test_global.hpp
new file mode 100644
index 0000000..0ed6f33
--- /dev/null
+++ b/test/include/test_global.hpp
@@ -0,0 +1,97 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2010-2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_TEST_GLOBAL_HPP
+#define INCLUDED_TEST_GLOBAL_HPP
+
+#ifdef NDEBUG
+// release build
+#undef NDEBUG
+#include <cassert>
+#define NDEBUG
+#else
+// debug build
+#include <cassert>
+#endif
+
+#include <cstdio>
+#include <string>
+#include <cstdint>
+#include <iostream>
+#include <sstream>
+
+struct cmd_options
+{
+    bool test_func;
+    bool test_perf;
+
+    cmd_options();
+};
+
+bool parse_cmd_options(int argc, char** argv, cmd_options& opt);
+
+double get_current_time();
+
+class stack_watch
+{
+public:
+    stack_watch();
+
+    void reset();
+    double get_duration() const;
+
+private:
+    double m_start_time;
+};
+
+class stack_printer
+{
+public:
+    explicit stack_printer(const char* msg);
+    stack_printer(std::string msg);
+
+    ~stack_printer();
+
+    void print_time(int line) const;
+
+private:
+    std::string m_msg;
+    double m_start_time;
+};
+
+using std::cerr;
+using std::cout;
+using std::endl;
+
+#define MDDS_TEST_FUNC_SCOPE stack_printer __sp__(__func__)
+
+#define MDDS_TEST_FUNC_SCOPE_MSG(stream) \
+    std::ostringstream __sp_os__; \
+    __sp_os__ << __func__ << ' ' << stream; \
+    stack_printer __sp__(__sp_os__.str())
+
+#endif
diff --git a/test/multi_type_matrix/Makefile.am b/test/multi_type_matrix/Makefile.am
new file mode 100644
index 0000000..7cedf46
--- /dev/null
+++ b/test/multi_type_matrix/Makefile.am
@@ -0,0 +1,18 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = test-main test-walk
+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_walk_SOURCES = \
+	test_walk.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+TESTS = test-main test-walk
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/multi_type_matrix/Makefile.in b/test/multi_type_matrix/Makefile.in
new file mode 100644
index 0000000..25dcc86
--- /dev/null
+++ b/test/multi_type_matrix/Makefile.in
@@ -0,0 +1,1012 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
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+}
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+  { \
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+  for flg in $$sane_makeflags; do \
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+      -*I?*) strip_trailopt 'I';; \
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+      -[JT]) skip_next=yes;; \
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+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
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+am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_compile_stdcxx.m4 \
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+	check-valgrind-sgcheck-recursive
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+  fi; \
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+  esac;
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+  for p in $$list; do echo "$$p"; done | sed -e "s|$$srcdirstrip/||"
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+{ \
+  print header; \
+  len = length(header); \
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+  printf "\n\n"; \
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+  global_test_result = "RUN"; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
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+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+	-test -z "$(top_builddir)/test/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(am__dirstamp)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+check-valgrind: check-valgrind-am
+
+check-valgrind-am: check-valgrind-local
+
+check-valgrind-drd: check-valgrind-drd-am
+
+check-valgrind-drd-am: check-valgrind-drd-local
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+check-valgrind-helgrind: check-valgrind-helgrind-am
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+check-valgrind-helgrind-am: check-valgrind-helgrind-local
+
+check-valgrind-memcheck: check-valgrind-memcheck-am
+
+check-valgrind-memcheck-am: check-valgrind-memcheck-local
+
+check-valgrind-sgcheck: check-valgrind-sgcheck-am
+
+check-valgrind-sgcheck-am: check-valgrind-sgcheck-local
+
+clean: clean-am
+
+clean-am: clean-checkPROGRAMS clean-generic mostlyclean-am
+
+distclean: distclean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f ./$(DEPDIR)/test_walk.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
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+info-am:
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+install-dvi-am:
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+install-html: install-html-am
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+install-man:
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+install-pdf: install-pdf-am
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+install-pdf-am:
+
+install-ps: install-ps-am
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f ./$(DEPDIR)/test_walk.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+mostlyclean: mostlyclean-am
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+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
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+pdf-am:
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+ps: ps-am
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+ps-am:
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+uninstall-am:
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+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_matrix/test_main.cpp b/test/multi_type_matrix/test_main.cpp
new file mode 100644
index 0000000..58c4415
--- /dev/null
+++ b/test/multi_type_matrix/test_main.cpp
@@ -0,0 +1,1140 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2012-2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+#include <mdds/multi_type_matrix.hpp>
+
+#include <string>
+#include <ostream>
+#include <functional>
+
+using namespace mdds;
+using namespace std;
+
+// Standard matrix that uses std::string as its string type.
+typedef multi_type_matrix<mtm::std_string_traits> mtx_type;
+
+// Custom string code --------------------------------------------------------
+
+class custom_string
+{
+    string m_val;
+
+public:
+    custom_string()
+    {}
+    custom_string(const string& val) : m_val(val)
+    {}
+    custom_string(const custom_string& r) : m_val(r.m_val)
+    {}
+    const string& get() const
+    {
+        return m_val;
+    }
+    bool operator==(const custom_string& r) const
+    {
+        return m_val == r.m_val;
+    }
+    bool operator!=(const custom_string& r) const
+    {
+        return !operator==(r);
+    }
+};
+
+ostream& operator<<(ostream& os, const custom_string& str)
+{
+    os << str.get();
+    return os;
+}
+
+const mtv::element_t element_type_custom_string = mdds::mtv::element_type_user_start;
+typedef mtv::default_element_block<element_type_custom_string, custom_string> custom_string_block;
+
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(custom_string, element_type_custom_string, custom_string(), custom_string_block)
+
+struct custom_string_trait
+{
+    typedef mdds::mtv::int32_element_block integer_element_block;
+    typedef custom_string_block string_element_block;
+};
+
+typedef mdds::multi_type_matrix<custom_string_trait> mtx_custom_type;
+
+namespace {
+
+template<typename _T>
+void check_value(mtx_type& mtx, size_t row, size_t col, const _T& val)
+{
+    mtx.set(row, col, val);
+    _T test = mtx.get<_T>(row, col);
+    assert(test == val);
+}
+
+bool check_copy(const mtx_type& mx1, const mtx_type& mx2)
+{
+    size_t row_count = min(mx1.size().row, mx2.size().row);
+    size_t col_count = min(mx1.size().column, mx2.size().column);
+    for (size_t i = 0; i < row_count; ++i)
+    {
+        for (size_t j = 0; j < col_count; ++j)
+        {
+            mtm::element_t elem_type = mx1.get_type(i, j);
+            if (elem_type != mx2.get_type(i, j))
+            {
+                cout << "check_copy: (row=" << i << ",column=" << j << ") element types differ." << endl;
+                return false;
+            }
+
+            switch (elem_type)
+            {
+                case mtm::element_boolean:
+                    if (mx1.get<bool>(i, j) != mx2.get<bool>(i, j))
+                    {
+                        cout << "check_copy: (row=" << i << ",column=" << j << ") different boolean values." << endl;
+                        return false;
+                    }
+                    break;
+                case mtm::element_numeric:
+                    if (mx1.get<double>(i, j) != mx2.get<double>(i, j))
+                    {
+                        cout << "check_copy: (row=" << i << ",column=" << j << ") different numeric values." << endl;
+                        return false;
+                    }
+                    break;
+                case mtm::element_string:
+                    if (mx1.get<mtx_type::string_type>(i, j) != mx2.get<mtx_type::string_type>(i, j))
+                    {
+                        cout << "check_copy: (row=" << i << ",column=" << j << ") different string values." << endl;
+                        return false;
+                    }
+                    break;
+                case mtm::element_empty:
+                default:;
+            }
+        }
+    }
+    return true;
+}
+
+} // namespace
+
+void mtm_test_construction()
+{
+    stack_printer __stack_printer__("::mtm_test_construction");
+    {
+        // default constructor.
+        mtx_type mtx;
+        mtx_type::size_pair_type sz = mtx.size();
+        assert(sz.row == 0 && sz.column == 0);
+    }
+
+    {
+        // construction to a specific size.
+        mtx_type mtx(2, 5);
+        mtx_type::size_pair_type sz = mtx.size();
+        assert(sz.row == 2 && sz.column == 5);
+    }
+
+    {
+        // construction to a specific size with default value.
+        mtx_type mtx(2, 5, string("foo"));
+        mtx_type::size_pair_type sz = mtx.size();
+        assert(sz.row == 2 && sz.column == 5);
+        assert(mtx.get_type(0, 0) == mtm::element_string);
+        assert(mtx.get_string(0, 0) == "foo");
+        assert(mtx.get_type(1, 4) == mtm::element_string);
+        assert(mtx.get_string(1, 4) == "foo");
+    }
+
+    {
+        // construct with an array of data.
+        vector<double> vals;
+        vals.push_back(1.1);
+        vals.push_back(1.2);
+        vals.push_back(1.3);
+        vals.push_back(1.4);
+        mtx_type mtx(2, 2, vals.begin(), vals.end());
+        mtx_type::size_pair_type sz = mtx.size();
+        assert(sz.row == 2 && sz.column == 2);
+        assert(mtx.get_numeric(0, 0) == 1.1);
+        assert(mtx.get_numeric(1, 0) == 1.2);
+        assert(mtx.get_numeric(0, 1) == 1.3);
+        assert(mtx.get_numeric(1, 1) == 1.4);
+
+        try
+        {
+            mtx_type mtx2(3, 2, vals.begin(), vals.end());
+            assert(!"Construction of this matrix should have failed!");
+        }
+        catch (const invalid_arg_error& e)
+        {
+            // Good.
+            cout << "exception caught (as expected) which says: " << e.what() << endl;
+        }
+
+        try
+        {
+            // Trying to initialize a matrix with array of unsupported data
+            // type should end with an exception thrown.
+            vector<int8_t> vals_ptr(4, 22);
+            mtx_type mtx3(2, 2, vals_ptr.begin(), vals_ptr.end());
+            assert(!"Construction of this matrix should have failed!");
+        }
+        catch (const exception& e)
+        {
+            cout << "exception caught (as expected) which says: " << e.what() << endl;
+        }
+    }
+
+    {
+        // Construct with an array of custom string type.
+        vector<custom_string> vals;
+        vals.push_back(custom_string("A"));
+        vals.push_back(custom_string("B"));
+        vals.push_back(custom_string("C"));
+        vals.push_back(custom_string("D"));
+        mtx_custom_type mtx(1, 4, vals.begin(), vals.end());
+        assert(mtx.get_string(0, 0).get() == "A");
+        assert(mtx.get_string(0, 1).get() == "B");
+        assert(mtx.get_string(0, 2).get() == "C");
+        assert(mtx.get_string(0, 3).get() == "D");
+        assert(mtx.get_type(0, 0) == mtm::element_string);
+        assert(mtx.get_type(0, 1) == mtm::element_string);
+        assert(mtx.get_type(0, 2) == mtm::element_string);
+        assert(mtx.get_type(0, 3) == mtm::element_string);
+    }
+
+    {
+        // Construct size_pair_type from initializer list.
+        mtx_type::size_pair_type sz({3, 4});
+        assert(sz.row == 3);
+        assert(sz.column == 4);
+    }
+}
+
+void mtm_test_data_insertion()
+{
+    stack_printer __stack_printer__("::mtm_test_data_insertion");
+    {
+        // Create with empty elements.
+        mtx_type mtx(3, 4);
+        mtx_type::size_pair_type sz = mtx.size();
+        assert(sz.row == 3 && sz.column == 4);
+        assert(!mtx.empty());
+        assert(mtx.get_type(0, 0) == mtm::element_empty);
+        assert(mtx.get_type(2, 3) == mtm::element_empty);
+        check_value(mtx, 1, 1, 1.2);
+        check_value(mtx, 2, 1, true);
+        check_value(mtx, 3, 1, false);
+        check_value(mtx, 0, 2, string("foo"));
+        check_value(mtx, 1, 2, 23.4);
+
+        // Overwrite
+        assert(mtx.get_type(1, 1) == mtm::element_numeric);
+        check_value(mtx, 1, 1, string("baa"));
+
+        // Setting empty.
+        assert(mtx.get_type(1, 1) == mtm::element_string);
+        mtx.set_empty(1, 1);
+        assert(mtx.get_type(1, 1) == mtm::element_empty);
+
+        mtx.clear();
+        assert(mtx.size().row == 0);
+        assert(mtx.size().column == 0);
+        assert(mtx.empty());
+    }
+}
+
+void mtm_test_data_insertion_multiple()
+{
+    stack_printer __stack_printer__("::mtm_test_data_insertion_multiple");
+    {
+        mtx_type mtx(3, 5);
+
+        // data shorter than column length
+        vector<double> vals;
+        vals.push_back(1.1);
+        vals.push_back(1.2);
+        mtx.set_column(2, vals.begin(), vals.end());
+        assert(mtx.get_numeric(0, 2) == 1.1);
+        assert(mtx.get_numeric(1, 2) == 1.2);
+        assert(mtx.get_type(2, 2) == mtm::element_empty);
+
+        // data exatly at column length
+        vals.clear();
+        vals.push_back(2.1);
+        vals.push_back(2.2);
+        vals.push_back(2.3);
+        mtx.set_column(2, vals.begin(), vals.end());
+        assert(mtx.get_numeric(0, 2) == 2.1);
+        assert(mtx.get_numeric(1, 2) == 2.2);
+        assert(mtx.get_numeric(2, 2) == 2.3);
+        assert(mtx.get_type(0, 3) == mtm::element_empty);
+
+        // data longer than column length.  The excess data should be ignored.
+        vals.clear();
+        vals.push_back(3.1);
+        vals.push_back(3.2);
+        vals.push_back(3.3);
+        vals.push_back(3.4);
+        mtx.set_column(2, vals.begin(), vals.end());
+        assert(mtx.get_numeric(0, 2) == 3.1);
+        assert(mtx.get_numeric(1, 2) == 3.2);
+        assert(mtx.get_numeric(2, 2) == 3.3);
+        assert(mtx.get_type(0, 3) == mtm::element_empty);
+    }
+}
+
+void mtm_test_data_insertion_integer()
+{
+    stack_printer __stack_printer__("::mtm_test_data_insertion_integer");
+
+    // +--------+--------+
+    // |  int   | double |
+    // +--------+--------+
+    // | double |  int   |
+    // +--------+--------+
+
+    mtx_type mtx(2, 2);
+    mtx.set(0, 0, int(0));
+    mtx.set(1, 1, int(22));
+    mtx.set(0, 1, double(10));
+    mtx.set(1, 0, double(22));
+
+    assert(mtx.get_type(0, 0) == mtm::element_integer);
+    assert(mtx.get_type(1, 1) == mtm::element_integer);
+    assert(mtx.get_type(0, 1) == mtm::element_numeric);
+    assert(mtx.get_type(1, 0) == mtm::element_numeric);
+
+    assert(mtx.get_integer(0, 0) == 0);
+    assert(mtx.get_integer(1, 1) == 22);
+    assert(mtx.get_integer(0, 1) == 10);
+    assert(mtx.get_integer(1, 0) == 22);
+
+    assert(mtx.get_numeric(0, 0) == 0.0);
+    assert(mtx.get_numeric(1, 1) == 22.0);
+    assert(mtx.get_numeric(0, 1) == 10.0);
+    assert(mtx.get_numeric(1, 0) == 22.0);
+
+    assert(mtx.get_boolean(0, 0) == false);
+    assert(mtx.get_boolean(1, 1) == true);
+    assert(mtx.get_boolean(0, 1) == true);
+    assert(mtx.get_boolean(1, 0) == true);
+
+    assert(mtx.numeric()); // integers are considered numeric.
+
+    assert(mtx.get<int>(0, 0) == 0);
+    assert(mtx.get<int>(1, 1) == 22);
+
+    mtx_type::position_type pos = mtx.position(0, 1);
+    mtx.set(pos, int(987));
+    assert(mtx.get<int>(0, 1) == 987);
+
+    // +--------+--------+
+    // |  int   |  int   |
+    // +--------+--------+
+    // | double |  int   |
+    // +--------+--------+
+
+    vector<mtx_type::element_block_node_type> nodes;
+
+    std::function<void(const mtx_type::element_block_node_type&)> f =
+        [&nodes](const mtx_type::element_block_node_type& node) { nodes.push_back(node); };
+
+    mtx.walk(f);
+
+    assert(nodes.size() == 3);
+    assert(nodes[0].type == mtm::element_integer);
+    assert(nodes[0].size == 1);
+    assert(nodes[1].type == mtm::element_numeric);
+    assert(nodes[1].size == 1);
+    assert(nodes[2].type == mtm::element_integer);
+    assert(nodes[2].size == 2);
+
+    {
+        auto it = nodes[2].begin<mtx_type::integer_block_type>();
+        auto ite = nodes[2].end<mtx_type::integer_block_type>();
+        assert(*it == 987);
+        ++it;
+        assert(*it == 22);
+        ++it;
+        assert(it == ite);
+    }
+}
+
+void mtm_test_set_empty()
+{
+    stack_printer __stack_printer__("::mtm_test_set_empty");
+    {
+        // set whole column empty.
+        mtx_type mtx(3, 5, 1.2);
+        cout << "setting whole column 2 empty..." << endl;
+        mtx.set_column_empty(2);
+        assert(mtx.get_type(0, 1) != mtm::element_empty);
+        assert(mtx.get_type(1, 1) != mtm::element_empty);
+        assert(mtx.get_type(2, 1) != mtm::element_empty);
+        assert(mtx.get_type(0, 2) == mtm::element_empty);
+        assert(mtx.get_type(1, 2) == mtm::element_empty);
+        assert(mtx.get_type(2, 2) == mtm::element_empty);
+        assert(mtx.get_type(0, 3) != mtm::element_empty);
+        assert(mtx.get_type(1, 3) != mtm::element_empty);
+        assert(mtx.get_type(2, 3) != mtm::element_empty);
+    }
+
+    {
+        // set whole row empty.
+        mtx_type mtx(3, 5, 1.2);
+        cout << "setting whole row 1 empty..." << endl;
+        mtx.set_row_empty(1);
+        assert(mtx.get_type(0, 0) != mtm::element_empty);
+        assert(mtx.get_type(0, 1) != mtm::element_empty);
+        assert(mtx.get_type(0, 2) != mtm::element_empty);
+        assert(mtx.get_type(0, 3) != mtm::element_empty);
+        assert(mtx.get_type(0, 4) != mtm::element_empty);
+        assert(mtx.get_type(1, 0) == mtm::element_empty);
+        assert(mtx.get_type(1, 1) == mtm::element_empty);
+        assert(mtx.get_type(1, 2) == mtm::element_empty);
+        assert(mtx.get_type(1, 3) == mtm::element_empty);
+        assert(mtx.get_type(1, 4) == mtm::element_empty);
+        assert(mtx.get_type(2, 0) != mtm::element_empty);
+        assert(mtx.get_type(2, 1) != mtm::element_empty);
+        assert(mtx.get_type(2, 2) != mtm::element_empty);
+        assert(mtx.get_type(2, 3) != mtm::element_empty);
+        assert(mtx.get_type(2, 4) != mtm::element_empty);
+    }
+
+    {
+        // Set a range of elements empty.
+        mtx_type mtx(5, 3, string("A"));
+        cout << "setting element (0,1) to (1,2) empty..." << endl;
+        mtx.set_empty(1, 0, 6); // rows 1-4 in column 0 and rows 0-1 in column 1.
+        assert(mtx.get_type(0, 0) == mtm::element_string);
+        assert(mtx.get_type(1, 0) == mtm::element_empty);
+        assert(mtx.get_type(2, 0) == mtm::element_empty);
+        assert(mtx.get_type(3, 0) == mtm::element_empty);
+        assert(mtx.get_type(4, 0) == mtm::element_empty);
+        assert(mtx.get_type(0, 1) == mtm::element_empty);
+        assert(mtx.get_type(1, 1) == mtm::element_empty);
+        assert(mtx.get_type(2, 1) == mtm::element_string);
+        assert(mtx.get_type(3, 1) == mtm::element_string);
+        assert(mtx.get_type(4, 1) == mtm::element_string);
+        assert(mtx.get_type(0, 2) == mtm::element_string);
+        assert(mtx.get_type(1, 2) == mtm::element_string);
+        assert(mtx.get_type(2, 2) == mtm::element_string);
+        assert(mtx.get_type(3, 2) == mtm::element_string);
+        assert(mtx.get_type(4, 2) == mtm::element_string);
+
+        try
+        {
+            mtx.set_empty(2, 2, 0);
+            assert(false);
+        }
+        catch (const std::exception&)
+        {
+            cout << "exception thrown on length of zero as expected" << endl;
+        }
+    }
+}
+
+void mtm_test_swap()
+{
+    stack_printer __stack_printer__("::mtm_test_swap");
+    mtx_type mtx1(3, 6), mtx2(7, 2);
+    mtx1.set(0, 0, 1.1);
+    mtx1.set(2, 5, 1.9);
+    mtx2.set(0, 0, 2.1);
+    mtx2.set(6, 1, 2.9);
+    mtx1.swap(mtx2);
+
+    assert(mtx1.size().row == 7);
+    assert(mtx1.size().column == 2);
+    assert(mtx1.get<double>(0, 0) == 2.1);
+    assert(mtx1.get<double>(6, 1) == 2.9);
+
+    assert(mtx2.size().row == 3);
+    assert(mtx2.size().column == 6);
+    assert(mtx2.get<double>(0, 0) == 1.1);
+    assert(mtx2.get<double>(2, 5) == 1.9);
+}
+
+void mtm_test_transpose()
+{
+    stack_printer __stack_printer__("::mtm_test_transpose");
+    mtx_type mtx(3, 6);
+    mtx.set(0, 0, 1.1);
+    mtx.set(1, 0, 1.2);
+    mtx.set(2, 0, 1.3);
+    mtx.set(1, 5, string("foo"));
+    mtx.set(2, 3, true);
+    mtx.transpose();
+    assert(mtx.size().row == 6);
+    assert(mtx.size().column == 3);
+    assert(mtx.get<double>(0, 0) == 1.1);
+    assert(mtx.get<double>(0, 1) == 1.2);
+    assert(mtx.get<double>(0, 2) == 1.3);
+    assert(mtx.get<string>(5, 1) == "foo");
+    assert(mtx.get<bool>(3, 2) == true);
+}
+
+void mtm_test_resize()
+{
+    stack_printer __stack_printer__("::mtm_test_resize");
+    mtx_type mtx(0, 0);
+    assert(mtx.size().row == 0);
+    assert(mtx.size().column == 0);
+    assert(mtx.empty());
+
+    mtx.resize(1, 3);
+    assert(mtx.size().row == 1);
+    assert(mtx.size().column == 3);
+    assert(!mtx.empty());
+    assert(mtx.get_type(0, 0) == mtm::element_empty);
+    assert(mtx.get_type(0, 1) == mtm::element_empty);
+    assert(mtx.get_type(0, 2) == mtm::element_empty);
+
+    mtx.set(0, 0, 1.1);
+    mtx.set(0, 1, string("foo"));
+    mtx.set(0, 2, true);
+    assert(mtx.get<double>(0, 0) == 1.1);
+    assert(mtx.get<string>(0, 1) == "foo");
+    assert(mtx.get<bool>(0, 2) == true);
+
+    // This shouldn't alter the original content.
+    mtx.resize(2, 4);
+    assert(mtx.size().row == 2);
+    assert(mtx.size().column == 4);
+    assert(mtx.get<double>(0, 0) == 1.1);
+    assert(mtx.get<string>(0, 1) == "foo");
+    assert(mtx.get<bool>(0, 2) == true);
+    assert(mtx.get_type(1, 3) == mtm::element_empty);
+
+    mtx.resize(2, 2);
+    assert(mtx.size().row == 2);
+    assert(mtx.size().column == 2);
+    assert(mtx.get<double>(0, 0) == 1.1);
+    assert(mtx.get<string>(0, 1) == "foo");
+    assert(mtx.get_type(1, 0) == mtm::element_empty);
+    assert(mtx.get_type(1, 1) == mtm::element_empty);
+
+    // Three ways to resize to empty matrix.
+    mtx.resize(2, 0);
+    assert(mtx.size().row == 0);
+    assert(mtx.size().column == 0);
+
+    mtx.resize(2, 2);
+    mtx.resize(0, 2);
+    assert(mtx.size().row == 0);
+    assert(mtx.size().column == 0);
+
+    mtx.resize(2, 2);
+    mtx.resize(0, 0);
+    assert(mtx.size().row == 0);
+    assert(mtx.size().column == 0);
+
+    // Resize with initial value when the matrix becomes larger.
+    mtx.resize(3, 2, 12.5);
+    assert(mtx.size().row == 3);
+    assert(mtx.size().column == 2);
+    assert(mtx.get<double>(2, 1) == 12.5);
+    assert(mtx.get<double>(2, 0) == 12.5);
+    assert(mtx.get<double>(0, 0) == 12.5);
+    assert(mtx.get<double>(0, 1) == 12.5);
+
+    // The initial value should be ignored when shrinking.
+    mtx.resize(2, 1, true);
+    assert(mtx.size().row == 2);
+    assert(mtx.size().column == 1);
+    assert(mtx.get<double>(1, 0) == 12.5);
+
+    // Resize again with initial value of different type.
+    mtx.resize(3, 2, string("extra"));
+    assert(mtx.size().row == 3);
+    assert(mtx.size().column == 2);
+    assert(mtx.get<double>(0, 0) == 12.5);
+    assert(mtx.get<double>(1, 0) == 12.5);
+    assert(mtx.get<string>(2, 1) == "extra");
+    assert(mtx.get<string>(2, 0) == "extra");
+    assert(mtx.get<string>(1, 1) == "extra");
+    assert(mtx.get<string>(0, 1) == "extra");
+}
+
+void mtm_test_copy()
+{
+    stack_printer __stack_printer__("::mtm_test_copy");
+
+    // Assigning from a smaller matrix to a bigger one.
+    mtx_type mx1(5, 5), mx2(2, 2);
+    mx2.set(0, 0, 1.2);
+    mx2.set(1, 1, true);
+    mx2.set(0, 1, string("test"));
+    mx2.set(1, 0, string("foo"));
+    mx1.copy(mx2);
+
+    bool success = check_copy(mx1, mx2);
+    assert(success);
+
+    mx2.resize(8, 8);
+    mx2.copy(mx1);
+
+    success = check_copy(mx1, mx2);
+    assert(success);
+
+    // from a larger matrix to a smaller one.
+    mx1.set(0, 0, string("test1"));
+    mx2.set(0, 0, string("test2"));
+    mx2.set(4, 4, true);
+    mx2.set(7, 7, false);
+    mx1.copy(mx2);
+    success = check_copy(mx1, mx2);
+    assert(success);
+
+    // self assignment (should be no-op).
+    mx1.copy(mx1);
+    success = check_copy(mx1, mx1);
+    assert(success);
+
+    mx2.copy(mx2);
+    success = check_copy(mx2, mx2);
+    assert(success);
+}
+
+void mtm_test_copy_empty_destination()
+{
+    stack_printer __stack_printer__("::mtm_test_copy_empty_destination");
+
+    mtx_type mx1, mx2(1, 1);
+    mx1.copy(mx2); // This should not throw.
+
+    mx2.copy(mx1); // This should not throw either.
+}
+
+void mtm_test_copy_from_array()
+{
+    stack_printer __stack_printer__("::mtm_test_copy_from_array");
+
+    vector<double> src;
+    src.reserve(9);
+    for (size_t i = 0; i < 9; ++i)
+        src.push_back(double(i));
+
+    mtx_type mx(4, 4);
+    mx.copy(3, 3, src.begin(), src.end());
+
+    assert(mx.get<double>(0, 0) == 0.0);
+    assert(mx.get<double>(1, 0) == 1.0);
+    assert(mx.get<double>(2, 0) == 2.0);
+    assert(mx.get<double>(0, 1) == 3.0);
+    assert(mx.get<double>(1, 1) == 4.0);
+    assert(mx.get<double>(2, 1) == 5.0);
+    assert(mx.get<double>(0, 2) == 6.0);
+    assert(mx.get<double>(1, 2) == 7.0);
+    assert(mx.get<double>(2, 2) == 8.0);
+    assert(mx.get_type(3, 0) == mtm::element_empty);
+    assert(mx.get_type(3, 1) == mtm::element_empty);
+    assert(mx.get_type(3, 2) == mtm::element_empty);
+    assert(mx.get_type(3, 3) == mtm::element_empty);
+    assert(mx.get_type(0, 3) == mtm::element_empty);
+    assert(mx.get_type(1, 3) == mtm::element_empty);
+    assert(mx.get_type(2, 3) == mtm::element_empty);
+    assert(mx.get_type(3, 3) == mtm::element_empty);
+
+    vector<std::string> src2;
+    src2.reserve(4);
+    src2.push_back("A");
+    src2.push_back("B");
+    src2.push_back("C");
+    src2.push_back("D");
+
+    mx.copy(2, 2, src2.begin(), src2.end());
+
+    assert(mx.get<std::string>(0, 0) == "A");
+    assert(mx.get<std::string>(1, 0) == "B");
+    assert(mx.get<std::string>(0, 1) == "C");
+    assert(mx.get<std::string>(1, 1) == "D");
+    assert(mx.get<double>(2, 0) == 2.0);
+    assert(mx.get<double>(2, 1) == 5.0);
+    assert(mx.get<double>(0, 2) == 6.0);
+    assert(mx.get<double>(1, 2) == 7.0);
+    assert(mx.get<double>(2, 2) == 8.0);
+    assert(mx.get_type(3, 0) == mtm::element_empty);
+    assert(mx.get_type(3, 1) == mtm::element_empty);
+    assert(mx.get_type(3, 2) == mtm::element_empty);
+    assert(mx.get_type(3, 3) == mtm::element_empty);
+    assert(mx.get_type(0, 3) == mtm::element_empty);
+    assert(mx.get_type(1, 3) == mtm::element_empty);
+    assert(mx.get_type(2, 3) == mtm::element_empty);
+    assert(mx.get_type(3, 3) == mtm::element_empty);
+
+    vector<bool> src3;
+    src3.push_back(true);
+    src3.push_back(false);
+    src3.push_back(true);
+    src3.push_back(false);
+
+    mx.copy(4, 1, src3.begin(), src3.end());
+    assert(mx.get<bool>(0, 0) == true);
+    assert(mx.get<bool>(1, 0) == false);
+    assert(mx.get<bool>(2, 0) == true);
+    assert(mx.get<bool>(3, 0) == false);
+
+    // Try to copy from an array of invalid type.
+    vector<int8_t> src_invalid;
+    src_invalid.push_back('a');
+    src_invalid.push_back('b');
+
+    try
+    {
+        mx.copy(2, 1, src_invalid.begin(), src_invalid.end());
+        assert(!"type_error did not get thrown.");
+    }
+    catch (const mdds::type_error& e)
+    {
+        cout << "expected exception was thrown: '" << e.what() << "'" << endl;
+    }
+}
+
+void mtm_test_assignment()
+{
+    stack_printer __stack_printer__("::mtm_test_assignment");
+    mtx_type mx_orig(5, 5, 1.2);
+    mtx_type mx_copied = mx_orig;
+    assert(mx_orig == mx_copied);
+
+    mx_copied = mx_copied; // self assignment.
+    assert(mx_orig == mx_copied);
+
+    mx_orig.set(2, 3, true);
+    mx_orig.set(1, 1, string("foo"));
+    mx_copied = mx_orig;
+    assert(mx_orig == mx_copied);
+}
+
+void mtm_test_numeric()
+{
+    // Numeric elements only matrix is numeric.
+    mtx_type mtx(2, 2, 1.1);
+    assert(mtx.numeric());
+
+    // Boolean element is numeric.
+    mtx.set(0, 0, true);
+    assert(mtx.numeric());
+
+    // String element is not.
+    mtx.set(1, 0, string("foo"));
+    assert(!mtx.numeric());
+
+    mtx.set(1, 0, 1.3);
+    assert(mtx.numeric());
+
+    // Empty element is not numeric.
+    mtx.set_empty(1, 1);
+    assert(!mtx.numeric());
+
+    // Empty matrix is not numeric.
+    mtx.clear();
+    assert(!mtx.numeric());
+}
+
+void mtm_test_custom_string()
+{
+    stack_printer __stack_printer__("::mtm_test_custom_string");
+    mtx_custom_type mtx(2, 2);
+    mtx.set(0, 0, custom_string("foo"));
+    assert(mtx.get_type(0, 0) == mtm::element_string);
+    assert(mtx.get<custom_string>(0, 0) == custom_string("foo"));
+    mtx.set(1, 1, 12.3);
+    assert(mtx.get<double>(1, 1) == 12.3);
+}
+
+void mtm_test_position()
+{
+    stack_printer __stack_printer__("::mtm_test_position");
+    mtx_type mtx(3, 2);
+    mtx.set(0, 0, 1.0);
+    mtx.set(0, 1, string("foo"));
+    mtx.set(1, 0, 2.0);
+    mtx.set(1, 1, 2.1);
+    mtx.set(2, 0, true);
+    mtx.set(2, 1, false);
+
+    assert(mtx.get_type(0, 0) == mtm::element_numeric);
+    assert(mtx.get_type(0, 1) == mtm::element_string);
+    assert(mtx.get_type(1, 0) == mtm::element_numeric);
+    assert(mtx.get_type(1, 1) == mtm::element_numeric);
+    assert(mtx.get_type(2, 0) == mtm::element_boolean);
+    assert(mtx.get_type(2, 1) == mtm::element_boolean);
+
+    mtx_type::position_type pos = mtx.position(1, 1);
+    assert(mtx.get_type(pos) == mtm::element_numeric);
+    assert(mtx.get_numeric(pos) == 2.1);
+
+    pos = mtx.position(2, 0);
+    assert(mtx.get_type(pos) == mtm::element_boolean);
+    assert(mtx.get_boolean(pos) == true);
+
+    pos = mtx.position(0, 1);
+    assert(mtx.get_type(pos) == mtm::element_string);
+    assert(mtx.get_string(pos) == "foo");
+
+    mtx.set_empty(pos);
+    assert(mtx.get_type(0, 1) == mtm::element_empty);
+
+    pos = mtx.position(1, 1);
+    mtx.set(pos, false);
+    assert(mtx.get_type(1, 1) == mtm::element_boolean);
+    assert(mtx.get_boolean(1, 1) == false);
+
+    pos = mtx.position(2, 0);
+    mtx.set(pos, 12.3);
+    assert(mtx.get_type(2, 0) == mtm::element_numeric);
+    assert(mtx.get_numeric(2, 0) == 12.3);
+
+    pos = mtx.position(2, 1);
+    mtx.set(pos, string("ABC"));
+    assert(mtx.get_type(2, 1) == mtm::element_string);
+    assert(mtx.get_string(2, 1) == "ABC");
+
+    // Start over, and test the traversal of position object.
+    pos = mtx.position(0, 0);
+    mtx_type::size_pair_type mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.column == 0);
+    assert(mtx_pos.row == 0);
+
+    pos = mtx_type::next_position(pos);
+    mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.column == 0);
+    assert(mtx_pos.row == 1);
+
+    pos = mtx_type::next_position(pos);
+    mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.column == 0);
+    assert(mtx_pos.row == 2);
+
+    pos = mtx_type::next_position(pos);
+    mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.column == 1);
+    assert(mtx_pos.row == 0);
+
+    pos = mtx_type::next_position(pos);
+    mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.column == 1);
+    assert(mtx_pos.row == 1);
+
+    pos = mtx_type::next_position(pos);
+    mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.column == 1);
+    assert(mtx_pos.row == 2);
+
+    pos = mtx_type::next_position(pos);
+    assert(pos == mtx.end_position());
+}
+
+void mtm_test_set_data_via_position()
+{
+    stack_printer __stack_printer__("::mtm_test_set_data_via_position");
+    mtx_type mtx(5, 4);
+    mtx_type::position_type pos = mtx.position(0, 1);
+    vector<double> data;
+    data.push_back(1.1);
+    data.push_back(1.2);
+    data.push_back(1.3);
+    data.push_back(1.4);
+    data.push_back(1.5);
+    pos = mtx.set(pos, data.begin(), data.end());
+    assert(mtx.get<double>(0, 1) == 1.1);
+    assert(mtx.get<double>(1, 1) == 1.2);
+    assert(mtx.get<double>(2, 1) == 1.3);
+    assert(mtx.get<double>(3, 1) == 1.4);
+    assert(mtx.get<double>(4, 1) == 1.5);
+
+    mtx_type::size_pair_type mtx_pos = mtx.matrix_position(pos);
+    assert(mtx_pos.row == 0);
+    assert(mtx_pos.column == 1);
+    pos = mtx.position(pos, 0, 2);
+    pos = mtx.set(pos, string("test"));
+    pos = mtx_type::next_position(pos);
+    pos = mtx.set(pos, true);
+    assert(mtx.get<string>(0, 2) == "test");
+    assert(mtx.get<bool>(1, 2) == true);
+}
+
+/**
+ * Measure the performance of object instantiation for filled storage.
+ */
+void mtm_perf_test_storage_creation()
+{
+    cout << "measuring performance on matrix object creation." << endl;
+    size_t rowsize = 5000;
+    size_t obj_count = 30000;
+    cout << "row size: " << rowsize << "  object count: " << obj_count << endl;
+    cout << "--- filled zero" << endl;
+    for (size_t colsize = 1; colsize <= 5; ++colsize)
+    {
+        stack_watch sw;
+        for (size_t i = 0; i < obj_count; ++i)
+            mtx_type mx(rowsize, colsize, 0.0);
+
+        cout << "column size: " << colsize << "  duration: " << sw.get_duration() << " sec" << endl;
+    }
+    cout << endl;
+}
+
+void mtm_perf_test_storage_set_numeric()
+{
+    cout << "measuring performance on matrix object creation and populating it with numeric data." << endl;
+    size_t rowsize = 3000;
+    size_t obj_count = 30000;
+    cout << "row size: " << rowsize << "  object count: " << obj_count << endl;
+    cout << "--- filled zero (individual insertion)" << endl;
+    for (size_t colsize = 1; colsize <= 5; ++colsize)
+    {
+        stack_watch sw;
+        for (size_t i = 0; i < obj_count; ++i)
+        {
+            mtx_type mx(rowsize, colsize, 0.0);
+            for (size_t row = 0; row < rowsize; ++row)
+            {
+                for (size_t col = 0; col < colsize; ++col)
+                    mx.set(row, col, 1.0);
+            }
+        }
+        cout << "column size: " << colsize << "  duration: " << sw.get_duration() << " sec" << endl;
+    }
+
+    cout << "--- filled zero (per column)" << endl;
+    for (size_t colsize = 1; colsize <= 5; ++colsize)
+    {
+        stack_watch sw;
+        for (size_t i = 0; i < obj_count; ++i)
+        {
+            mtx_type mx(rowsize, colsize, 0.0);
+            for (size_t col = 0; col < colsize; ++col)
+            {
+                vector<double> vals;
+                vals.reserve(rowsize);
+                for (size_t row = 0; row < rowsize; ++row)
+                    vals.push_back(1.0);
+                mx.set(0, col, vals.begin(), vals.end());
+            }
+        }
+        cout << "column size: " << colsize << "  duration: " << sw.get_duration() << " sec" << endl;
+    }
+
+    cout << "--- filled zero (per column, pre-filled array)" << endl;
+    for (size_t colsize = 1; colsize <= 5; ++colsize)
+    {
+        // Fill the data array before insertion.
+        vector<double> vals;
+        vals.reserve(rowsize);
+        for (size_t row = 0; row < rowsize; ++row)
+            vals.push_back(1.0);
+
+        stack_watch sw;
+        for (size_t i = 0; i < obj_count; ++i)
+        {
+            mtx_type mx(rowsize, colsize, 0.0);
+            for (size_t col = 0; col < colsize; ++col)
+                mx.set(0, col, vals.begin(), vals.end());
+        }
+        cout << "column size: " << colsize << "  duration: " << sw.get_duration() << " sec" << endl;
+    }
+
+    cout << "--- empty on creation (per column)" << endl;
+    for (size_t colsize = 1; colsize <= 5; ++colsize)
+    {
+        stack_watch sw;
+        for (size_t i = 0; i < obj_count; ++i)
+        {
+            mtx_type mx(rowsize, colsize);
+            for (size_t col = 0; col < colsize; ++col)
+            {
+                vector<double> vals;
+                vals.reserve(rowsize);
+                for (size_t row = 0; row < rowsize; ++row)
+                    vals.push_back(1.0);
+                mx.set(0, col, vals.begin(), vals.end());
+            }
+        }
+        cout << "column size: " << colsize << "  duration: " << sw.get_duration() << " sec" << endl;
+    }
+
+    cout << "--- empty on creation (per column, pre-filled array)" << endl;
+    for (size_t colsize = 1; colsize <= 5; ++colsize)
+    {
+        // Fill the data array before insertion.
+        vector<double> vals;
+        vals.reserve(rowsize);
+        for (size_t row = 0; row < rowsize; ++row)
+            vals.push_back(1.0);
+
+        stack_watch sw;
+        for (size_t i = 0; i < obj_count; ++i)
+        {
+            mtx_type mx(rowsize, colsize);
+            for (size_t col = 0; col < colsize; ++col)
+                mx.set(0, col, vals.begin(), vals.end());
+        }
+        cout << "column size: " << colsize << "  duration: " << sw.get_duration() << " sec" << endl;
+    }
+
+    cout << endl;
+}
+
+struct sum_all_values
+{
+    double result;
+
+    sum_all_values() : result(0.0)
+    {}
+
+    void operator()(const mtx_type::element_block_node_type& blk)
+    {
+        mtv::double_element_block::const_iterator it = mtv::double_element_block::cbegin(*blk.data);
+        mtv::double_element_block::const_iterator it_end = mtv::double_element_block::cend(*blk.data);
+        for (; it != it_end; ++it)
+            result += *it;
+    }
+};
+
+void mtm_perf_test_iterate_elements()
+{
+    cout << "measuring performance on iterating over all numeric elements." << endl;
+    size_t rowsize = 100000;
+    size_t colsize = 1000;
+    cout << "row size: " << rowsize << "  column size: " << colsize << endl;
+    mtx_type mx(rowsize, colsize, 0.0);
+    {
+        stack_watch sw;
+        double val = 1.0;
+        std::vector<double> vals;
+        vals.reserve(rowsize * colsize);
+        for (size_t i = 0; i < rowsize; ++i)
+        {
+            for (size_t j = 0; j < colsize; ++j)
+            {
+                vals.push_back(val);
+                val += 0.001;
+            }
+        }
+        mx.set(0, 0, vals.begin(), vals.end());
+        cout << "element values inserted.  (duration: " << sw.get_duration() << " sec)" << endl;
+    }
+
+    {
+        stack_watch sw;
+        sum_all_values func;
+        mx.walk(func);
+        double val = func.result;
+        cout << "all element values added.  (answer: " << val << ")  (duration: " << sw.get_duration() << " sec)"
+             << endl;
+    }
+}
+
+void mtm_perf_test_insert_via_position_object()
+{
+    size_t rowsize = 3000, colsize = 3000;
+    {
+        stack_printer __stack_printer__("::mtm_perf_test_insert_via_position_object (column and row positions)");
+        mtx_type mx(rowsize, colsize);
+        for (size_t i = 0; i < rowsize; ++i)
+        {
+            for (size_t j = 0; j < colsize; ++j)
+            {
+                mx.set(i, j, 1.1);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer__("::mtm_perf_test_insert_via_position_object (position object)");
+        mtx_type mx(rowsize, colsize);
+        mtx_type::position_type pos = mx.position(0, 0);
+        for (size_t i = 0; i < rowsize; ++i)
+        {
+            for (size_t j = 0; j < colsize; ++j)
+            {
+                pos = mx.set(pos, 1.1);
+                pos = mtx_type::next_position(pos);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer__("::mtm_perf_test_insert_via_position_object (position object)");
+        mtx_type mx(rowsize, colsize);
+        mtx_type::position_type pos = mx.position(0, 0);
+        for (; pos != mx.end_position(); pos = mtx_type::next_position(pos))
+            pos = mx.set(pos, 1.1);
+    }
+}
+
+int main(int argc, char** argv)
+{
+    try
+    {
+        cmd_options opt;
+        if (!parse_cmd_options(argc, argv, opt))
+            return EXIT_FAILURE;
+
+        if (opt.test_func)
+        {
+            mtm_test_construction();
+            mtm_test_data_insertion();
+            mtm_test_data_insertion_multiple();
+            mtm_test_data_insertion_integer();
+            mtm_test_set_empty();
+            mtm_test_swap();
+            mtm_test_transpose();
+            mtm_test_resize();
+            mtm_test_copy();
+            mtm_test_copy_empty_destination();
+            mtm_test_copy_from_array();
+            mtm_test_assignment();
+            mtm_test_numeric();
+            mtm_test_custom_string();
+            mtm_test_position();
+            mtm_test_set_data_via_position();
+        }
+
+        if (opt.test_perf)
+        {
+            mtm_perf_test_storage_creation();
+            mtm_perf_test_storage_set_numeric();
+            mtm_perf_test_iterate_elements();
+            mtm_perf_test_insert_via_position_object();
+        }
+    }
+    catch (const std::exception& e)
+    {
+        fprintf(stdout, "Test failed: %s\n", e.what());
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_matrix/test_walk.cpp b/test/multi_type_matrix/test_walk.cpp
new file mode 100644
index 0000000..5bb4e9f
--- /dev/null
+++ b/test/multi_type_matrix/test_walk.cpp
@@ -0,0 +1,640 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2012-2016 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+#include <mdds/multi_type_matrix.hpp>
+
+#include <string>
+#include <ostream>
+#include <memory>
+
+using namespace mdds;
+using namespace std;
+
+// Standard matrix that uses std::string as its string type.
+typedef multi_type_matrix<mtm::std_string_traits> mtx_type;
+
+inline std::ostream& operator<<(std::ostream& os, const mtx_type::element_block_node_type& node)
+{
+    os << "(type=" << node.type << "; offset=" << node.offset << "; size=" << node.size << ")";
+    return os;
+}
+
+template<typename _T>
+struct print_element
+{
+    void operator()(const _T& v) const
+    {
+        cout << v << endl;
+    }
+};
+
+class walk_element_block
+{
+    size_t m_node_count = 0;
+
+public:
+    void operator()(const mtx_type::element_block_node_type& node)
+    {
+        switch (node.type)
+        {
+            case mtm::element_boolean:
+            {
+                mtx_type::boolean_block_type::const_iterator it = mtx_type::boolean_block_type::begin(*node.data);
+                std::advance(it, node.offset);
+                mtx_type::boolean_block_type::const_iterator it_end = it;
+                std::advance(it_end, node.size);
+                std::for_each(it, it_end, print_element<bool>());
+            }
+            break;
+            case mtm::element_string:
+            {
+                mtx_type::string_block_type::const_iterator it = mtx_type::string_block_type::begin(*node.data);
+                std::advance(it, node.offset);
+                mtx_type::string_block_type::const_iterator it_end = it;
+                std::advance(it_end, node.size);
+                std::for_each(it, it_end, print_element<mtx_type::string_type>());
+            }
+            break;
+            case mtm::element_numeric:
+            {
+                mtx_type::numeric_block_type::const_iterator it = mtx_type::numeric_block_type::begin(*node.data);
+                std::advance(it, node.offset);
+                mtx_type::numeric_block_type::const_iterator it_end = it;
+                std::advance(it_end, node.size);
+                std::for_each(it, it_end, print_element<double>());
+            }
+            break;
+            case mtm::element_empty:
+                cout << "- empty block -" << endl;
+                break;
+            default:;
+        }
+
+        ++m_node_count;
+    }
+
+    size_t get_node_count() const
+    {
+        return m_node_count;
+    }
+};
+
+class walk_element_block_move_only
+{
+    size_t m_node_count = 0;
+
+public:
+    walk_element_block_move_only()
+    {}
+
+    walk_element_block_move_only(walk_element_block_move_only&& other) : m_node_count(other.m_node_count)
+    {
+        other.m_node_count = 0;
+    }
+
+    walk_element_block_move_only& operator=(walk_element_block_move_only&& other)
+    {
+        m_node_count = other.m_node_count;
+        other.m_node_count = 0;
+        return *this;
+    }
+
+    void operator()(const mtx_type::element_block_node_type& /*node*/)
+    {
+        ++m_node_count;
+    }
+
+    size_t get_node_count() const
+    {
+        return m_node_count;
+    }
+};
+
+void mtm_test_walk()
+{
+    stack_printer __stack_printer__("::mtm_test_walk");
+    mtx_type mtx(12, 1); // single column matrix to make it easier.
+    mtx.set(2, 0, 1.1);
+    mtx.set(3, 0, 1.2);
+    mtx.set(4, 0, 1.3);
+    mtx.set(5, 0, 1.4);
+    mtx.set(7, 0, string("A"));
+    mtx.set(8, 0, string("B"));
+    mtx.set(9, 0, string("C"));
+    mtx.set(10, 0, false);
+    mtx.set(11, 0, true);
+    walk_element_block func;
+    func = mtx.walk(func);
+    assert(func.get_node_count() == 5);
+
+    walk_element_block_move_only func_mo;
+    func_mo = mtx.walk(std::move(func_mo));
+    assert(func_mo.get_node_count() == 5);
+}
+
+void mtm_test_walk_subset()
+{
+    {
+        stack_printer __stack_printer__("::mtm_test_walk_subset test1");
+        mtx_type mtx(4, 4);
+        mtx.set(1, 1, 1.1);
+        mtx.set(2, 1, 1.2);
+        mtx.set(3, 1, 1.3);
+        mtx.set(0, 2, string("A1"));
+        mtx.set(1, 2, string("A2"));
+        mtx.set(2, 2, false);
+        walk_element_block func;
+        func = mtx.walk(func, mtx_type::size_pair_type(1, 1), mtx_type::size_pair_type(2, 2));
+        assert(func.get_node_count() == 3);
+    }
+    {
+        stack_printer __stack_printer__("::mtm_test_walk_subset test2");
+        mtx_type mtx(4, 4);
+        mtx.set(0, 1, 1.0);
+        mtx.set(1, 1, 1.1);
+        mtx.set(0, 2, string("A1"));
+        mtx.set(1, 2, string("A2"));
+        mtx.set(2, 2, string("A3"));
+        mtx.set(3, 2, string("A4"));
+        walk_element_block func;
+        func = mtx.walk(func, mtx_type::size_pair_type(1, 1), mtx_type::size_pair_type(2, 2));
+        assert(func.get_node_count() == 3);
+    }
+}
+
+template<typename _Blk>
+void push_to_buffer(const mtx_type::element_block_node_type& node, std::vector<string>& buf)
+{
+    auto it = node.begin<_Blk>();
+    auto ite = node.end<_Blk>();
+    std::for_each(it, ite, [&](const typename _Blk::value_type& v) {
+        ostringstream os;
+        os << v;
+        buf.push_back(os.str());
+    });
+}
+
+template<>
+void push_to_buffer<mtx_type::boolean_block_type>(
+    const mtx_type::element_block_node_type& node, std::vector<string>& buf)
+{
+    using blk_type = mtx_type::boolean_block_type;
+    auto it = node.begin<blk_type>();
+    auto ite = node.end<blk_type>();
+    std::for_each(it, ite, [&](bool v) {
+        ostringstream os;
+        os << (v ? "true" : "false");
+        buf.push_back(os.str());
+    });
+}
+
+class parallel_walk_element_block
+{
+    using strlist_type = std::vector<string>;
+
+    std::string m_name;
+    std::shared_ptr<strlist_type> m_ls;
+    std::shared_ptr<strlist_type> m_rs;
+
+    void process_node(const mtx_type::element_block_node_type& node, strlist_type& buf)
+    {
+        switch (node.type)
+        {
+            case mtm::element_boolean:
+                push_to_buffer<mtx_type::boolean_block_type>(node, buf);
+                break;
+            case mtm::element_string:
+                push_to_buffer<mtx_type::string_block_type>(node, buf);
+                break;
+            case mtm::element_numeric:
+                push_to_buffer<mtx_type::numeric_block_type>(node, buf);
+                break;
+            case mtm::element_empty:
+                for (size_t i = 0; i < node.size; ++i)
+                    buf.push_back("' '");
+                break;
+            default:;
+        }
+    }
+
+public:
+    parallel_walk_element_block(std::string name)
+        : m_name(std::move(name)), m_ls(std::make_shared<strlist_type>()), m_rs(std::make_shared<strlist_type>())
+    {}
+    parallel_walk_element_block(const parallel_walk_element_block& other)
+        : m_name(other.m_name), m_ls(other.m_ls), m_rs(other.m_rs)
+    {}
+    parallel_walk_element_block(parallel_walk_element_block&& other)
+        : m_name(std::move(other.m_name)), m_ls(std::move(other.m_ls)), m_rs(std::move(other.m_rs))
+    {}
+
+    parallel_walk_element_block& operator=(parallel_walk_element_block other)
+    {
+        swap(other);
+        return *this;
+    }
+
+    void swap(parallel_walk_element_block& other)
+    {
+        m_ls.swap(other.m_ls);
+        m_rs.swap(other.m_rs);
+    }
+
+    void operator()(const mtx_type::element_block_node_type& left, const mtx_type::element_block_node_type& right)
+    {
+        cout << "--" << endl;
+        cout << "l: " << left << endl;
+        cout << "r: " << right << endl;
+        process_node(left, *m_ls);
+        process_node(right, *m_rs);
+    }
+
+    strlist_type get_concat_buffer() const
+    {
+        strlist_type buf;
+        assert(m_ls->size() == m_rs->size());
+        auto it = m_ls->begin(), it2 = m_rs->begin();
+        auto ite = m_ls->end();
+        for (; it != ite; ++it, ++it2)
+        {
+            ostringstream os;
+            os << *it << ":" << *it2;
+            buf.push_back(os.str());
+        }
+
+        return buf;
+    }
+
+    void clear()
+    {
+        m_ls->clear();
+        m_rs->clear();
+    }
+
+    const std::string& get_name() const
+    {
+        return m_name;
+    }
+
+    void set_name(std::string name)
+    {
+        m_name = std::move(name);
+    }
+};
+
+bool check_concat_buffer(std::vector<string> concat, const char* expected[], size_t expected_size)
+{
+    if (concat.size() != expected_size)
+    {
+        cerr << "expected size: " << expected_size << ", actual size: " << concat.size() << endl;
+        return false;
+    }
+
+    for (size_t i = 0; i < expected_size; ++i)
+    {
+        if (concat[i] != expected[i])
+        {
+            cerr << i << ": expected value: " << expected[i] << ", actual value: " << concat[i] << endl;
+            return false;
+        }
+    }
+
+    return true;
+}
+
+void mtm_test_parallel_walk()
+{
+    stack_printer __stack_printer__("::mtm_test_parallel_walk");
+
+    parallel_walk_element_block func("test0");
+    mtx_type left(10, 1), right(10, 1, string("'+'"));
+
+    right.set(2, 0, 1.2);
+    right.set(8, 0, false);
+    right.set(9, 0, true);
+
+    left.set(0, 0, 122.0);
+    left.set(4, 0, string("A12"));
+    left.set(5, 0, string("A25"));
+
+    {
+        func = left.walk(func, right);
+        assert(func.get_name() == "test0");
+
+        const char* expected[] = {
+            "122:'+'", "' ':'+'", "' ':1.2", "' ':'+'",   "A12:'+'",
+            "A25:'+'", "' ':'+'", "' ':'+'", "' ':false", "' ':true",
+        };
+
+        size_t n = std::size(expected);
+        assert(check_concat_buffer(func.get_concat_buffer(), expected, n));
+    }
+
+    func.clear();
+
+    {
+        func.set_name("test0-2");
+        func = left.walk(func, right, mtx_type::size_pair_type(2, 0), mtx_type::size_pair_type(8, 0));
+        assert(func.get_name() == "test0-2");
+
+        const char* expected[] = {
+            "' ':1.2", "' ':'+'", "A12:'+'", "A25:'+'", "' ':'+'", "' ':'+'", "' ':false",
+        };
+
+        size_t n = std::size(expected);
+        assert(check_concat_buffer(func.get_concat_buffer(), expected, n));
+    }
+
+    func.clear();
+
+    {
+        // Only one row.
+        func.set_name("test0-3");
+        func = left.walk(func, right, mtx_type::size_pair_type(4, 0), mtx_type::size_pair_type(4, 0));
+        assert(func.get_name() == "test0-3");
+
+        const char* expected[] = {
+            "A12:'+'",
+        };
+
+        size_t n = std::size(expected);
+        assert(check_concat_buffer(func.get_concat_buffer(), expected, n));
+    }
+}
+
+void mtm_test_parallel_walk_non_equal_size()
+{
+    stack_printer __stack_printer__("::mtm_test_parallel_walk_non_equal_size");
+
+    mtx_type left(3, 3), right(2, 2);
+
+    left.set(0, 0, 10.0);
+    left.set(1, 0, 20.0);
+    left.set(2, 0, 30.0);
+    left.set(0, 1, 40.0);
+    left.set(1, 1, 50.0);
+    left.set(2, 1, 60.0);
+    left.set(0, 2, 70.0);
+    left.set(1, 2, 80.0);
+    left.set(2, 2, 90.0);
+
+    right.set(0, 0, string("A"));
+    right.set(1, 0, string("B"));
+    right.set(0, 1, string("C"));
+    right.set(1, 1, string("D"));
+
+    {
+        // Only walk the top-left 2x2 range.
+        parallel_walk_element_block func("test1");
+        func = left.walk(func, right, mtx_type::size_pair_type(0, 0), mtx_type::size_pair_type(1, 1));
+        assert(func.get_name() == "test1");
+
+        const char* expected[] = {
+            "10:A",
+            "20:B",
+            "40:C",
+            "50:D",
+        };
+
+        size_t n = std::size(expected);
+        assert(check_concat_buffer(func.get_concat_buffer(), expected, n));
+    }
+
+    // Break up the blocks a little.
+    left.set(1, 0, true);
+    left.set(0, 1, false);
+    right.set(0, 0, -99.0);
+    right.set(1, 1, -9.9);
+
+    {
+        // Only walk the top-left 2x2 range.
+        parallel_walk_element_block func("test2");
+        func = left.walk(func, right, mtx_type::size_pair_type(0, 0), mtx_type::size_pair_type(1, 1));
+        assert(func.get_name() == "test2");
+
+        const char* expected[] = {
+            "10:-99",
+            "true:B",
+            "false:C",
+            "50:-9.9",
+        };
+
+        size_t n = std::size(expected);
+        assert(check_concat_buffer(func.get_concat_buffer(), expected, n));
+    }
+}
+
+/**
+ * Make sure the walk methods can take lambdas.
+ */
+void mtm_test_walk_with_lambda()
+{
+    stack_printer __stack_printer__("::mtm_test_walk_with_lambda");
+    vector<double> values = {1.1, 1.2, 1.3, 1.4};
+    mtx_type mtx(2, 2, values.begin(), values.end());
+
+    mtx.walk([](const mtx_type::element_block_node_type& node) {
+        assert(node.type == mdds::mtm::element_numeric);
+        assert(node.offset == 0);
+        assert(node.size == 4);
+    });
+
+    struct section
+    {
+        mdds::mtm::element_t type;
+        size_t offset;
+        size_t size;
+
+        bool operator==(const section& other) const
+        {
+            return type == other.type && offset == other.offset && size == other.size;
+        }
+    };
+
+    std::vector<section> expected = {
+        {mdds::mtm::element_numeric, 0, 1},
+        {mdds::mtm::element_numeric, 2, 1},
+    };
+
+    std::vector<section> actual;
+
+    mtx.walk(
+        [&](const mtx_type::element_block_node_type& node) {
+            actual.emplace_back();
+            actual.back().type = node.type;
+            actual.back().offset = node.offset;
+            actual.back().size = node.size;
+        },
+        {0, 0}, {0, 1} // (row=0, column=0) to (row=0, column=1)
+    );
+
+    assert(expected == actual);
+}
+
+void mtm_test_parallel_walk_with_lambda()
+{
+    stack_printer __stack_printer__("::mtm_test_parallel_walk_with_lambda");
+
+    vector<double> values = {1.1, 1.2, 1.3, 1.4};
+    mtx_type mtx1(2, 2, values.begin(), values.end());
+
+    mtx_type mtx2(2, 2);
+    mtx2.set(0, 0, 2.2);
+    mtx2.set(1, 0, 2.5);
+    mtx2.set(0, 1, true);
+    mtx2.set(1, 1, false);
+
+    struct section
+    {
+        mdds::mtm::element_t type;
+        size_t offset;
+        size_t size;
+
+        bool operator==(const section& other) const
+        {
+            return type == other.type && offset == other.offset && size == other.size;
+        }
+    };
+
+    struct section_pair
+    {
+        section left;
+        section right;
+
+        bool operator==(const section_pair& other) const
+        {
+            return left == other.left && right == other.right;
+        }
+    };
+
+    std::vector<section_pair> expected = {
+        {{mdds::mtm::element_numeric, 0, 2}, {mdds::mtm::element_numeric, 0, 2}},
+        {{mdds::mtm::element_numeric, 2, 2}, {mdds::mtm::element_boolean, 0, 2}},
+    };
+
+    std::vector<section_pair> actual;
+
+    cout << "--" << endl;
+
+    mtx1.walk(
+        [&](const mtx_type::element_block_node_type& l, const mtx_type::element_block_node_type& r) {
+            cout << "left: " << l << "; right: " << r << endl;
+            actual.emplace_back();
+            actual.back().left.type = l.type;
+            actual.back().left.offset = l.offset;
+            actual.back().left.size = l.size;
+            actual.back().right.type = r.type;
+            actual.back().right.offset = r.offset;
+            actual.back().right.size = r.size;
+        },
+        mtx2);
+
+    assert(expected == actual);
+
+    mtx_type mtx3(4, 4, 1.0), mtx4(4, 4, std::string("A"));
+    mtx3.set(2, 0, true);
+    mtx3.set(3, 0, true);
+    mtx4.set(0, 1, 2.2);
+    mtx4.set(1, 1, 2.3);
+    mtx4.set(0, 2, 1.1);
+    mtx4.set(1, 2, 1.1);
+    mtx3.set(1, 2, true);
+    mtx3.set(2, 2, false);
+
+    expected = {
+        {{mdds::mtm::element_numeric, 0, 2}, {mdds::mtm::element_string, 0, 2}},
+        {{mdds::mtm::element_boolean, 0, 1}, {mdds::mtm::element_string, 2, 1}},
+
+        {{mdds::mtm::element_numeric, 0, 2}, {mdds::mtm::element_numeric, 0, 2}},
+        {{mdds::mtm::element_numeric, 2, 1}, {mdds::mtm::element_string, 0, 1}},
+
+        {{mdds::mtm::element_numeric, 4, 1}, {mdds::mtm::element_numeric, 0, 1}},
+        {{mdds::mtm::element_boolean, 0, 1}, {mdds::mtm::element_numeric, 1, 1}},
+        {{mdds::mtm::element_boolean, 1, 1}, {mdds::mtm::element_string, 0, 1}},
+    };
+
+    actual.clear();
+
+    cout << "--" << endl;
+
+    mtx3.walk(
+        [&](const mtx_type::element_block_node_type& l, const mtx_type::element_block_node_type& r) {
+            cout << "left: " << l << "; right: " << r << endl;
+            actual.emplace_back();
+            actual.back().left.type = l.type;
+            actual.back().left.offset = l.offset;
+            actual.back().left.size = l.size;
+            actual.back().right.type = r.type;
+            actual.back().right.offset = r.offset;
+            actual.back().right.size = r.size;
+        },
+        mtx4, {0, 0}, {2, 2});
+
+    assert(expected.size() == actual.size());
+    assert(expected[0] == actual[0]);
+    assert(expected[1] == actual[1]);
+    assert(expected[2] == actual[2]);
+    assert(expected[3] == actual[3]);
+    assert(expected[4] == actual[4]);
+    assert(expected[5] == actual[5]);
+    assert(expected[6] == actual[6]);
+}
+
+int main(int argc, char** argv)
+{
+    try
+    {
+        cmd_options opt;
+        if (!parse_cmd_options(argc, argv, opt))
+            return EXIT_FAILURE;
+
+        if (opt.test_func)
+        {
+            mtm_test_walk();
+            mtm_test_walk_subset();
+            mtm_test_parallel_walk();
+            mtm_test_parallel_walk_non_equal_size();
+            mtm_test_walk_with_lambda();
+            mtm_test_parallel_walk_with_lambda();
+        }
+
+        if (opt.test_perf)
+        {
+            // no perf test yet.
+        }
+    }
+    catch (const std::exception& e)
+    {
+        fprintf(stdout, "Test failed: %s\n", e.what());
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_vector/Makefile.am b/test/multi_type_vector/Makefile.am
new file mode 100644
index 0000000..19956de
--- /dev/null
+++ b/test/multi_type_vector/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = collection custom custom-trait debug-util default element-blocks event perf
diff --git a/test/multi_type_vector/Makefile.in b/test/multi_type_vector/Makefile.in
new file mode 100644
index 0000000..8793bb0
--- /dev/null
+++ b/test/multi_type_vector/Makefile.in
@@ -0,0 +1,638 @@
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+am__global_test_result_rx = ^[ 	]*:global-test-result:[ 	]*
+am__copy_in_global_log_rx = ^[ 	]*:copy-in-global-log:[ 	]*
+# A command that, given a newline-separated list of test names on the
+# standard input, print the name of the tests that are to be re-run
+# upon "make recheck".
+am__list_recheck_tests = $(AWK) '{ \
+  recheck = 1; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
+    { \
+      if (rc < 0) \
+        { \
+          if ((getline line2 < ($$0 ".log")) < 0) \
+	    recheck = 0; \
+          break; \
+        } \
+      else if (line ~ /$(am__recheck_rx)[nN][Oo]/) \
+        { \
+          recheck = 0; \
+          break; \
+        } \
+      else if (line ~ /$(am__recheck_rx)[yY][eE][sS]/) \
+        { \
+          break; \
+        } \
+    }; \
+  if (recheck) \
+    print $$0; \
+  close ($$0 ".trs"); \
+  close ($$0 ".log"); \
+}'
+# A command that, given a newline-separated list of test names on the
+# standard input, create the global log from their .trs and .log files.
+am__create_global_log = $(AWK) ' \
+function fatal(msg) \
+{ \
+  print "fatal: making $@: " msg | "cat >&2"; \
+  exit 1; \
+} \
+function rst_section(header) \
+{ \
+  print header; \
+  len = length(header); \
+  for (i = 1; i <= len; i = i + 1) \
+    printf "="; \
+  printf "\n\n"; \
+} \
+{ \
+  copy_in_global_log = 1; \
+  global_test_result = "RUN"; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
+    { \
+      if (rc < 0) \
+         fatal("failed to read from " $$0 ".trs"); \
+      if (line ~ /$(am__global_test_result_rx)/) \
+        { \
+          sub("$(am__global_test_result_rx)", "", line); \
+          sub("[ 	]*$$", "", line); \
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+        } \
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+        copy_in_global_log = 0; \
+    }; \
+  if (copy_in_global_log) \
+    { \
+      rst_section(global_test_result ": " $$0); \
+      while ((rc = (getline line < ($$0 ".log"))) != 0) \
+      { \
+        if (rc < 0) \
+          fatal("failed to read from " $$0 ".log"); \
+        print line; \
+      }; \
+      printf "\n"; \
+    }; \
+  close ($$0 ".trs"); \
+  close ($$0 ".log"); \
+}'
+# Restructured Text title.
+am__rst_title = { sed 's/.*/   &   /;h;s/./=/g;p;x;s/ *$$//;p;g' && echo; }
+# Solaris 10 'make', and several other traditional 'make' implementations,
+# pass "-e" to $(SHELL), and POSIX 2008 even requires this.  Work around it
+# by disabling -e (using the XSI extension "set +e") if it's set.
+am__sh_e_setup = case $$- in *e*) set +e;; esac
+# Default flags passed to test drivers.
+am__common_driver_flags = \
+  --color-tests "$$am__color_tests" \
+  --enable-hard-errors "$$am__enable_hard_errors" \
+  --expect-failure "$$am__expect_failure"
+# To be inserted before the command running the test.  Creates the
+# directory for the log if needed.  Stores in $dir the directory
+# containing $f, in $tst the test, in $log the log.  Executes the
+# developer- defined test setup AM_TESTS_ENVIRONMENT (if any), and
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+# thy have one).
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+$(am__sh_e_setup);					\
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+srcdir=$(srcdir); export srcdir;			\
+case "$@" in						\
+  */*) am__odir=`echo "./$@" | sed 's|/[^/]*$$||'`;;	\
+    *) am__odir=.;; 					\
+esac;							\
+test "x$$am__odir" = x"." || test -d "$$am__odir" 	\
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+elif test -f "$$f"; then dir=;				\
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+tst=$$dir$$f; log='$@'; 				\
+if test -n '$(DISABLE_HARD_ERRORS)'; then		\
+  am__enable_hard_errors=no; 				\
+else							\
+  am__enable_hard_errors=yes; 				\
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+  *[\ \	]$$f[\ \	]* | *[\ \	]$$dir$$f[\ \	]*) \
+    am__expect_failure=yes;;				\
+  *)							\
+    am__expect_failure=no;;				\
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+# '$bases'.  This honors runtime overriding of TESTS and TEST_LOGS.  Sadly,
+# we cannot use something simpler, involving e.g., "$(TEST_LOGS:.log=)",
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+# See also 'test-harness-vpath-rewrite.sh' and 'test-trs-basic.sh'.
+am__set_TESTS_bases = \
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+AM_TESTSUITE_SUMMARY_HEADER = ' for $(PACKAGE_STRING)'
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+AM_RECURSIVE_TARGETS = check recheck
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+am__set_b = \
+  case '$@' in \
+    */*) \
+      case '$*' in \
+        */*) b='$*';; \
+          *) b=`echo '$@' | sed 's/\.log$$//'`; \
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+    *) \
+      b='$*';; \
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+top_srcdir = @top_srcdir@
+valgrind_enabled_tools = @valgrind_enabled_tools@
+valgrind_tools = @valgrind_tools@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
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+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_main_CPPFLAGS = \
+	-I$(srcdir)/.. \
+	-I$(srcdir)/../tc \
+	$(AM_CPPFLAGS)
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .cpp .log .o .obj .test .test$(EXEEXT) .trs
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
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+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/multi_type_vector/collection/aos/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/multi_type_vector/collection/aos/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-checkPROGRAMS:
+	-test -z "$(check_PROGRAMS)" || rm -f $(check_PROGRAMS)
+$(top_builddir)/test/$(am__dirstamp):
+	@$(MKDIR_P) $(top_builddir)/test
+	@: > $(top_builddir)/test/$(am__dirstamp)
+$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) $(top_builddir)/test/$(DEPDIR)
+	@: > $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+$(top_builddir)/test/test_main-test_global.$(OBJEXT):  \
+	$(top_builddir)/test/$(am__dirstamp) \
+	$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+
+test-main$(EXEEXT): $(test_main_OBJECTS) $(test_main_DEPENDENCIES) $(EXTRA_test_main_DEPENDENCIES) 
+	@rm -f test-main$(EXEEXT)
+	$(AM_V_CXXLD)$(CXXLINK) $(test_main_OBJECTS) $(test_main_LDADD) $(LIBS)
+
+mostlyclean-compile:
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+am--depfiles: $(am__depfiles_remade)
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+ID: $(am__tagged_files)
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+	  if test $$# -gt 0; then \
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+	     $$unique
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+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
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+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
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+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
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+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
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+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
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+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
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+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
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+	exit $$?;
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+
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+	-test -z "$(top_builddir)/test/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(am__dirstamp)
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diff --git a/test/multi_type_vector/collection/aos/test_main.cpp b/test/multi_type_vector/collection/aos/test_main.cpp
new file mode 100644
index 0000000..41eb8b5
--- /dev/null
+++ b/test/multi_type_vector/collection/aos/test_main.cpp
@@ -0,0 +1,67 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2016-2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/aos/main.hpp>
+#include <mdds/multi_type_vector/collection.hpp>
+
+#include <iostream>
+#include <vector>
+#include <deque>
+#include <memory>
+
+using mtv_type = mdds::mtv::aos::multi_type_vector<mdds::mtv::standard_element_blocks_traits>;
+using cols_type = mdds::mtv::collection<mtv_type>;
+
+#include "all.inl"
+
+int main()
+{
+    try
+    {
+        mtv_test_empty();
+        mtv_test_pointer_size1();
+        mtv_test_unique_pointer_size1();
+        mtv_test_shared_pointer_size2();
+        mtv_test_non_pointer_size1();
+        mtv_test_invalid_collection();
+        mtv_test_sub_element_ranges();
+        mtv_test_sub_element_ranges_invalid();
+        mtv_test_sub_collection_ranges_invalid();
+        mtv_test_boolean_block();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_vector/collection/soa/Makefile.am b/test/multi_type_vector/collection/soa/Makefile.am
new file mode 100644
index 0000000..c4b4f95
--- /dev/null
+++ b/test/multi_type_vector/collection/soa/Makefile.am
@@ -0,0 +1,19 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = test-main
+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_main_CPPFLAGS = \
+	-I$(srcdir)/.. \
+	-I$(srcdir)/../tc \
+	$(AM_CPPFLAGS)
+
+TESTS = test-main
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/multi_type_vector/collection/soa/Makefile.in b/test/multi_type_vector/collection/soa/Makefile.in
new file mode 100644
index 0000000..294229e
--- /dev/null
+++ b/test/multi_type_vector/collection/soa/Makefile.in
@@ -0,0 +1,1028 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
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+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
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+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
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diff --git a/test/multi_type_vector/collection/soa/test_main.cpp b/test/multi_type_vector/collection/soa/test_main.cpp
new file mode 100644
index 0000000..f2f0154
--- /dev/null
+++ b/test/multi_type_vector/collection/soa/test_main.cpp
@@ -0,0 +1,67 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/soa/main.hpp>
+#include <mdds/multi_type_vector/collection.hpp>
+
+#include <iostream>
+#include <vector>
+#include <deque>
+#include <memory>
+
+using mtv_type = mdds::mtv::soa::multi_type_vector<mdds::mtv::standard_element_blocks_traits>;
+using cols_type = mdds::mtv::collection<mtv_type>;
+
+#include "all.inl"
+
+int main()
+{
+    try
+    {
+        mtv_test_empty();
+        mtv_test_pointer_size1();
+        mtv_test_unique_pointer_size1();
+        mtv_test_shared_pointer_size2();
+        mtv_test_non_pointer_size1();
+        mtv_test_invalid_collection();
+        mtv_test_sub_element_ranges();
+        mtv_test_sub_element_ranges_invalid();
+        mtv_test_sub_collection_ranges_invalid();
+        mtv_test_boolean_block();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_vector/collection/tc/Makefile.am b/test/multi_type_vector/collection/tc/Makefile.am
new file mode 100644
index 0000000..fa2214a
--- /dev/null
+++ b/test/multi_type_vector/collection/tc/Makefile.am
@@ -0,0 +1 @@
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diff --git a/test/multi_type_vector/collection/tc/Makefile.in b/test/multi_type_vector/collection/tc/Makefile.in
new file mode 100644
index 0000000..0a56a42
--- /dev/null
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@@ -0,0 +1,460 @@
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+	check-valgrind-sgcheck-local clean clean-generic cscopelist-am \
+	ctags-am distclean distclean-generic distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic pdf \
+	pdf-am ps ps-am tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/collection/tc/all.inl b/test/multi_type_vector/collection/tc/all.inl
new file mode 100644
index 0000000..8c78c3e
--- /dev/null
+++ b/test/multi_type_vector/collection/tc/all.inl
@@ -0,0 +1,394 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_empty()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    cols_type empty;
+    assert(empty.begin() == empty.end());
+}
+
+void mtv_test_pointer_size1()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // Two vectors of size 1, both of which are totally empty.
+
+    std::vector<mtv_type*> vectors;
+    for (size_t i = 0; i < 2; ++i)
+        vectors.push_back(new mtv_type(1));
+
+    cols_type collection(vectors.begin(), vectors.end());
+    cols_type::const_iterator it, ite;
+    it = collection.begin();
+    ite = collection.end();
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert((it++)->index == 0);
+    assert(it != ite);
+
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->index == 1);
+
+    assert(++it == ite);
+
+    for_each(vectors.begin(), vectors.end(), [](const mtv_type* p) { delete p; });
+}
+
+void mtv_test_unique_pointer_size1()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // Two vector of size 1, with empty and numeric values.
+
+    std::vector<std::unique_ptr<mtv_type>> vectors;
+    for (size_t i = 0; i < 2; ++i)
+        vectors.push_back(std::make_unique<mtv_type>(1));
+
+    vectors[1]->set(0, 1.1);
+
+    cols_type collection(vectors.begin(), vectors.end());
+    cols_type::const_iterator it = collection.begin(), ite = collection.end();
+    assert((*it).type == mdds::mtv::element_type_empty);
+    assert((*it).index == 0);
+
+    ++it;
+    assert((*it).type == mdds::mtv::element_type_double);
+    assert((*it).index == 1);
+    assert(it->get<mdds::mtv::double_element_block>() == 1.1);
+
+    assert(++it == ite);
+}
+
+void mtv_test_shared_pointer_size2()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    std::vector<std::shared_ptr<mtv_type>> vectors;
+    vectors.push_back(std::make_shared<mtv_type>(2, 2.3));
+    vectors.push_back(std::make_shared<mtv_type>(2, std::string("test")));
+
+    cols_type collection(vectors.begin(), vectors.end());
+    assert(collection.size() == 2);
+
+    cols_type::const_iterator it = collection.begin();
+
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->index == 0);
+    assert(it->position == 0);
+    assert(it->get<mdds::mtv::double_element_block>() == 2.3);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->index == 1);
+    assert(it->position == 0);
+    assert(it->get<mdds::mtv::string_element_block>() == "test");
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->index == 0);
+    assert(it->position == 1);
+    assert(it->get<mdds::mtv::double_element_block>() == 2.3);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->index == 1);
+    assert(it->position == 1);
+    assert(it->get<mdds::mtv::string_element_block>() == "test");
+
+    assert(++it == collection.end());
+}
+
+void mtv_test_non_pointer_size1()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // Test 1 by 1 grid.
+
+    std::vector<mtv_type> vectors;
+    vectors.reserve(1);
+    vectors.emplace_back(1, int8_t('c'));
+
+    cols_type collection(vectors.begin(), vectors.end());
+    assert(collection.size() == 1);
+
+    auto it = collection.begin();
+    assert(it->type == mdds::mtv::element_type_int8);
+    assert(it->index == 0);
+    assert(it->position == 0);
+    assert(it->get<mdds::mtv::int8_element_block>() == 'c');
+
+    assert(++it == collection.end());
+}
+
+void mtv_test_invalid_collection()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    std::vector<mtv_type> vectors;
+    vectors.reserve(2);
+    vectors.emplace_back(1, int8_t('c'));
+    vectors.emplace_back(2);
+
+    try
+    {
+        // Grouping vectors of different lengths is not allowed.
+        cols_type collection(vectors.begin(), vectors.end());
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+
+    vectors.clear();
+    vectors.emplace_back(0);
+    vectors.emplace_back(0);
+
+    try
+    {
+        // Grouping of empty vectors is not allowed.
+        cols_type collection(vectors.begin(), vectors.end());
+        assert(false);
+    }
+    catch (const mdds::invalid_arg_error&)
+    {
+        // Good.
+    }
+}
+
+void mtv_test_sub_element_ranges()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    std::deque<mtv_type> vectors;
+    vectors.emplace_back(0);
+    vectors.emplace_back(0);
+    vectors.emplace_back(0);
+
+    mtv_type* p = &vectors[0];
+    p->push_back<int>(0);
+    p->push_back<int>(1);
+    p->push_back<int>(2);
+
+    p = &vectors[1];
+    p->push_back<int>(3);
+    p->push_back<int>(4);
+    p->push_back<int>(5);
+
+    p = &vectors[2];
+    p->push_back<int>(6);
+    p->push_back<int>(7);
+    p->push_back<int>(8);
+
+    // +---+---+---+
+    // | 0 | 3 | 6 |
+    // | 1 | 4 | 7 |
+    // | 2 | 5 | 8 |
+    // +---+---+---+
+
+    cols_type collection(vectors.begin(), vectors.end());
+
+    // Limit the element range.
+
+    collection.set_element_range(1, 2);
+
+    cols_type::const_iterator it = collection.begin();
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 1);
+    assert(it->index == 0);
+    assert(it->position == 1);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 4);
+    assert(it->index == 1);
+    assert(it->position == 1);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 7);
+    assert(it->index == 2);
+    assert(it->position == 1);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 2);
+    assert(it->index == 0);
+    assert(it->position == 2);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 5);
+    assert(it->index == 1);
+    assert(it->position == 2);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 8);
+    assert(it->index == 2);
+    assert(it->position == 2);
+
+    assert(++it == collection.end());
+
+    // Limit the collection range.
+    collection.set_collection_range(1, 1);
+    it = collection.begin();
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 4);
+    assert(it->index == 1);
+    assert(it->position == 1);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 5);
+    assert(it->index == 1);
+    assert(it->position == 2);
+
+    assert(++it == collection.end());
+
+    // Swap and try again.
+    cols_type swapped;
+    collection.swap(swapped);
+    it = swapped.begin();
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 4);
+    assert(it->index == 1);
+    assert(it->position == 1);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->get<mdds::mtv::int32_element_block>() == 5);
+    assert(it->index == 1);
+    assert(it->position == 2);
+
+    assert(++it == swapped.end());
+}
+
+void mtv_test_sub_element_ranges_invalid()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    std::deque<mtv_type> vectors;
+    vectors.emplace_back(5);
+    vectors.emplace_back(5);
+    vectors.emplace_back(5);
+
+    cols_type collection(vectors.begin(), vectors.end());
+    try
+    {
+        // Empty size.
+        collection.set_element_range(0, 0);
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+
+    try
+    {
+        // out-of-range start position.
+        collection.set_element_range(5, 1);
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+
+    try
+    {
+        // out-of-range end position.
+        collection.set_element_range(0, 6);
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+}
+
+void mtv_test_sub_collection_ranges_invalid()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    std::deque<mtv_type> vectors;
+    vectors.emplace_back(1);
+    vectors.emplace_back(1);
+    vectors.emplace_back(1);
+    vectors.emplace_back(1);
+    vectors.emplace_back(1);
+
+    cols_type collection(vectors.begin(), vectors.end());
+    try
+    {
+        // Empty size.
+        collection.set_collection_range(0, 0);
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+
+    try
+    {
+        // out-of-range start position.
+        collection.set_collection_range(5, 1);
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+
+    try
+    {
+        // out-of-range end position.
+        collection.set_collection_range(0, 6);
+        assert(!"invalid_arg_error is expected to be thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {}
+}
+
+void mtv_test_boolean_block()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    std::vector<mtv_type> vectors;
+    vectors.reserve(2);
+    vectors.emplace_back(1, true);
+    vectors.emplace_back(1, false);
+
+    cols_type collection(vectors.begin(), vectors.end());
+
+    auto it = collection.begin();
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->index == 0);
+    assert(it->position == 0);
+    assert(it->get<mdds::mtv::boolean_element_block>() == true);
+
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->index == 1);
+    assert(it->position == 0);
+    assert(it->get<mdds::mtv::boolean_element_block>() == false);
+
+    assert(++it == collection.end());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/Makefile.am b/test/multi_type_vector/custom-trait/Makefile.am
new file mode 100644
index 0000000..e3dad36
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = aos soa
+
+EXTRA_DIST = tc/loop_unrolling.inl
diff --git a/test/multi_type_vector/custom-trait/Makefile.in b/test/multi_type_vector/custom-trait/Makefile.in
new file mode 100644
index 0000000..a755399
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/Makefile.in
@@ -0,0 +1,639 @@
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+
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+
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diff --git a/test/multi_type_vector/custom-trait/aos/test_loop_unrolling.cpp b/test/multi_type_vector/custom-trait/aos/test_loop_unrolling.cpp
new file mode 100644
index 0000000..8b26e3d
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/aos/test_loop_unrolling.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "loop_unrolling.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/aos/test_main.cpp b/test/multi_type_vector/custom-trait/aos/test_main.cpp
new file mode 100644
index 0000000..b770a0c
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/aos/test_main.cpp
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_loop_unrolling_0();
+        mtv_test_loop_unrolling_4();
+        mtv_test_loop_unrolling_8();
+        mtv_test_loop_unrolling_16();
+        mtv_test_loop_unrolling_32();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/aos/test_main.hpp b/test/multi_type_vector/custom-trait/aos/test_main.hpp
new file mode 100644
index 0000000..09d88dd
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/aos/test_main.hpp
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/aos/main.hpp>
+
+template<typename Traits>
+using mtv_alias_type = mdds::mtv::aos::multi_type_vector<Traits>;
+
+void mtv_test_loop_unrolling_0();
+void mtv_test_loop_unrolling_4();
+void mtv_test_loop_unrolling_8();
+void mtv_test_loop_unrolling_16();
+void mtv_test_loop_unrolling_32();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/soa/Makefile.am b/test/multi_type_vector/custom-trait/soa/Makefile.am
new file mode 100644
index 0000000..5ea1671
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/soa/Makefile.am
@@ -0,0 +1,18 @@
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
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+
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+
+test_SOURCES = \
+	test_main.hpp \
+	test_main.cpp \
+	test_loop_unrolling.cpp \
+	test_loop_unrolling_simd.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+TESTS = test
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/multi_type_vector/custom-trait/soa/Makefile.in b/test/multi_type_vector/custom-trait/soa/Makefile.in
new file mode 100644
index 0000000..246ad54
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/soa/Makefile.in
@@ -0,0 +1,1014 @@
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+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_loop_unrolling.Po
+	-rm -f ./$(DEPDIR)/test_loop_unrolling_simd.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/custom-trait/soa/test_loop_unrolling.cpp b/test/multi_type_vector/custom-trait/soa/test_loop_unrolling.cpp
new file mode 100644
index 0000000..8b26e3d
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/soa/test_loop_unrolling.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "loop_unrolling.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/soa/test_loop_unrolling_simd.cpp b/test/multi_type_vector/custom-trait/soa/test_loop_unrolling_simd.cpp
new file mode 100644
index 0000000..f7a1126
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/soa/test_loop_unrolling_simd.cpp
@@ -0,0 +1,201 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+namespace {
+
+using mdds::mtv::lu_factor_t;
+
+template<lu_factor_t F>
+struct trait_lu : public mdds::mtv::standard_element_blocks_traits
+{
+    using event_func = mdds::mtv::empty_event_func;
+
+    constexpr static lu_factor_t loop_unrolling = F;
+};
+
+template<lu_factor_t F>
+void run_test()
+{
+    using mtv_type = mtv_alias_type<trait_lu<F>>;
+
+    mtv_type db(5, std::string("test"));
+
+    // keep inserting blocks of alternating types at position 0 to force block
+    // position adjustments.
+
+    for (int i = 0; i < 50; ++i)
+    {
+        db.insert_empty(0, 2);
+
+        std::vector<int8_t> values(2, 89);
+        db.insert(0, values.begin(), values.end());
+    }
+}
+
+} // namespace
+
+#if SIZEOF_VOID_P == 8 && defined(__SSE2__)
+
+void mtv_test_loop_unrolling_sse2_x64()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::sse2_x64>();
+}
+
+void mtv_test_loop_unrolling_sse2_x64_4()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::sse2_x64_lu4>();
+}
+
+void mtv_test_loop_unrolling_sse2_x64_8()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::sse2_x64_lu8>();
+}
+
+void mtv_test_loop_unrolling_sse2_x64_16()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::sse2_x64_lu16>();
+}
+
+#else
+
+void print_disabled_reasons_sse2()
+{
+    cout << "Test disabled for the following reasons:" << endl;
+
+#if SIZEOF_VOID_P != 8
+    cout << "  * not a 64-bit build" << endl;
+#endif
+
+#ifndef __SSE2__
+    cout << "  * __SSE2__ not defined" << endl;
+#endif
+}
+
+void mtv_test_loop_unrolling_sse2_x64()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_sse2();
+}
+
+void mtv_test_loop_unrolling_sse2_x64_4()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_sse2();
+}
+
+void mtv_test_loop_unrolling_sse2_x64_8()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_sse2();
+}
+
+void mtv_test_loop_unrolling_sse2_x64_16()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_sse2();
+}
+
+#endif
+
+#if SIZEOF_VOID_P == 8 && defined(__AVX2__)
+
+void mtv_test_loop_unrolling_avx2_x64()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::avx2_x64>();
+}
+
+void mtv_test_loop_unrolling_avx2_x64_4()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::avx2_x64_lu4>();
+}
+
+void mtv_test_loop_unrolling_avx2_x64_8()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    run_test<lu_factor_t::avx2_x64_lu8>();
+}
+
+#else
+
+void print_disabled_reasons_avx2()
+{
+    cout << "Test disabled for the following reasons:" << endl;
+
+#if SIZEOF_VOID_P != 8
+    cout << "  * not a 64-bit build" << endl;
+#endif
+
+#ifndef __AVX2__
+    cout << "  * __AVX2__ not defined" << endl;
+#endif
+}
+
+void mtv_test_loop_unrolling_avx2_x64()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_avx2();
+}
+
+void mtv_test_loop_unrolling_avx2_x64_4()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_avx2();
+}
+
+void mtv_test_loop_unrolling_avx2_x64_8()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    print_disabled_reasons_avx2();
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/soa/test_main.cpp b/test/multi_type_vector/custom-trait/soa/test_main.cpp
new file mode 100644
index 0000000..b99bc98
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/soa/test_main.cpp
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_loop_unrolling_0();
+        mtv_test_loop_unrolling_4();
+        mtv_test_loop_unrolling_8();
+        mtv_test_loop_unrolling_16();
+        mtv_test_loop_unrolling_32();
+        mtv_test_loop_unrolling_sse2_x64();
+        mtv_test_loop_unrolling_sse2_x64_4();
+        mtv_test_loop_unrolling_sse2_x64_8();
+        mtv_test_loop_unrolling_sse2_x64_16();
+        mtv_test_loop_unrolling_avx2_x64();
+        mtv_test_loop_unrolling_avx2_x64_4();
+        mtv_test_loop_unrolling_avx2_x64_8();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/soa/test_main.hpp b/test/multi_type_vector/custom-trait/soa/test_main.hpp
new file mode 100644
index 0000000..9007727
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/soa/test_main.hpp
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/soa/main.hpp>
+
+template<typename Traits>
+using mtv_alias_type = mdds::mtv::soa::multi_type_vector<Traits>;
+
+void mtv_test_loop_unrolling_0();
+void mtv_test_loop_unrolling_4();
+void mtv_test_loop_unrolling_8();
+void mtv_test_loop_unrolling_16();
+void mtv_test_loop_unrolling_32();
+
+void mtv_test_loop_unrolling_sse2_x64(); // SoA only
+void mtv_test_loop_unrolling_sse2_x64_4(); // SoA only
+void mtv_test_loop_unrolling_sse2_x64_8(); // SoA only
+void mtv_test_loop_unrolling_sse2_x64_16(); // SoA only
+
+void mtv_test_loop_unrolling_avx2_x64(); // SoA only
+void mtv_test_loop_unrolling_avx2_x64_4(); // SoA only
+void mtv_test_loop_unrolling_avx2_x64_8(); // SoA only
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom-trait/tc/loop_unrolling.inl b/test/multi_type_vector/custom-trait/tc/loop_unrolling.inl
new file mode 100644
index 0000000..e28420a
--- /dev/null
+++ b/test/multi_type_vector/custom-trait/tc/loop_unrolling.inl
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+namespace {
+
+using mdds::mtv::lu_factor_t;
+
+template<lu_factor_t F>
+struct trait_lu : public mdds::mtv::standard_element_blocks_traits
+{
+    using event_func = mdds::mtv::empty_event_func;
+
+    constexpr static lu_factor_t loop_unrolling = F;
+};
+
+} // namespace
+
+template<lu_factor_t F>
+void mtv_test_loop_unrolling()
+{
+    cout << "loop unrolling factor = " << int(F) << endl;
+    using mtv_type = mtv_alias_type<trait_lu<F>>;
+
+    mtv_type db(5, std::string("test"));
+
+    // keep inserting blocks of alternating types at position 0 to force block
+    // position adjustments.
+
+    for (int i = 0; i < 50; ++i)
+    {
+        db.insert_empty(0, 2);
+
+        std::vector<int8_t> values(2, 89);
+        db.insert(0, values.begin(), values.end());
+    }
+}
+
+void mtv_test_loop_unrolling_0()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_test_loop_unrolling<lu_factor_t::none>();
+}
+
+void mtv_test_loop_unrolling_4()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_test_loop_unrolling<lu_factor_t::lu4>();
+}
+
+void mtv_test_loop_unrolling_8()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_test_loop_unrolling<lu_factor_t::lu8>();
+}
+
+void mtv_test_loop_unrolling_16()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_test_loop_unrolling<lu_factor_t::lu16>();
+}
+
+void mtv_test_loop_unrolling_32()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_test_loop_unrolling<lu_factor_t::lu32>();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/Makefile.am b/test/multi_type_vector/custom/Makefile.am
new file mode 100644
index 0000000..729383f
--- /dev/null
+++ b/test/multi_type_vector/custom/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = aos soa tc
+
+EXTRA_DIST = common_types.hpp
diff --git a/test/multi_type_vector/custom/Makefile.in b/test/multi_type_vector/custom/Makefile.in
new file mode 100644
index 0000000..e48ac6b
--- /dev/null
+++ b/test/multi_type_vector/custom/Makefile.in
@@ -0,0 +1,639 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
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+      ?) ;; \
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+         exit 1;; \
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+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
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+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
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+am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_compile_stdcxx.m4 \
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+	$(top_srcdir)/m4/m4_ax_valgrind_check.m4 \
+	$(top_srcdir)/configure.ac
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new file mode 100644
index 0000000..07546cc
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/Makefile.in
@@ -0,0 +1,1128 @@
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+	}; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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diff --git a/test/multi_type_vector/custom/aos/test_basic.cpp b/test/multi_type_vector/custom/aos/test_basic.cpp
new file mode 100644
index 0000000..8857d98
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_basic.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "basic.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/aos/test_main.cpp b/test/multi_type_vector/custom/aos/test_main.cpp
new file mode 100644
index 0000000..897c864
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_main.cpp
@@ -0,0 +1,64 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2012-2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include <memory>
+#include <sstream>
+#include <vector>
+
+using namespace std;
+
+int main()
+{
+    try
+    {
+        mtv_test_misc_types();
+        mtv_test_misc_block_identifier();
+        mtv_test_misc_custom_block_func1();
+        mtv_test_misc_custom_block_func3();
+        mtv_test_misc_release();
+        mtv_test_misc_construction_with_array();
+        mtv_test_basic();
+        mtv_test_basic_equality();
+        mtv_test_managed_block();
+        mtv_test_transfer();
+        mtv_test_swap();
+        mtv_test_swap_2();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/aos/test_main.hpp b/test/multi_type_vector/custom/aos/test_main.hpp
new file mode 100644
index 0000000..960a39c
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_main.hpp
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include "common_types.hpp"
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/aos/main.hpp>
+
+using mtv_type = mdds::mtv::aos::multi_type_vector<user_muser_trait>;
+using mtv_fruit_type = mdds::mtv::aos::multi_type_vector<fruit_trait>;
+using mtv3_type = mdds::mtv::aos::multi_type_vector<muser_fruit_date_trait>;
+
+void mtv_test_misc_types();
+void mtv_test_misc_block_identifier();
+void mtv_test_misc_custom_block_func1();
+void mtv_test_misc_custom_block_func3();
+void mtv_test_misc_release();
+void mtv_test_misc_construction_with_array();
+void mtv_test_basic();
+void mtv_test_basic_equality();
+void mtv_test_managed_block();
+void mtv_test_transfer();
+void mtv_test_swap();
+void mtv_test_swap_2();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/aos/test_managed_block.cpp b/test/multi_type_vector/custom/aos/test_managed_block.cpp
new file mode 100644
index 0000000..f734fef
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_managed_block.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "managed_block.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/aos/test_misc.cpp b/test/multi_type_vector/custom/aos/test_misc.cpp
new file mode 100644
index 0000000..b8589e2
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_misc.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "misc.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/aos/test_swap.cpp b/test/multi_type_vector/custom/aos/test_swap.cpp
new file mode 100644
index 0000000..21b7d24
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_swap.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "swap.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/aos/test_transfer.cpp b/test/multi_type_vector/custom/aos/test_transfer.cpp
new file mode 100644
index 0000000..cc53440
--- /dev/null
+++ b/test/multi_type_vector/custom/aos/test_transfer.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "transfer.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/common_types.hpp b/test/multi_type_vector/custom/common_types.hpp
new file mode 100644
index 0000000..6b786d1
--- /dev/null
+++ b/test/multi_type_vector/custom/common_types.hpp
@@ -0,0 +1,162 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include <mdds/multi_type_vector/macro.hpp>
+#include <mdds/multi_type_vector/standard_element_blocks.hpp>
+
+/** Caller manages the life cycle of these cells. */
+struct user_cell
+{
+    double value;
+
+    user_cell() : value(0.0)
+    {}
+    user_cell(double _v) : value(_v)
+    {}
+};
+
+/**
+ * Managed user cell: the storing block manages the life cycle of these
+ * cells.
+ */
+struct muser_cell
+{
+    double value;
+
+    muser_cell() : value(0.0)
+    {}
+    muser_cell(const muser_cell& r) : value(r.value)
+    {}
+    muser_cell(double _v) : value(_v)
+    {}
+    ~muser_cell()
+    {}
+};
+
+enum my_fruit_type
+{
+    unknown_fruit = 0,
+    apple,
+    orange,
+    mango,
+    peach
+};
+
+struct date
+{
+    int year;
+    int month;
+    int day;
+
+    date() : year(0), month(0), day(0)
+    {}
+    date(int _year, int _month, int _day) : year(_year), month(_month), day(_day)
+    {}
+};
+
+/** custom cell type definition. */
+constexpr mdds::mtv::element_t element_type_user_block = mdds::mtv::element_type_user_start;
+constexpr mdds::mtv::element_t element_type_muser_block = mdds::mtv::element_type_user_start + 1;
+constexpr mdds::mtv::element_t element_type_fruit_block = mdds::mtv::element_type_user_start + 2;
+constexpr mdds::mtv::element_t element_type_date_block = mdds::mtv::element_type_user_start + 3;
+
+using user_cell_block = mdds::mtv::default_element_block<element_type_user_block, user_cell*>;
+using muser_cell_block = mdds::mtv::managed_element_block<element_type_muser_block, muser_cell>;
+using fruit_block = mdds::mtv::default_element_block<element_type_fruit_block, my_fruit_type>;
+using date_block = mdds::mtv::default_element_block<element_type_date_block, date>;
+
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS_PTR(user_cell, element_type_user_block, nullptr, user_cell_block)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS_PTR(muser_cell, element_type_muser_block, nullptr, muser_cell_block)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(my_fruit_type, element_type_fruit_block, unknown_fruit, fruit_block)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(date, element_type_date_block, date(), date_block)
+
+template<typename T>
+class cell_pool
+{
+    std::vector<std::unique_ptr<T>> m_pool;
+
+public:
+    cell_pool() = default;
+    cell_pool(const cell_pool&) = delete;
+    cell_pool& operator=(const cell_pool&) = delete;
+
+    T* construct()
+    {
+        m_pool.emplace_back(new T);
+        return m_pool.back().get();
+    }
+
+    void clear()
+    {
+        m_pool.clear();
+    }
+};
+
+class user_cell_pool : public cell_pool<user_cell>
+{
+public:
+    user_cell* construct(double val)
+    {
+        user_cell* p = cell_pool<user_cell>::construct();
+        p->value = val;
+        return p;
+    }
+};
+
+struct user_muser_trait : public mdds::mtv::default_traits
+{
+    using block_funcs = mdds::mtv::element_block_funcs<
+        mdds::mtv::boolean_element_block, mdds::mtv::int8_element_block, mdds::mtv::uint8_element_block,
+        mdds::mtv::int16_element_block, mdds::mtv::uint16_element_block, mdds::mtv::int32_element_block,
+        mdds::mtv::uint32_element_block, mdds::mtv::int64_element_block, mdds::mtv::uint64_element_block,
+        mdds::mtv::float_element_block, mdds::mtv::double_element_block, mdds::mtv::string_element_block,
+        user_cell_block, muser_cell_block>;
+};
+
+struct fruit_trait : public mdds::mtv::default_traits
+{
+    using block_funcs = mdds::mtv::element_block_funcs<
+        mdds::mtv::boolean_element_block, mdds::mtv::int8_element_block, mdds::mtv::uint8_element_block,
+        mdds::mtv::int16_element_block, mdds::mtv::uint16_element_block, mdds::mtv::int32_element_block,
+        mdds::mtv::uint32_element_block, mdds::mtv::int64_element_block, mdds::mtv::uint64_element_block,
+        mdds::mtv::float_element_block, mdds::mtv::double_element_block, mdds::mtv::string_element_block, fruit_block>;
+};
+
+struct muser_fruit_date_trait : public mdds::mtv::default_traits
+{
+    using block_funcs = mdds::mtv::element_block_funcs<
+        mdds::mtv::boolean_element_block, mdds::mtv::int8_element_block, mdds::mtv::uint8_element_block,
+        mdds::mtv::int16_element_block, mdds::mtv::uint16_element_block, mdds::mtv::int32_element_block,
+        mdds::mtv::uint32_element_block, mdds::mtv::int64_element_block, mdds::mtv::uint64_element_block,
+        mdds::mtv::float_element_block, mdds::mtv::double_element_block, mdds::mtv::string_element_block,
+        muser_cell_block, fruit_block, date_block>;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/Makefile.am b/test/multi_type_vector/custom/soa/Makefile.am
new file mode 100644
index 0000000..e1b65e0
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/Makefile.am
@@ -0,0 +1,26 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = test-main
+
+test_main_SOURCES = \
+	test_main.cpp \
+	test_basic.cpp \
+	test_managed_block.cpp \
+	test_misc.cpp \
+	test_swap.cpp \
+	test_transfer.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_main_CPPFLAGS = \
+	-I$(srcdir)/.. \
+	-I$(srcdir)/../tc \
+	$(AM_CPPFLAGS)
+
+EXTRA_DIST = test_main.hpp
+
+TESTS = test-main
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/multi_type_vector/custom/soa/Makefile.in b/test/multi_type_vector/custom/soa/Makefile.in
new file mode 100644
index 0000000..b38a4bb
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/Makefile.in
@@ -0,0 +1,1128 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+VPATH = @srcdir@
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+  strip_trailopt () \
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+  for flg in $$sane_makeflags; do \
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+        -*I) strip_trailopt 'I'; skip_next=yes;; \
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+      *$$target_option*) has_opt=yes; break;; \
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+	$(am__cd) $(top_srcdir) && \
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+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
+	create_testsuite_report --maybe-color;				\
+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
+check-TESTS: $(check_PROGRAMS)
+	@list='$(RECHECK_LOGS)';           test -z "$$list" || rm -f $$list
+	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	trs_list=`for i in $$bases; do echo $$i.trs; done`; \
+	log_list=`echo $$log_list`; trs_list=`echo $$trs_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) TEST_LOGS="$$log_list"; \
+	exit $$?;
+recheck: all $(check_PROGRAMS)
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	bases=`for i in $$bases; do echo $$i; done \
+	         | $(am__list_recheck_tests)` || exit 1; \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	log_list=`echo $$log_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
+test-main.log: test-main$(EXEEXT)
+	@p='test-main$(EXEEXT)'; \
+	b='test-main'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+.test.log:
+	@p='$<'; \
+	$(am__set_b); \
+	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_TEST_LOG_DRIVER_FLAGS) $(TEST_LOG_DRIVER_FLAGS) -- $(TEST_LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+@am__EXEEXT_TRUE@.test$(EXEEXT).log:
+@am__EXEEXT_TRUE@	@p='$<'; \
+@am__EXEEXT_TRUE@	$(am__set_b); \
+@am__EXEEXT_TRUE@	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
+@am__EXEEXT_TRUE@	--log-file $$b.log --trs-file $$b.trs \
+@am__EXEEXT_TRUE@	$(am__common_driver_flags) $(AM_TEST_LOG_DRIVER_FLAGS) $(TEST_LOG_DRIVER_FLAGS) -- $(TEST_LOG_COMPILE) \
+@am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+	-test -z "$(top_builddir)/test/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(am__dirstamp)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+check-valgrind: check-valgrind-am
+
+check-valgrind-am: check-valgrind-local
+
+check-valgrind-drd: check-valgrind-drd-am
+
+check-valgrind-drd-am: check-valgrind-drd-local
+
+check-valgrind-helgrind: check-valgrind-helgrind-am
+
+check-valgrind-helgrind-am: check-valgrind-helgrind-local
+
+check-valgrind-memcheck: check-valgrind-memcheck-am
+
+check-valgrind-memcheck-am: check-valgrind-memcheck-local
+
+check-valgrind-sgcheck: check-valgrind-sgcheck-am
+
+check-valgrind-sgcheck-am: check-valgrind-sgcheck-local
+
+clean: clean-am
+
+clean-am: clean-checkPROGRAMS clean-generic mostlyclean-am
+
+distclean: distclean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_main-test_global.Po
+	-rm -f ./$(DEPDIR)/test_main-test_basic.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_managed_block.Po
+	-rm -f ./$(DEPDIR)/test_main-test_misc.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap.Po
+	-rm -f ./$(DEPDIR)/test_main-test_transfer.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
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+
+install-ps: install-ps-am
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_main-test_global.Po
+	-rm -f ./$(DEPDIR)/test_main-test_basic.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_managed_block.Po
+	-rm -f ./$(DEPDIR)/test_main-test_misc.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap.Po
+	-rm -f ./$(DEPDIR)/test_main-test_transfer.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+mostlyclean: mostlyclean-am
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+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
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+pdf-am:
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+ps: ps-am
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+ps-am:
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+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/custom/soa/test_basic.cpp b/test/multi_type_vector/custom/soa/test_basic.cpp
new file mode 100644
index 0000000..8857d98
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_basic.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "basic.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/test_main.cpp b/test/multi_type_vector/custom/soa/test_main.cpp
new file mode 100644
index 0000000..4c92050
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_main.cpp
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_misc_types();
+        mtv_test_misc_block_identifier();
+        mtv_test_misc_custom_block_func1();
+        mtv_test_misc_custom_block_func3();
+        mtv_test_misc_release();
+        mtv_test_misc_construction_with_array();
+        mtv_test_basic();
+        mtv_test_basic_equality();
+        mtv_test_managed_block();
+        mtv_test_transfer();
+        mtv_test_swap();
+        mtv_test_swap_2();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/test_main.hpp b/test/multi_type_vector/custom/soa/test_main.hpp
new file mode 100644
index 0000000..2005f2f
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_main.hpp
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include "common_types.hpp"
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/soa/main.hpp>
+
+template<typename T>
+using mtv_template_type = mdds::mtv::soa::multi_type_vector<T>;
+
+using mtv_type = mtv_template_type<user_muser_trait>;
+using mtv_fruit_type = mtv_template_type<fruit_trait>;
+using mtv3_type = mtv_template_type<muser_fruit_date_trait>;
+
+void mtv_test_misc_types();
+void mtv_test_misc_block_identifier();
+void mtv_test_misc_custom_block_func1();
+void mtv_test_misc_custom_block_func3();
+void mtv_test_misc_release();
+void mtv_test_misc_construction_with_array();
+void mtv_test_basic();
+void mtv_test_basic_equality();
+void mtv_test_managed_block();
+void mtv_test_transfer();
+void mtv_test_swap();
+void mtv_test_swap_2();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/test_managed_block.cpp b/test/multi_type_vector/custom/soa/test_managed_block.cpp
new file mode 100644
index 0000000..f734fef
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_managed_block.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "managed_block.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/test_misc.cpp b/test/multi_type_vector/custom/soa/test_misc.cpp
new file mode 100644
index 0000000..b8589e2
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_misc.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "misc.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/test_swap.cpp b/test/multi_type_vector/custom/soa/test_swap.cpp
new file mode 100644
index 0000000..21b7d24
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_swap.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "swap.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/soa/test_transfer.cpp b/test/multi_type_vector/custom/soa/test_transfer.cpp
new file mode 100644
index 0000000..cc53440
--- /dev/null
+++ b/test/multi_type_vector/custom/soa/test_transfer.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "transfer.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/tc/Makefile.am b/test/multi_type_vector/custom/tc/Makefile.am
new file mode 100644
index 0000000..c33c6ac
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/Makefile.am
@@ -0,0 +1,8 @@
+
+EXTRA_DIST = \
+	basic.inl \
+	managed_block.inl \
+	misc.inl \
+	swap.inl \
+	transfer.inl
+
diff --git a/test/multi_type_vector/custom/tc/Makefile.in b/test/multi_type_vector/custom/tc/Makefile.in
new file mode 100644
index 0000000..81a86cf
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/Makefile.in
@@ -0,0 +1,466 @@
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+
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+	  case '$(am__configure_deps)' in \
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+	      exit 1;; \
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/multi_type_vector/custom/tc/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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+	esac; \
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+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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diff --git a/test/multi_type_vector/custom/tc/basic.inl b/test/multi_type_vector/custom/tc/basic.inl
new file mode 100644
index 0000000..1602683
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/basic.inl
@@ -0,0 +1,216 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_basic()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // mdds::multi_type_vector does not manage the life cycle of individual cells;
+    // the client code needs to manage them when storing pointers.
+
+    user_cell_pool pool;
+
+    {
+        // set_cell()
+        mtv_type db(4);
+        user_cell* p = pool.construct(1.2);
+        db.set(0, p);
+        db.set(1, p);
+        db.set(3, p);
+        db.set(2, p);
+
+        user_cell* p2 = db.get<user_cell*>(0);
+        assert(p->value == p2->value);
+
+        p = pool.construct(3.4);
+        db.set(0, p);
+        p2 = db.get<user_cell*>(0);
+        assert(p->value == p2->value);
+        pool.clear();
+    }
+
+    {
+        // set_cells(), resize(), insert_cells().
+        mtv_type db(3);
+        user_cell* p1 = pool.construct(1.1);
+        user_cell* p2 = pool.construct(2.2);
+        user_cell* p3 = pool.construct(3.3);
+        std::vector<user_cell*> vals;
+        vals.reserve(3);
+        vals.push_back(p1);
+        vals.push_back(p2);
+        vals.push_back(p3);
+        db.set(0, vals.begin(), vals.end());
+
+        user_cell* ptest;
+        ptest = db.get<user_cell*>(0);
+        assert(ptest && ptest->value == 1.1);
+        ptest = db.get<user_cell*>(1);
+        assert(ptest && ptest->value == 2.2);
+        ptest = db.get<user_cell*>(2);
+        assert(ptest && ptest->value == 3.3);
+
+        db.resize(6);
+        user_cell* p4 = pool.construct(11);
+        user_cell* p5 = pool.construct(22);
+        user_cell* p6 = pool.construct(33);
+        vals.clear();
+        vals.push_back(p4);
+        vals.push_back(p5);
+        vals.push_back(p6);
+        db.set(3, vals.begin(), vals.end());
+
+        ptest = db.get<user_cell*>(0);
+        assert(ptest && ptest->value == 1.1);
+        ptest = db.get<user_cell*>(1);
+        assert(ptest && ptest->value == 2.2);
+        ptest = db.get<user_cell*>(2);
+        assert(ptest && ptest->value == 3.3);
+        ptest = db.get<user_cell*>(3);
+        assert(ptest && ptest->value == 11);
+        ptest = db.get<user_cell*>(4);
+        assert(ptest && ptest->value == 22);
+        ptest = db.get<user_cell*>(5);
+        assert(ptest && ptest->value == 33);
+
+        // Shrink the block to erase the bottom 3 cells.
+        db.resize(3);
+        assert(db.size() == 3);
+        ptest = db.get<user_cell*>(2);
+        assert(ptest && ptest->value == 3.3);
+
+        // Re-insert the values at the front.
+        db.insert(0, vals.begin(), vals.end());
+        assert(db.size() == 6);
+
+        ptest = db.get<user_cell*>(0);
+        assert(ptest && ptest->value == 11);
+        ptest = db.get<user_cell*>(1);
+        assert(ptest && ptest->value == 22);
+        ptest = db.get<user_cell*>(2);
+        assert(ptest && ptest->value == 33);
+        ptest = db.get<user_cell*>(3);
+        assert(ptest && ptest->value == 1.1);
+        ptest = db.get<user_cell*>(4);
+        assert(ptest && ptest->value == 2.2);
+        ptest = db.get<user_cell*>(5);
+        assert(ptest && ptest->value == 3.3);
+
+        // set_empty(), is_empty().
+        db.set_empty(2, 4);
+        assert(db.block_size() == 3);
+        assert(db.get<user_cell*>(1)->value == 22);
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.get<user_cell*>(5)->value == 3.3);
+
+        // erase()
+        db.erase(3, 5);
+        assert(db.size() == 3);
+        assert(db.get<user_cell*>(1)->value == 22);
+        assert(db.is_empty(2));
+
+        // insert_empty().
+        db.insert_empty(1, 2);
+        assert(db.size() == 5);
+        assert(db.get<user_cell*>(0)->value == 11);
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.get<user_cell*>(3)->value == 22);
+        assert(db.is_empty(4));
+
+        pool.clear();
+    }
+
+    {
+        // set_cells() to overwrite existing values of type user_cell*.
+        mtv_type db(2);
+        user_cell* p0 = pool.construct(1.2);
+        db.set(1, p0);
+        db.set(0, p0);
+
+        std::vector<user_cell*> vals;
+        vals.push_back(pool.construct(2.3));
+        vals.push_back(pool.construct(2.4));
+        db.set(0, vals.begin(), vals.end());
+        pool.clear();
+    }
+
+    {
+        mtv_type db(4);
+        user_cell* p0 = pool.construct(1.1);
+        db.set(3, p0);
+
+        std::vector<user_cell*> vals;
+        vals.push_back(pool.construct(2.3));
+        vals.push_back(pool.construct(2.4));
+        db.set(1, vals.begin(), vals.end());
+        assert(db.is_empty(0));
+        assert(db.get<user_cell*>(1)->value == 2.3);
+        assert(db.get<user_cell*>(2)->value == 2.4);
+        assert(db.get<user_cell*>(3)->value == 1.1);
+
+        pool.clear();
+    }
+
+    {
+        // Get empty value.
+        mtv_type db(1);
+        user_cell* p = db.get<user_cell*>(0);
+        assert(p == nullptr);
+    }
+}
+
+void mtv_test_basic_equality()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    user_cell_pool pool;
+
+    mtv_type db1(3);
+    mtv_type db2 = db1;
+    assert(db2 == db1);
+    user_cell* p0 = pool.construct(1.1);
+    db1.set(0, p0);
+    assert(db1 != db2);
+    db2.set(0, p0);
+    assert(db1 == db2);
+    db1.set(2, std::string("foo"));
+    db2.set(2, std::string("foo"));
+    assert(db1 == db2);
+
+    // same value but different memory addresses.
+    user_cell* p1 = pool.construct(1.2);
+    user_cell* p2 = pool.construct(1.2);
+    db1.set(1, p1);
+    db2.set(1, p2);
+    assert(db1 != db2); // equality is by the pointer value.
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/tc/managed_block.inl b/test/multi_type_vector/custom/tc/managed_block.inl
new file mode 100644
index 0000000..c6cf4a7
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/managed_block.inl
@@ -0,0 +1,655 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+/**
+ * This test is to be run with valgrind, to ensure no memory leak occurs.
+ */
+void mtv_test_managed_block()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        mtv_type db(1);
+        db.set(0, new muser_cell(1.0));
+        const muser_cell* p = db.get<muser_cell*>(0);
+        assert(p->value == 1.0);
+        db.set(0, new muser_cell(2.0)); // overwrite.
+        p = db.get<muser_cell*>(0);
+        assert(p->value == 2.0);
+    }
+
+    {
+        // Overwrite with empty cells.
+        mtv_type db(3);
+
+        // Empty the upper part.
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.set_empty(0, 0);
+
+        // Empty the lower part.
+        db.set(0, new muser_cell(4.0));
+        db.set_empty(2, 2);
+
+        // Empty the middle part.
+        db.set(2, new muser_cell(5.0));
+        db.set_empty(1, 1);
+    }
+
+    {
+        // More overwrite with empty cells.
+        mtv_type db(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, 3.0);
+        db.set_empty(1, 2);
+
+        db.set(0, std::string("foo"));
+        db.set(1, new muser_cell(4.0));
+        db.set(2, new muser_cell(5.0));
+        db.set_empty(0, 1);
+
+        db.set(0, new muser_cell(6.0));
+        db.set(1, static_cast<uint64_t>(12));
+        db.set_empty(0, 2);
+    }
+
+    {
+        // Another case for set_empty().
+        mtv_type db(5);
+        db.set(0, 1.2);
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.set(3, new muser_cell(4.0));
+        db.set(4, new muser_cell(5.0));
+        db.set_empty(2, 4);
+
+        db.set(2, new muser_cell(3.0));
+        db.set(3, new muser_cell(4.0));
+        db.set(4, new muser_cell(5.0));
+        db.set_empty(1, 2);
+
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.set_empty(2, 3);
+    }
+
+    {
+        // Test for cloning.
+        mtv_type db(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+
+        // swap
+        mtv_type db2;
+        db2.swap(db);
+        assert(db.empty());
+        assert(db2.get<muser_cell*>(0)->value == 1.0);
+        assert(db2.get<muser_cell*>(1)->value == 2.0);
+        assert(db2.get<muser_cell*>(2)->value == 3.0);
+        db.swap(db2);
+        assert(db2.empty());
+        assert(db.get<muser_cell*>(0)->value == 1.0);
+        assert(db.get<muser_cell*>(1)->value == 2.0);
+        assert(db.get<muser_cell*>(2)->value == 3.0);
+
+        // copy constructor
+        mtv_type db_copied(db);
+        assert(db_copied.size() == 3);
+        assert(db_copied.get<muser_cell*>(0)->value == 1.0);
+        assert(db_copied.get<muser_cell*>(1)->value == 2.0);
+        assert(db_copied.get<muser_cell*>(2)->value == 3.0);
+
+        // Assignment.
+        mtv_type db_assigned = db;
+        assert(db_assigned.size() == 3);
+        assert(db_assigned.get<muser_cell*>(0)->value == 1.0);
+        assert(db_assigned.get<muser_cell*>(1)->value == 2.0);
+        assert(db_assigned.get<muser_cell*>(2)->value == 3.0);
+    }
+
+    {
+        // Resize and clear
+        mtv_type db(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.resize(1);
+        assert(db.get<muser_cell*>(0)->value == 1.0);
+
+        db.clear();
+    }
+
+    {
+        // Overwrite with a cell of different type.
+        mtv_type db(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.set(1, 4.5);
+    }
+
+    {
+        // Erase (single block)
+        mtv_type db(3);
+
+        // Erase the whole thing.
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.erase(0, 2);
+        assert(db.empty());
+
+        // Erase top.
+        db.resize(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.erase(0, 1);
+        assert(db.size() == 1);
+
+        // Erase bottom.
+        db.resize(3);
+        db.set(1, new muser_cell(4.0));
+        db.set(2, new muser_cell(5.0));
+        db.erase(1, 2);
+        assert(db.size() == 1);
+
+        // Erase middle.
+        db.resize(3);
+        db.set(1, new muser_cell(4.0));
+        db.set(2, new muser_cell(5.0));
+        db.erase(1, 1);
+        assert(db.size() == 2);
+    }
+
+    {
+        // Erase (single block with preceding block)
+        mtv_type db(4);
+
+        // Erase the whole thing.
+        db.set(0, 1.1);
+        db.set(1, new muser_cell(1.0));
+        db.set(2, new muser_cell(2.0));
+        db.set(3, new muser_cell(3.0));
+        db.erase(1, 3);
+        assert(db.size() == 1);
+
+        // Erase top.
+        db.resize(4);
+        db.set(1, new muser_cell(1.0));
+        db.set(2, new muser_cell(2.0));
+        db.set(3, new muser_cell(3.0));
+        db.erase(1, 2);
+        assert(db.size() == 2);
+
+        // Erase bottom.
+        db.resize(4);
+        db.set(2, new muser_cell(4.0));
+        db.set(3, new muser_cell(5.0));
+        db.erase(2, 3);
+        assert(db.size() == 2);
+
+        // Erase middle.
+        db.resize(4);
+        db.set(2, new muser_cell(4.0));
+        db.set(3, new muser_cell(5.0));
+        db.erase(2, 2);
+        assert(db.size() == 3);
+    }
+
+    {
+        // Erase (multi-block 1)
+        mtv_type db(6);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.set(3, 4.1);
+        db.set(4, 4.2);
+        db.set(5, 4.3);
+        db.erase(1, 4);
+    }
+
+    {
+        // Erase (multi-block 2)
+        mtv_type db(6);
+        db.set(0, 4.1);
+        db.set(1, 4.2);
+        db.set(2, 4.3);
+        db.set(3, new muser_cell(5.0));
+        db.set(4, new muser_cell(6.0));
+        db.set(5, new muser_cell(7.0));
+        db.erase(1, 4);
+    }
+
+    {
+        // Erase (multi-block 3)
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        db.set(2, new muser_cell(3.0));
+        db.set(3, new muser_cell(4.0));
+        db.set(4, 5.0);
+        db.set(5, 6.0);
+        db.erase(1, 4);
+    }
+
+    {
+        // Insert into the middle of block.  This one shouldn't overwrite any
+        // cells, but just to be safe...
+        mtv_type db(2);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.insert_empty(1, 2);
+        assert(db.size() == 4);
+        assert(db.get<muser_cell*>(0)->value == 1.0);
+        assert(db.get<muser_cell*>(3)->value == 2.0);
+    }
+
+    {
+        // set_cells (simple overwrite)
+        mtv_type db(2);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+
+        std::vector<muser_cell*> vals;
+        vals.push_back(new muser_cell(3.0));
+        vals.push_back(new muser_cell(4.0));
+        db.set(0, vals.begin(), vals.end());
+        assert(db.get<muser_cell*>(0)->value == 3.0);
+        assert(db.get<muser_cell*>(1)->value == 4.0);
+    }
+
+    {
+        // set_cells (overwrite upper)
+        mtv_type db(2);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        double vals[] = {3.0};
+        const double* p = &vals[0];
+        db.set(0, p, p + 1);
+        assert(db.get<double>(0) == 3.0);
+        assert(db.get<muser_cell*>(1)->value == 2.0);
+    }
+
+    {
+        // set_cells (overwrite lower)
+        mtv_type db(2);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        double vals[] = {3.0};
+        const double* p = &vals[0];
+        db.set(1, p, p + 1);
+        assert(db.get<muser_cell*>(0)->value == 1.0);
+        assert(db.get<double>(1) == 3.0);
+    }
+
+    {
+        // set_cells (overwrite middle)
+        mtv_type db(4);
+        db.set(0, 1.1);
+        db.set(1, new muser_cell(1.0));
+        db.set(2, new muser_cell(2.0));
+        db.set(3, new muser_cell(3.0));
+        double vals[] = {4.0};
+        const double* p = &vals[0];
+        db.set(2, p, p + 1);
+        assert(db.get<muser_cell*>(1)->value == 1.0);
+        assert(db.get<double>(2) == 4.0);
+        assert(db.get<muser_cell*>(3)->value == 3.0);
+    }
+    {
+        // insert_empty() to split the block into two.
+        mtv_type db(3);
+        db.set(0, 1.1);
+        db.set(1, new muser_cell(1.0));
+        db.set(2, new muser_cell(2.0));
+        db.insert_empty(2, 2);
+        assert(db.size() == 5);
+        assert(db.get<muser_cell*>(1)->value == 1.0);
+        assert(db.get<muser_cell*>(4)->value == 2.0);
+    }
+
+    {
+        // erase() to merge two blocks.
+        mtv_type db(4);
+        db.set(0, 1.1);
+        db.set(1, new muser_cell(1.0));
+        db.set(2, static_cast<uint64_t>(2));
+        db.set(3, new muser_cell(3.0));
+        assert(db.block_size() == 4);
+        assert(db.size() == 4);
+
+        db.erase(2, 2);
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<muser_cell*>(1)->value == 1.0);
+        assert(db.get<muser_cell*>(2)->value == 3.0);
+    }
+
+    {
+        // set_cells() across multiple blocks.
+        mtv_type db(5);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, 1.2);
+        db.set(3, new muser_cell(3.0));
+        db.set(4, new muser_cell(4.0));
+        uint64_t vals[] = {5, 6, 7};
+        const uint64_t* p = &vals[0];
+        db.set(1, p, p + 3);
+    }
+
+    {
+        // set_cells() across multiple blocks, part 2.
+        mtv_type db(6);
+        db.set(0, static_cast<uint64_t>(12));
+        db.set(1, new muser_cell(1.0));
+        db.set(2, new muser_cell(2.0));
+        db.set(3, 1.2);
+        db.set(4, new muser_cell(3.0));
+        db.set(5, new muser_cell(4.0));
+        assert(db.block_size() == 4);
+
+        std::vector<muser_cell*> vals;
+        vals.push_back(new muser_cell(5.0));
+        vals.push_back(new muser_cell(6.0));
+        vals.push_back(new muser_cell(7.0));
+        db.set(2, vals.begin(), vals.end());
+        assert(db.block_size() == 2);
+    }
+
+    {
+        // set_cell() to merge 3 blocks.
+        mtv_type db(6);
+        db.set(0, static_cast<uint64_t>(12));
+        db.set(1, new muser_cell(1.0));
+        db.set(2, new muser_cell(2.0));
+        db.set(3, 1.2);
+        db.set(4, new muser_cell(3.0));
+        db.set(5, new muser_cell(4.0));
+        assert(db.block_size() == 4);
+        assert(db.get<uint64_t>(0) == 12);
+        assert(db.get<muser_cell*>(1)->value == 1.0);
+        assert(db.get<muser_cell*>(2)->value == 2.0);
+        assert(db.get<double>(3) == 1.2);
+        assert(db.get<muser_cell*>(4)->value == 3.0);
+        assert(db.get<muser_cell*>(5)->value == 4.0);
+
+        db.set(3, new muser_cell(5.0)); // merge blocks.
+        assert(db.block_size() == 2);
+        assert(db.get<uint64_t>(0) == 12);
+        assert(db.get<muser_cell*>(1)->value == 1.0);
+        assert(db.get<muser_cell*>(2)->value == 2.0);
+        assert(db.get<muser_cell*>(3)->value == 5.0);
+        assert(db.get<muser_cell*>(4)->value == 3.0);
+        assert(db.get<muser_cell*>(5)->value == 4.0);
+    }
+
+    {
+        // set_cell() to merge 2 blocks.
+        mtv_type db(3);
+        db.set(0, static_cast<uint64_t>(23));
+        db.set(1, new muser_cell(2.1));
+        db.set(2, new muser_cell(3.1));
+
+        db.set(0, new muser_cell(4.2)); // merge
+        assert(db.block_size() == 1);
+        assert(db.get<muser_cell*>(0)->value == 4.2);
+        assert(db.get<muser_cell*>(1)->value == 2.1);
+        assert(db.get<muser_cell*>(2)->value == 3.1);
+    }
+
+    {
+        // insert_cells() to split block into two.
+        mtv_type db(2);
+        db.set(0, new muser_cell(2.1));
+        db.set(1, new muser_cell(2.2));
+        double vals[] = {3.1, 3.2};
+        const double* p = &vals[0];
+        db.insert(1, p, p + 2);
+    }
+
+    {
+        // set_cells() - merge new data block with existing block below.
+        mtv_type db(6);
+        db.set(0, std::string("foo"));
+        db.set(1, std::string("baa"));
+        db.set(2, 1.1);
+        db.set(3, 1.2);
+        db.set(4, new muser_cell(2.2));
+        db.set(5, new muser_cell(2.3));
+        assert(db.block_size() == 3);
+
+        std::vector<muser_cell*> vals;
+        vals.push_back(new muser_cell(2.4));
+        vals.push_back(new muser_cell(2.5));
+        vals.push_back(new muser_cell(2.6));
+        db.set(1, vals.begin(), vals.end());
+        assert(db.block_size() == 2);
+
+        assert(db.get<std::string>(0) == "foo");
+        assert(db.get<muser_cell*>(1)->value == 2.4);
+        assert(db.get<muser_cell*>(2)->value == 2.5);
+        assert(db.get<muser_cell*>(3)->value == 2.6);
+        assert(db.get<muser_cell*>(4)->value == 2.2);
+        assert(db.get<muser_cell*>(5)->value == 2.3);
+    }
+
+    {
+        // set_cells() - merge new data block with existing block below, but
+        // it overwrites the upper cell.
+        mtv_type db(6);
+        db.set(0, std::string("foo"));
+        db.set(1, std::string("baa"));
+        db.set(2, 1.1);
+        db.set(3, new muser_cell(2.1));
+        db.set(4, new muser_cell(2.2));
+        db.set(5, new muser_cell(2.3));
+        std::vector<muser_cell*> vals;
+        vals.push_back(new muser_cell(2.4));
+        vals.push_back(new muser_cell(2.5));
+        vals.push_back(new muser_cell(2.6));
+        db.set(1, vals.begin(), vals.end());
+        assert(db.block_size() == 2);
+
+        assert(db.get<std::string>(0) == "foo");
+        assert(db.get<muser_cell*>(1)->value == 2.4);
+        assert(db.get<muser_cell*>(2)->value == 2.5);
+        assert(db.get<muser_cell*>(3)->value == 2.6);
+        assert(db.get<muser_cell*>(4)->value == 2.2);
+        assert(db.get<muser_cell*>(5)->value == 2.3);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(2, new muser_cell(1.0));
+        db.set(1, new muser_cell(1.0));
+        assert(db.block_size() == 1);
+    }
+
+    {
+        mtv_type db(10);
+        for (size_t i = 0; i < 10; ++i)
+            db.set(i, new muser_cell(1.1));
+
+        std::vector<double> doubles(3, 2.2);
+        db.set(3, doubles.begin(), doubles.end());
+        assert(db.block_size() == 3);
+
+        std::vector<muser_cell*> cells;
+        cells.push_back(new muser_cell(2.1));
+        cells.push_back(new muser_cell(2.2));
+        cells.push_back(new muser_cell(2.3));
+        db.set(3, cells.begin(), cells.end());
+        assert(db.block_size() == 1);
+        assert(db.get<muser_cell*>(0)->value == 1.1);
+        assert(db.get<muser_cell*>(1)->value == 1.1);
+        assert(db.get<muser_cell*>(2)->value == 1.1);
+        assert(db.get<muser_cell*>(3)->value == 2.1);
+        assert(db.get<muser_cell*>(4)->value == 2.2);
+        assert(db.get<muser_cell*>(5)->value == 2.3);
+        assert(db.get<muser_cell*>(6)->value == 1.1);
+        assert(db.get<muser_cell*>(7)->value == 1.1);
+        assert(db.get<muser_cell*>(8)->value == 1.1);
+        assert(db.get<muser_cell*>(9)->value == 1.1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, new muser_cell(1.0));
+        db.set(1, new muser_cell(2.0));
+        db.set(2, new muser_cell(3.0));
+        db.set_empty(1, 1);
+        assert(db.block_size() == 3);
+        assert(db.get<muser_cell*>(0)->value == 1.0);
+        assert(db.is_empty(1));
+        assert(db.get<muser_cell*>(2)->value == 3.0);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(1, new muser_cell(3.3));
+        assert(db.block_size() == 3);
+        db.set_empty(1, 1);
+        assert(db.block_size() == 1);
+    }
+
+    {
+        // Release an element.
+        mtv_type db(1);
+        muser_cell* p1 = new muser_cell(4.5);
+        db.set(0, p1);
+        muser_cell* p2 = db.release<muser_cell*>(0);
+        assert(p1 == p2);
+        assert(p2->value == 4.5);
+        assert(db.is_empty(0));
+        delete p2;
+
+        db = mtv_type(2);
+        db.set(0, new muser_cell(23.3));
+        assert(db.block_size() == 2);
+        p2 = db.release<muser_cell*>(0);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.block_size() == 1);
+        delete p2;
+
+        db = mtv_type(2);
+        db.set(0, new muser_cell(1.2));
+        db.set(1, new muser_cell(1.3));
+
+        p2 = db.release<muser_cell*>(0);
+        assert(db.is_empty(0));
+        assert(!db.is_empty(1));
+        assert(p2->value == 1.2);
+        delete p2;
+
+        db.set(0, new muser_cell(1.4));
+        p2 = db.release<muser_cell*>(1);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(p2->value == 1.3);
+        delete p2;
+
+        db = mtv_type(3);
+        db.set(0, new muser_cell(2.1));
+        db.set(1, new muser_cell(2.2));
+        db.set(2, new muser_cell(2.3));
+
+        p2 = db.release<muser_cell*>(1);
+        assert(p2->value == 2.2);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+
+        delete p2;
+
+        db = mtv_type(3);
+        db.set(0, new muser_cell(2.1));
+        db.set(1, new muser_cell(2.2));
+        db.set(2, new muser_cell(2.3));
+        db.set_empty(0, 2); // Make sure this doesn't release anything.
+
+        // Release with position hint.
+        db = mtv_type(4);
+        db.set(0, new muser_cell(4.5));
+        db.set(1, new muser_cell(4.6));
+        db.set(3, new muser_cell(5.1));
+
+        mtv_type::iterator pos = db.release(0, p1);
+        assert(pos == db.begin());
+        pos = db.release(pos, 3, p2);
+        ++pos;
+        assert(pos == db.end());
+        assert(p1->value == 4.5);
+        assert(p2->value == 5.1);
+        assert(db.block_size() == 3);
+        assert(db.is_empty(0));
+        assert(db.get<muser_cell*>(1)->value == 4.6);
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        delete p1;
+        delete p2;
+    }
+
+    {
+        mtv_type db(5);
+
+        db.set(1, new muser_cell(1.1));
+        db.set(2, new muser_cell(1.2));
+        db.set(3, new muser_cell(1.3));
+
+        db.set(1, 2.1); // Don't leak the overwritten muser_cell instance.
+        db.set(2, 2.2); // ditto
+    }
+
+    {
+        mtv_type db(4);
+        db.set(0, new muser_cell(1.1));
+        db.set(1, new muser_cell(1.2));
+        db.set(2, new muser_cell(1.3));
+
+        db.set(2, 2.1); // Don't leak the overwritten muser_cell instance.
+        db.set(1, 2.0); // ditto
+    }
+
+    {
+        mtv_type db(8);
+        db.set(3, new muser_cell(1.1));
+        db.set(4, new muser_cell(1.2));
+        db.set(5, 1.3);
+
+        db.set(4, 2.2); // Overwrite muser_cell and don't leak.
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/tc/misc.inl b/test/multi_type_vector/custom/tc/misc.inl
new file mode 100644
index 0000000..7b540ff
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/misc.inl
@@ -0,0 +1,200 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_misc_types()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mdds::mtv::element_t ct;
+
+    // Basic types
+    ct = mtv_type::get_element_type(double(12.3));
+    assert(ct == mdds::mtv::element_type_double);
+    ct = mtv_type::get_element_type(std::string());
+    assert(ct == mdds::mtv::element_type_string);
+    ct = mtv_type::get_element_type(static_cast<uint64_t>(12));
+    assert(ct == mdds::mtv::element_type_uint64);
+    ct = mtv_type::get_element_type(true);
+    assert(ct == mdds::mtv::element_type_boolean);
+    ct = mtv_type::get_element_type(false);
+    assert(ct == mdds::mtv::element_type_boolean);
+
+    // Custom cell type
+    user_cell* p = nullptr;
+    ct = mtv_type::get_element_type(p);
+    assert(ct == element_type_user_block && ct >= mdds::mtv::element_type_user_start);
+    ct = mtv_type::get_element_type(static_cast<muser_cell*>(nullptr));
+    assert(ct == element_type_muser_block && ct >= mdds::mtv::element_type_user_start);
+    ct = mtv_fruit_type::get_element_type(unknown_fruit);
+    assert(ct == element_type_fruit_block && ct >= mdds::mtv::element_type_user_start);
+}
+
+void mtv_test_misc_block_identifier()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    assert(user_cell_block::block_type == element_type_user_block);
+    assert(muser_cell_block::block_type == element_type_muser_block);
+    assert(fruit_block::block_type == element_type_fruit_block);
+    assert(date_block::block_type == element_type_date_block);
+}
+
+void mtv_test_misc_custom_block_func1()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_fruit_type db(10);
+    db.set(0, apple);
+    db.set(1, orange);
+    db.set(2, mango);
+    db.set(3, peach);
+    assert(db.block_size() == 2);
+    assert(db.get_type(0) == element_type_fruit_block);
+    assert(db.get<my_fruit_type>(0) == apple);
+    assert(db.get<my_fruit_type>(1) == orange);
+    assert(db.get<my_fruit_type>(2) == mango);
+    assert(db.get<my_fruit_type>(3) == peach);
+    db.set<int>(1, 234);
+    assert(db.block_size() == 4);
+    db.set(1, apple);
+    assert(db.block_size() == 2);
+}
+
+void mtv_test_misc_custom_block_func3()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv3_type db(10);
+
+    // Insert custom elements.
+    db.set(0, new muser_cell(12.3));
+    db.set(1, apple);
+    db.set(2, date(1989, 12, 13));
+    db.set(3, date(2011, 8, 7));
+    assert(db.get_type(0) == element_type_muser_block);
+    assert(db.get_type(1) == element_type_fruit_block);
+    assert(db.get_type(2) == element_type_date_block);
+    assert(db.get_type(3) == element_type_date_block);
+    assert(db.get<muser_cell*>(0)->value == 12.3);
+    assert(db.get<my_fruit_type>(1) == apple);
+    assert(db.get<date>(2).year == 1989);
+    assert(db.get<date>(2).month == 12);
+    assert(db.get<date>(2).day == 13);
+    assert(db.get<date>(3).year == 2011);
+    assert(db.get<date>(3).month == 8);
+    assert(db.get<date>(3).day == 7);
+    assert(db.block_size() == 4);
+
+    // We should still support the primitive types.
+    db.set(8, 34.56);
+    assert(db.get<double>(8) == 34.56);
+}
+
+void mtv_test_misc_release()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(3);
+    muser_cell c1(1.2), c2(1.3); // allocated on the stack.
+    db.set(0, &c1);
+    db.set(2, &c2);
+    db.release(); // Prevent invalid free when db goes out of scope.
+
+    // Variant with no argument should make the container empty after the call.
+    assert(db.empty());
+
+    db.push_back(new muser_cell(10.0));
+    db.push_back(&c1);
+    db.push_back(&c2);
+    db.push_back(new muser_cell(10.1));
+
+    assert(db.size() == 4);
+    assert(db.block_size() == 1);
+
+    // Release those allocated on the stack to avoid double deletion.
+    mtv_type::iterator it = db.release_range(1, 2);
+
+    // Check the integrity of the returned iterator.
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 2);
+    mtv_type::iterator check = it;
+    --check;
+    assert(check == db.begin());
+    check = it;
+    ++check;
+    ++check;
+    assert(check == db.end());
+
+    db.push_back(new muser_cell(10.2));
+    assert(db.size() == 5);
+
+    muser_cell* p1 = db.get<muser_cell*>(3);
+    muser_cell* p2 = db.get<muser_cell*>(4);
+    assert(p1->value == 10.1);
+    assert(p2->value == 10.2);
+
+    // Pass iterator as a position hint.
+    it = db.release_range(it, 3, 4);
+    assert(db.block_size() == 2);
+
+    // Check the returned iterator.
+    check = it;
+    --check;
+    assert(check == db.begin());
+    assert(check->type == element_type_muser_block);
+    assert(check->size == 1);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 4);
+    ++it;
+    assert(it == db.end());
+
+    // It should be safe to delete these instances now that they've been released.
+    delete p1;
+    delete p2;
+}
+
+void mtv_test_misc_construction_with_array()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        std::vector<muser_cell*> vals;
+        vals.push_back(new muser_cell(2.1));
+        vals.push_back(new muser_cell(2.2));
+        vals.push_back(new muser_cell(2.3));
+        mtv_type db(vals.size(), vals.begin(), vals.end());
+
+        db.set(1, 10.2); // overwrite.
+        assert(db.size() == 3);
+        assert(db.block_size() == 3);
+        assert(db.get<muser_cell*>(0)->value == 2.1);
+        assert(db.get<double>(1) == 10.2);
+        assert(db.get<muser_cell*>(2)->value == 2.3);
+
+        // Now those heap objects are owned by the container.  Clearing the
+        // array shouldn't leak.
+        vals.clear();
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/tc/swap.inl b/test/multi_type_vector/custom/tc/swap.inl
new file mode 100644
index 0000000..1337915
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/swap.inl
@@ -0,0 +1,184 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_swap()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv3_type db1(5), db2(2);
+    db1.set(0, new muser_cell(1.1));
+    db1.set(1, new muser_cell(1.2));
+    db1.set(2, new muser_cell(1.3));
+    db1.set(3, new muser_cell(1.4));
+    db1.set(4, new muser_cell(1.5));
+
+    db2.set(0, std::string("A"));
+    db2.set(1, std::string("B"));
+
+    db1.swap(2, 3, db2, 0);
+
+    // swap blocks of equal size, one managed, and one default.
+
+    db1.clear();
+    db1.resize(10);
+    db2.clear();
+    db2.resize(10);
+
+    db1.set(3, 2.1);
+    db1.set(4, 2.2);
+    db1.set(5, 2.3);
+
+    db2.set(3, new muser_cell(3.1));
+    db2.set(4, new muser_cell(3.2));
+    db2.set(5, new muser_cell(3.3));
+
+    db2.swap(3, 5, db1, 3);
+
+    assert(db1.size() == 10);
+    assert(db1.block_size() == 3);
+    assert(db2.size() == 10);
+    assert(db2.block_size() == 3);
+
+    assert(db1.get<muser_cell*>(3)->value == 3.1);
+    assert(db1.get<muser_cell*>(4)->value == 3.2);
+    assert(db1.get<muser_cell*>(5)->value == 3.3);
+    assert(db2.get<double>(3) == 2.1);
+    assert(db2.get<double>(4) == 2.2);
+    assert(db2.get<double>(5) == 2.3);
+
+    db2.swap(3, 5, db1, 3);
+
+    assert(db1.get<double>(3) == 2.1);
+    assert(db1.get<double>(4) == 2.2);
+    assert(db1.get<double>(5) == 2.3);
+    assert(db2.get<muser_cell*>(3)->value == 3.1);
+    assert(db2.get<muser_cell*>(4)->value == 3.2);
+    assert(db2.get<muser_cell*>(5)->value == 3.3);
+
+    // Same as above, except that the source segment splits the block into 2.
+
+    db1.clear();
+    db1.resize(10);
+    db2.clear();
+    db2.resize(10);
+
+    db1.set(3, 2.1);
+    db1.set(4, 2.2);
+
+    db2.set(3, new muser_cell(3.1));
+    db2.set(4, new muser_cell(3.2));
+    db2.set(5, new muser_cell(3.3));
+
+    db2.swap(3, 4, db1, 3);
+
+    // Another scenario that used to crash on double delete.
+
+    db1.clear();
+    db1.resize(10);
+    db2.clear();
+    db2.resize(10);
+
+    db1.set(2, new muser_cell(4.1));
+    db1.set(3, 4.2);
+    db1.set(4, new muser_cell(4.3));
+
+    db2.set(3, new muser_cell(6.1));
+    db2.set(4, 6.2);
+    db2.set(5, 6.3);
+
+    assert(db1.get<muser_cell*>(2)->value == 4.1);
+    assert(db1.get<double>(3) == 4.2);
+    assert(db1.get<muser_cell*>(4)->value == 4.3);
+
+    assert(db2.get<muser_cell*>(3)->value == 6.1);
+    assert(db2.get<double>(4) == 6.2);
+    assert(db2.get<double>(5) == 6.3);
+
+    db2.swap(4, 4, db1, 4);
+
+    assert(db1.get<muser_cell*>(2)->value == 4.1);
+    assert(db1.get<double>(3) == 4.2);
+    assert(db1.get<double>(4) == 6.2);
+
+    assert(db2.get<muser_cell*>(3)->value == 6.1);
+    assert(db2.get<muser_cell*>(4)->value == 4.3);
+    assert(db2.get<double>(5) == 6.3);
+
+    // One more on double deletion...
+
+    db1.clear();
+    db1.resize(10);
+    db2.clear();
+    db2.resize(10);
+
+    db1.set(0, 2.1);
+    db1.set(1, 2.2);
+    db1.set(2, 2.3);
+    db1.set(3, new muser_cell(4.5));
+
+    db2.set(2, new muser_cell(3.1));
+    db2.set(3, new muser_cell(3.2));
+    db2.set(4, new muser_cell(3.3));
+
+    db1.swap(2, 2, db2, 3);
+
+    assert(db1.get<double>(0) == 2.1);
+    assert(db1.get<double>(1) == 2.2);
+    assert(db1.get<muser_cell*>(2)->value == 3.2);
+    assert(db1.get<muser_cell*>(3)->value == 4.5);
+
+    assert(db2.get<muser_cell*>(2)->value == 3.1);
+    assert(db2.get<double>(3) == 2.3);
+    assert(db2.get<muser_cell*>(4)->value == 3.3);
+}
+
+void mtv_test_swap_2()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv3_type db1(3), db2(3);
+
+    db1.set(0, new muser_cell(1.1));
+    db1.set(1, new muser_cell(1.2));
+
+    db2.set(0, 1.2);
+    db2.set(1, std::string("foo"));
+
+    // Repeat the same swap twice.
+    db1.swap(0, 1, db2, 0);
+    assert(db2.get<muser_cell*>(0)->value == 1.1);
+    assert(db2.get<muser_cell*>(1)->value == 1.2);
+    assert(db1.get<double>(0) == 1.2);
+    assert(db1.get<std::string>(1) == "foo");
+
+    db1.swap(0, 1, db2, 0);
+    assert(db1.get<muser_cell*>(0)->value == 1.1);
+    assert(db1.get<muser_cell*>(1)->value == 1.2);
+    assert(db2.get<double>(0) == 1.2);
+    assert(db2.get<std::string>(1) == "foo");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/custom/tc/transfer.inl b/test/multi_type_vector/custom/tc/transfer.inl
new file mode 100644
index 0000000..24d3f79
--- /dev/null
+++ b/test/multi_type_vector/custom/tc/transfer.inl
@@ -0,0 +1,428 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_transfer()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db1(3), db2(4); // db2 is larger than db1.
+    db1.set(0, new muser_cell(1.1));
+    db1.set(1, new muser_cell(1.2));
+    db1.set(2, new muser_cell(1.3));
+    assert(db1.block_size() == 1);
+
+    try
+    {
+        db1.transfer(0, 1, db1, 0);
+        assert(!"Exception should have been thrown");
+    }
+    catch (const mdds::invalid_arg_error&)
+    {
+        // Good.
+    }
+
+    // Do the transfer.
+    db1.transfer(0, 2, db2, 0);
+
+    // Now db1 should be totally empty.
+    assert(db1.block_size() == 1);
+    mtv_type::iterator check = db1.begin();
+    assert(check != db1.end());
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(check->size == 3);
+
+    assert(db2.block_size() == 2);
+    assert(db2.get<muser_cell*>(0)->value == 1.1);
+    assert(db2.get<muser_cell*>(1)->value == 1.2);
+    assert(db2.get<muser_cell*>(2)->value == 1.3);
+    assert(db2.is_empty(3));
+
+    // Transfer back to db1. This should make db2 to be totally empty again.
+    db2.transfer(0, 2, db1, 0);
+    assert(db2.block_size() == 1);
+    check = db2.begin();
+    assert(check != db2.end());
+    assert(check->size == 4);
+    assert(check->type == mdds::mtv::element_type_empty);
+
+    assert(db1.block_size() == 1);
+    assert(db1.get<muser_cell*>(0)->value == 1.1);
+    assert(db1.get<muser_cell*>(1)->value == 1.2);
+    assert(db1.get<muser_cell*>(2)->value == 1.3);
+
+    // Now, transfer only the top 2 elements.
+    db1.transfer(0, 1, db2, 0);
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.get<muser_cell*>(2)->value == 1.3);
+
+    assert(db2.get<muser_cell*>(0)->value == 1.1);
+    assert(db2.get<muser_cell*>(1)->value == 1.2);
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+
+    // .. and back.
+    db2.transfer(0, 1, db1, 0);
+    assert(db1.block_size() == 1);
+    assert(db1.get<muser_cell*>(0)->value == 1.1);
+    assert(db1.get<muser_cell*>(1)->value == 1.2);
+    assert(db1.get<muser_cell*>(2)->value == 1.3);
+
+    assert(db2.block_size() == 1);
+    check = db2.begin();
+    assert(check != db2.end());
+    assert(check->size == 4);
+    assert(check->type == mdds::mtv::element_type_empty);
+
+    db1 = mtv_type(4);
+    db2 = mtv_type(4);
+    db2.set(1, new muser_cell(2.1));
+    db2.set(2, new muser_cell(2.2));
+    assert(db2.block_size() == 3);
+    db1.transfer(0, 1, db2, 1); // This causes db2's 3 blocks to merge into one.
+    assert(db2.block_size() == 1);
+    check = db2.begin();
+    assert(check != db2.end());
+    assert(check->size == 4);
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(db1.block_size() == 1);
+    check = db1.begin();
+    assert(check != db1.end());
+    assert(check->size == 4);
+    assert(check->type == mdds::mtv::element_type_empty);
+
+    db2.set(0, new muser_cell(3.1));
+    assert(db2.block_size() == 2);
+
+    db1.set(1, new muser_cell(3.2));
+    db1.set(2, new muser_cell(3.3));
+    db1.set(3, new muser_cell(3.4));
+    assert(db1.block_size() == 2);
+
+    db1.transfer(1, 2, db2, 1);
+    assert(db1.block_size() == 2);
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.get<muser_cell*>(3)->value == 3.4);
+    assert(db2.block_size() == 2);
+    assert(db2.get<muser_cell*>(0)->value == 3.1);
+    assert(db2.get<muser_cell*>(1)->value == 3.2);
+    assert(db2.get<muser_cell*>(2)->value == 3.3);
+    assert(db2.is_empty(3));
+
+    db1 = mtv_type(3);
+    db2 = mtv_type(3);
+    db1.set(1, new muser_cell(4.2));
+    db2.set(0, new muser_cell(4.1));
+    db2.set(2, new muser_cell(4.3));
+
+    db1.transfer(1, 1, db2, 1);
+    assert(db1.block_size() == 1);
+    check = db1.begin();
+    assert(check != db1.end());
+    assert(check->size == 3);
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(db2.block_size() == 1);
+    assert(db2.get<muser_cell*>(0)->value == 4.1);
+    assert(db2.get<muser_cell*>(1)->value == 4.2);
+    assert(db2.get<muser_cell*>(2)->value == 4.3);
+
+    // Transfer to middle of block.
+    db1 = mtv_type(3);
+    db2 = mtv_type(3);
+    db1.set(0, new muser_cell(5.2));
+    assert(db1.block_size() == 2);
+    db1.transfer(0, 0, db2, 1);
+    assert(db1.block_size() == 1);
+    check = db1.begin();
+    assert(check != db1.end());
+    assert(check->size == 3);
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(db2.block_size() == 3);
+    assert(db2.is_empty(0));
+    assert(db2.get<muser_cell*>(1)->value == 5.2);
+    assert(db2.is_empty(2));
+
+    db1 = mtv_type(2);
+    db2 = mtv_type(3);
+    db1.set(0, new muser_cell(11.1));
+    db1.set(1, new muser_cell(11.2));
+    db1.transfer(1, 1, db2, 1);
+    assert(db1.block_size() == 2);
+    assert(db1.get<muser_cell*>(0)->value == 11.1);
+    assert(db1.is_empty(1));
+    assert(db2.block_size() == 3);
+    assert(db2.is_empty(0));
+    assert(db2.get<muser_cell*>(1)->value == 11.2);
+    assert(db2.is_empty(2));
+
+    // Transfer to bottom of block.
+    db1 = mtv_type(4);
+    db2 = mtv_type(5);
+    db1.set(0, new muser_cell(6.1));
+    db1.set(1, new muser_cell(6.2));
+    db1.transfer(0, 1, db2, 3);
+    assert(db1.block_size() == 1);
+    check = db1.begin();
+    assert(check != db1.end());
+    assert(check->size == 4);
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(db2.block_size() == 2);
+    assert(db2.is_empty(0));
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.get<muser_cell*>(3)->value == 6.1);
+    assert(db2.get<muser_cell*>(4)->value == 6.2);
+
+    // Transfer multiple blocks.  Very simple use case.
+    db1 = mtv_type(4);
+    db2 = mtv_type(3);
+    db1.set(1, new muser_cell(10.1));
+    db1.set(3, new muser_cell(10.2));
+    db1.transfer(1, 3, db2, 0);
+
+    // db1 should be completely empty.
+    assert(db1.block_size() == 1);
+    check = db1.begin();
+    assert(check != db1.end());
+    assert(check->size == 4);
+    assert(check->type == mdds::mtv::element_type_empty);
+
+    assert(db2.block_size() == 3);
+    assert(db2.get<muser_cell*>(0)->value == 10.1);
+    assert(db2.is_empty(1));
+    assert(db2.get<muser_cell*>(2)->value == 10.2);
+
+    // Multiple-block transfer that involves merging.
+    db1 = mtv_type(5);
+    db2 = mtv_type(5);
+    db1.set(0, new muser_cell(0.1));
+    db1.set(1, new muser_cell(0.2));
+    db1.set(3, new muser_cell(0.3));
+    db1.set(4, new muser_cell(0.4));
+
+    db2.set(0, new muser_cell(1.1));
+    db2.set(4, new muser_cell(1.2));
+
+    mtv_type::iterator it = db1.transfer(1, 3, db2, 1);
+    assert(db1.block_size() == 3);
+    assert(db1.get<muser_cell*>(0)->value == 0.1);
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.get<muser_cell*>(4)->value == 0.4);
+
+    assert(db2.block_size() == 3);
+    assert(db2.get<muser_cell*>(0)->value == 1.1);
+    assert(db2.get<muser_cell*>(1)->value == 0.2);
+    assert(db2.is_empty(2));
+    assert(db2.get<muser_cell*>(3)->value == 0.3);
+    assert(db2.get<muser_cell*>(4)->value == 1.2);
+
+    assert(it != db1.end());
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_empty);
+    it = db1.transfer(it, 4, 4, db2, 2); // Transfer single element at 4.
+    assert(db1.block_size() == 2);
+    assert(db1.get<muser_cell*>(0)->value == 0.1);
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+
+    assert(db2.block_size() == 1);
+    assert(db2.get<muser_cell*>(0)->value == 1.1);
+    assert(db2.get<muser_cell*>(1)->value == 0.2);
+    assert(db2.get<muser_cell*>(2)->value == 0.4);
+    assert(db2.get<muser_cell*>(3)->value == 0.3);
+    assert(db2.get<muser_cell*>(4)->value == 1.2);
+
+    assert(it != db1.end());
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db1.end());
+
+    // Multi-block transfer to the top part of destination block.
+    db1 = mtv_type(5);
+    db2 = mtv_type(5);
+    db1.set(0, new muser_cell(-1.1));
+    db1.set(1, new muser_cell(-2.1));
+    db1.set(2, new muser_cell(-3.1));
+    db1.set(3, std::string("foo"));
+    db1.set(4, new muser_cell(-5.1));
+    db2.set(1, true);
+    db2.set(2, false);
+    db2.set(3, true);
+    it = db1.transfer(2, 3, db2, 2);
+    assert(it != db1.end());
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_empty);
+    std::advance(it, 2);
+    assert(it == db1.end());
+    assert(db1.block_size() == 3);
+    assert(db1.get<muser_cell*>(0)->value == -1.1);
+    assert(db1.get<muser_cell*>(1)->value == -2.1);
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.get<muser_cell*>(4)->value == -5.1);
+
+    assert(db2.block_size() == 5);
+    assert(db2.is_empty(0));
+    assert(db2.get<bool>(1) == true);
+    assert(db2.get<muser_cell*>(2)->value == -3.1);
+    assert(db2.get<std::string>(3) == "foo");
+    assert(db2.is_empty(4));
+
+    // Multi-block transfer to the bottom part of destination block.
+    db1 = mtv_type(10);
+    db2 = mtv_type(10);
+    db1.set(0, new muser_cell(2.1));
+    db1.set(1, new muser_cell(2.2));
+    db1.set(2, int8_t('a'));
+    db1.set(3, int8_t('b'));
+    db2.set(0, true);
+    db2.set(1, false);
+
+    it = db1.transfer(0, 2, db2, 7);
+    assert(it != db1.end());
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it != db1.end());
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_int8);
+    ++it;
+    assert(it != db1.end());
+    assert(it->size == 6);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db1.end());
+    assert(db1.block_size() == 3);
+    assert(db1.get<int8_t>(3) == 'b');
+
+    assert(db2.block_size() == 4);
+    assert(db2.get<bool>(0) == true);
+    assert(db2.get<bool>(1) == false);
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+    assert(db2.is_empty(5));
+    assert(db2.is_empty(6));
+    assert(db2.get<muser_cell*>(7)->value == 2.1);
+    assert(db2.get<muser_cell*>(8)->value == 2.2);
+    assert(db2.get<int8_t>(9) == 'a');
+
+    // Multi-block transfer to the middle part of destination block.
+    db1 = mtv_type(10);
+    db2 = mtv_type(10);
+    db2.set(0, true);
+    db2.set(9, true);
+    db1.set(3, new muser_cell(2.4));
+    db1.set(4, new muser_cell(2.5));
+    db1.set(5, std::string("abc"));
+    db1.set(6, new muser_cell(2.6));
+    db1.set(7, new muser_cell(2.7));
+    db1.set(8, true);
+    it = db1.transfer(3, 6, db2, 2);
+    assert(it != db1.end());
+    assert(it->size == 7);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it != db1.end());
+    assert(it->size == 1);
+    assert(it->type == element_type_muser_block);
+    ++it;
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db1.end());
+
+    assert(db1.block_size() == 4);
+    assert(db1.is_empty(6));
+    assert(db1.get<muser_cell*>(7)->value == 2.7);
+    assert(db1.get<bool>(8) == true);
+    assert(db1.is_empty(9));
+
+    assert(db2.block_size() == 7);
+    assert(db2.get<bool>(0) == true);
+    assert(db2.is_empty(1));
+    assert(db2.get<muser_cell*>(2)->value == 2.4);
+    assert(db2.get<muser_cell*>(3)->value == 2.5);
+    assert(db2.get<std::string>(4) == "abc");
+    assert(db2.get<muser_cell*>(5)->value == 2.6);
+    assert(db2.is_empty(6));
+    assert(db2.is_empty(7));
+    assert(db2.is_empty(8));
+    assert(db2.get<bool>(9) == true);
+
+    db1 = mtv_type(10);
+    db2 = mtv_type(10);
+    db1.set(3, true);
+    db2.set(3, std::string("test"));
+    db1.transfer(0, 6, db2, 0);
+    assert(db1.block_size() == 1);
+    check = db1.begin();
+    assert(check != db1.end());
+    assert(check->size == 10);
+    assert(check->type == mdds::mtv::element_type_empty);
+    ++check;
+    assert(check == db1.end());
+    assert(db2.block_size() == 3);
+    assert(db2.is_empty(0));
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.get<bool>(3) == true);
+    assert(db2.is_empty(4));
+    assert(db2.is_empty(5));
+    assert(db2.is_empty(6));
+    assert(db2.is_empty(7));
+    assert(db2.is_empty(8));
+    assert(db2.is_empty(9));
+
+    // Make sure that transfer will overwrite cells in managed blocks.
+    db1 = mtv_type(3);
+    db2 = mtv_type(3);
+    db1.set(0, new muser_cell(1.1));
+    db1.set(1, new muser_cell(1.2));
+    db1.set(2, new muser_cell(1.3));
+
+    db2.set(1, new muser_cell(2.1)); // This element will be overwritten.
+    db1.transfer(0, 2, db2, 0);
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db2.get<muser_cell*>(0)->value == 1.1);
+    assert(db2.get<muser_cell*>(1)->value == 1.2);
+    assert(db2.get<muser_cell*>(2)->value == 1.3);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/debug-util/Makefile.am b/test/multi_type_vector/debug-util/Makefile.am
new file mode 100644
index 0000000..3e54dfd
--- /dev/null
+++ b/test/multi_type_vector/debug-util/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = soa
diff --git a/test/multi_type_vector/debug-util/Makefile.in b/test/multi_type_vector/debug-util/Makefile.in
new file mode 100644
index 0000000..47baab7
--- /dev/null
+++ b/test/multi_type_vector/debug-util/Makefile.in
@@ -0,0 +1,638 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
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+	$(AM_V_CXXLD)$(CXXLINK) $(test_trace_OBJECTS) $(test_trace_LDADD) $(LIBS)
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+	  if test $$# -gt 0; then \
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+	esac; \
+	for i in $$list; do \
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+# Recover from deleted '.trs' file; this should ensure that
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+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
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+	 else								\
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+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/debug-util/soa/test_trace.cpp b/test/multi_type_vector/debug-util/soa/test_trace.cpp
new file mode 100644
index 0000000..6f32936
--- /dev/null
+++ b/test/multi_type_vector/debug-util/soa/test_trace.cpp
@@ -0,0 +1,454 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include <iostream>
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/soa/main.hpp>
+
+using mdds::mtv::trace_method_t;
+
+namespace {
+
+bool starts_with(std::string_view s, std::string_view test)
+{
+    std::string_view ss = s.substr(0, test.size());
+    return ss == test;
+}
+
+struct checked_method_props
+{
+    const void* instance = nullptr;
+    std::string function_name;
+    trace_method_t type = trace_method_t::unspecified;
+
+    bool operator==(const checked_method_props& other) const
+    {
+        return instance == other.instance && function_name == other.function_name && type == other.type;
+    }
+};
+
+std::ostream& operator<<(std::ostream& os, const checked_method_props& v)
+{
+    os << "{instance: " << v.instance << ", function_name: " << v.function_name << ", type: " << int(v.type);
+    return os;
+}
+
+bool compare(const checked_method_props& lhs, const checked_method_props& rhs)
+{
+    bool res = lhs.instance == rhs.instance && lhs.function_name == rhs.function_name && lhs.type == rhs.type;
+    if (!res)
+    {
+        std::cerr << "The two are not equal!" << std::endl;
+        std::cerr << "lhs: " << lhs << std::endl;
+        std::cerr << "rhs: " << rhs << std::endl;
+    }
+    return res;
+}
+
+class test_scope
+{
+    std::vector<checked_method_props> m_expected;
+    std::vector<checked_method_props>& m_observed;
+    int m_line_number;
+
+public:
+    test_scope(std::vector<checked_method_props>& observed, int line_number)
+        : m_observed(observed), m_line_number(line_number)
+    {
+        std::cout << "--" << std::endl;
+    }
+
+    ~test_scope()
+    {
+        if (!std::equal(m_expected.cbegin(), m_expected.cend(), m_observed.cbegin(), compare))
+        {
+            std::cerr << "test failed (line=" << m_line_number << ")" << std::endl;
+            assert(false);
+        }
+        m_observed.clear();
+    }
+
+    auto& expected()
+    {
+        return m_expected;
+    }
+};
+
+std::vector<checked_method_props> observed;
+
+struct mtv_custom_trait : public mdds::mtv::standard_element_blocks_traits
+{
+    static void trace(const mdds::mtv::trace_method_properties_t& props)
+    {
+        std::cout << "[" << props.instance << "]: {" << props.function_name << ": " << props.function_args
+                  << "}; type=" << int(props.type) << std::endl;
+
+        // Some compilers put an extra space after the 'operator'. Let's delete that extra space char.
+        std::string func_name = props.function_name;
+        if (starts_with(func_name, "operator "))
+        {
+            std::string rest = func_name.substr(9);
+            func_name = "operator" + rest;
+        }
+        observed.push_back({props.instance, func_name, props.type});
+    }
+};
+
+using mtv_type = mdds::mtv::soa::multi_type_vector<mtv_custom_trait>;
+
+} // anonymous namespace
+
+int main()
+{
+    {
+        // Random assortment of calls (1)
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10);
+            auto pos = db.begin();
+            pos = db.set<std::string>(pos, 2, "str");
+            pos = db.set<int32_t>(pos, 4, 23);
+
+            [[maybe_unused]] std::string s = db.get<std::string>(2);
+            [[maybe_unused]] bool b = db.is_empty(0);
+            [[maybe_unused]] auto t = db.get_type(2);
+            [[maybe_unused]] auto size = db.size();
+
+            db.clear();
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "begin", trace_method_t::accessor},
+                {&db, "set", trace_method_t::mutator_with_pos_hint},
+                {&db, "set", trace_method_t::mutator_with_pos_hint},
+                {&db, "get", trace_method_t::accessor},
+                {&db, "is_empty", trace_method_t::accessor},
+                {&db, "get_type", trace_method_t::accessor},
+                {&db, "size", trace_method_t::accessor},
+                {&db, "clear", trace_method_t::mutator},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // Random assortment of calls (2)
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10);
+            db.set<std::string>(2, "str");
+            db.set<int32_t>(4, 23);
+
+            [[maybe_unused]] auto bs = db.block_size();
+            [[maybe_unused]] bool b = db.empty();
+
+            [[maybe_unused]] int32_t v;
+            db.get(4, v);
+
+            db.clear();
+
+            [[maybe_unused]] auto it_end = db.end();
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "set", trace_method_t::mutator},
+                {&db, "set", trace_method_t::mutator},
+                {&db, "block_size", trace_method_t::accessor},
+                {&db, "empty", trace_method_t::accessor},
+                {&db, "get", trace_method_t::accessor},
+                {&db, "clear", trace_method_t::mutator},
+                {&db, "end", trace_method_t::accessor},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // constructors & event handler access
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db1;
+            mtv_type db2{mtv_type::event_func()}; // move
+            mtv_type::event_func ef;
+            mtv_type db3(ef); // copy
+
+            [[maybe_unused]] auto& ref_ef = db3.event_handler(); // non-const ref
+            const mtv_type& cdb3 = db3;
+            [[maybe_unused]] const auto& cref_ef = cdb3.event_handler(); // const ref
+
+            mtv_type db4(20, true); // constructor with one init value
+            std::vector<int32_t> values = {1, 2, 3, 4, 5};
+            mtv_type db5(5, values.begin(), values.end()); // constructor with a series of values
+
+            mtv_type db6(db5); // copy constructor
+            mtv_type db7(std::move(db6)); // move constructor
+
+            ts.expected() = {
+                {&db1, "multi_type_vector", trace_method_t::constructor},
+                {&db2, "multi_type_vector", trace_method_t::constructor},
+                {&db3, "multi_type_vector", trace_method_t::constructor},
+                {&db3, "event_handler", trace_method_t::accessor},
+                {&db3, "event_handler", trace_method_t::accessor},
+                {&db4, "multi_type_vector", trace_method_t::constructor},
+                {&db5, "multi_type_vector", trace_method_t::constructor},
+                {&db6, "multi_type_vector", trace_method_t::constructor},
+                {&db7, "multi_type_vector", trace_method_t::constructor},
+
+                {&db7, "~multi_type_vector", trace_method_t::destructor},
+                {&db6, "~multi_type_vector", trace_method_t::destructor},
+                {&db5, "~multi_type_vector", trace_method_t::destructor},
+                {&db4, "~multi_type_vector", trace_method_t::destructor},
+                {&db3, "~multi_type_vector", trace_method_t::destructor},
+                {&db2, "~multi_type_vector", trace_method_t::destructor},
+                {&db1, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // position methods
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10);
+            const mtv_type& cdb = db; // const ref
+            auto pos = db.position(0);
+            auto pos_hint = db.begin();
+            pos = db.position(pos_hint, 2);
+
+            [[maybe_unused]] auto cpos = cdb.position(1); // const method
+            cpos = cdb.position(pos_hint, 1);
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "position", trace_method_t::accessor},
+                {&db, "begin", trace_method_t::accessor},
+                {&db, "position", trace_method_t::accessor_with_pos_hint},
+                {&db, "position", trace_method_t::accessor},
+                {&db, "position", trace_method_t::accessor_with_pos_hint},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // set, push_back, insert, set_empty, erase, and insert_empty methods
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10);
+            std::vector<uint8_t> values = {3, 4, 5, 6};
+            auto pos_hint = db.set(2, values.begin(), values.end());
+            pos_hint = db.set(pos_hint, 4, values.begin(), values.end());
+            db.push_back<int16_t>(456);
+            db.push_back_empty();
+            pos_hint = db.insert(0, values.begin(), values.end());
+            db.insert(pos_hint, 0, values.begin(), values.end());
+            pos_hint = db.set_empty(0, 3);
+            pos_hint = db.set_empty(pos_hint, 4, 5);
+            db.erase(2, 3);
+            pos_hint = db.insert_empty(3, 10);
+            db.insert_empty(pos_hint, 15, 2);
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "set", trace_method_t::mutator},
+                {&db, "set", trace_method_t::mutator_with_pos_hint},
+                {&db, "push_back", trace_method_t::mutator},
+                {&db, "push_back_empty", trace_method_t::mutator},
+                {&db, "insert", trace_method_t::mutator},
+                {&db, "insert", trace_method_t::mutator_with_pos_hint},
+                {&db, "set_empty", trace_method_t::mutator},
+                {&db, "set_empty", trace_method_t::mutator_with_pos_hint},
+                {&db, "erase", trace_method_t::mutator},
+                {&db, "insert_empty", trace_method_t::mutator},
+                {&db, "insert_empty", trace_method_t::mutator_with_pos_hint},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // transfer
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type src(10, true), dst(10);
+            auto pos_hint = src.transfer(0, 3, dst, 0);
+            pos_hint = src.transfer(pos_hint, 6, 8, dst, 6);
+
+            ts.expected() = {
+                {&src, "multi_type_vector", trace_method_t::constructor},
+                {&dst, "multi_type_vector", trace_method_t::constructor},
+                // transfer() calls destination's size() and set_empty() internally.
+                {&src, "transfer", trace_method_t::mutator},
+                {&dst, "size", trace_method_t::accessor},
+                {&dst, "set_empty", trace_method_t::mutator},
+                // same here...
+                {&src, "transfer", trace_method_t::mutator_with_pos_hint},
+                {&dst, "size", trace_method_t::accessor},
+                {&dst, "set_empty", trace_method_t::mutator},
+                {&dst, "~multi_type_vector", trace_method_t::destructor},
+                {&src, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // release, which has 4 variants.
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10, int32_t(42));
+
+            int32_t v = db.release<int32_t>(0); // variant 1
+            auto pos_hint = db.release(1, v); // variant 2
+            pos_hint = db.release(pos_hint, 2, v); // variant 3
+            db.release(); // final variant
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "release", trace_method_t::mutator},
+                {&db, "release", trace_method_t::mutator},
+                {&db, "release", trace_method_t::mutator_with_pos_hint},
+                {&db, "release", trace_method_t::mutator},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // release_range (2 variants)
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10, int32_t(42));
+            auto pos_hint = db.release_range(0, 2);
+            pos_hint = db.release_range(pos_hint, 5, 7);
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "release_range", trace_method_t::mutator},
+                {&db, "release_range", trace_method_t::mutator_with_pos_hint},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // iterator accessors.
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db(10);
+            auto it = db.begin();
+            it = db.end();
+            const mtv_type& cdb = db;
+            auto cit = cdb.cbegin();
+            cit = cdb.cend();
+
+            cit = cdb.begin();
+            cit = cdb.end();
+
+            auto rit = db.rbegin();
+            rit = db.rend();
+
+            auto crit = cdb.rbegin();
+            crit = cdb.rend();
+
+            crit = cdb.crbegin();
+            crit = cdb.crend();
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "begin", trace_method_t::accessor},
+                {&db, "end", trace_method_t::accessor},
+                {&db, "cbegin", trace_method_t::accessor},
+                {&db, "cend", trace_method_t::accessor},
+                {&db, "begin", trace_method_t::accessor},
+                {&db, "end", trace_method_t::accessor},
+                {&db, "rbegin", trace_method_t::accessor},
+                {&db, "rend", trace_method_t::accessor},
+                {&db, "rbegin", trace_method_t::accessor},
+                {&db, "rend", trace_method_t::accessor},
+                {&db, "crbegin", trace_method_t::accessor},
+                {&db, "crend", trace_method_t::accessor},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        // resize, swap, shrink_to_fit and (non-)equality operators.
+        test_scope ts(observed, __LINE__);
+        {
+            mtv_type db;
+            db.resize(10);
+
+            mtv_type db2(10);
+            db2.swap(db);
+
+            db2.swap(0, 2, db, 0);
+            db2.shrink_to_fit();
+
+            [[maybe_unused]] bool b = db == db2;
+            b = db != db2;
+
+            ts.expected() = {
+                {&db, "multi_type_vector", trace_method_t::constructor},
+                {&db, "resize", trace_method_t::mutator},
+                {&db2, "multi_type_vector", trace_method_t::constructor},
+                {&db2, "swap", trace_method_t::mutator},
+                {&db2, "swap", trace_method_t::mutator},
+                {&db2, "shrink_to_fit", trace_method_t::mutator},
+                {&db, "operator==", trace_method_t::accessor},
+                {&db, "operator!=", trace_method_t::accessor},
+                {&db2, "~multi_type_vector", trace_method_t::destructor},
+                {&db, "~multi_type_vector", trace_method_t::destructor},
+            };
+        }
+    }
+
+    {
+        std::cout << "--" << std::endl;
+
+        // assignment operators.  These methods internally call other public
+        // methods that cannot be tested, so we only check the first trace call.
+        mtv_type db, db2;
+        observed.clear();
+        db = db2; // copy
+        checked_method_props expected{&db, "operator=", trace_method_t::mutator};
+        assert(compare(observed.at(0), expected));
+
+        observed.clear();
+        db = std::move(db2); // move
+        assert(compare(observed.at(0), expected));
+
+        observed.clear();
+    }
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/Makefile.am b/test/multi_type_vector/default/Makefile.am
new file mode 100644
index 0000000..ddfbe44
--- /dev/null
+++ b/test/multi_type_vector/default/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = aos soa tc
diff --git a/test/multi_type_vector/default/Makefile.in b/test/multi_type_vector/default/Makefile.in
new file mode 100644
index 0000000..299ffc0
--- /dev/null
+++ b/test/multi_type_vector/default/Makefile.in
@@ -0,0 +1,638 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
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+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
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+         exit 1;; \
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+  if $(am__is_gnu_make); then \
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+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
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+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
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+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+transform = $(program_transform_name)
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+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
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+	$(top_srcdir)/configure.ac
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+program_transform_name = @program_transform_name@
+psdir = @psdir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+valgrind_enabled_tools = @valgrind_enabled_tools@
+valgrind_tools = @valgrind_tools@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+test_main_SOURCES = \
+	test_construction.cpp \
+	test_basic.cpp \
+	test_empty_cells.cpp \
+	test_erase.cpp \
+	test_hints.cpp \
+	test_insert.cpp \
+	test_iterators.cpp \
+	test_iterators_insert.cpp \
+	test_iterators_set.cpp \
+	test_iterators_set_empty.cpp \
+	test_misc.cpp \
+	test_position.cpp \
+	test_set.cpp \
+	test_swap_range.cpp \
+	test_transfer.cpp \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_main_CPPFLAGS = \
+	-I$(srcdir)/.. \
+	-I$(srcdir)/../tc \
+	$(AM_CPPFLAGS)
+
+EXTRA_DIST = test_main.hpp
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .cpp .log .o .obj .test .test$(EXEEXT) .trs
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/multi_type_vector/default/aos/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/multi_type_vector/default/aos/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-checkPROGRAMS:
+	-test -z "$(check_PROGRAMS)" || rm -f $(check_PROGRAMS)
+$(top_builddir)/test/$(am__dirstamp):
+	@$(MKDIR_P) $(top_builddir)/test
+	@: > $(top_builddir)/test/$(am__dirstamp)
+$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) $(top_builddir)/test/$(DEPDIR)
+	@: > $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+$(top_builddir)/test/test_main-test_global.$(OBJEXT):  \
+	$(top_builddir)/test/$(am__dirstamp) \
+	$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+
+test-main$(EXEEXT): $(test_main_OBJECTS) $(test_main_DEPENDENCIES) $(EXTRA_test_main_DEPENDENCIES) 
+	@rm -f test-main$(EXEEXT)
+	$(AM_V_CXXLD)$(CXXLINK) $(test_main_OBJECTS) $(test_main_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+	-rm -f $(top_builddir)/test/*.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@$(top_builddir)/test/$(DEPDIR)/test_main-test_global.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_basic.Po@am__quote@ # am--include-marker
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_iterators.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_iterators_insert.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_iterators_set.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_iterators_set_empty.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_main.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_misc.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_position.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_set.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_swap_range.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test_main-test_transfer.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.cpp.o:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
+@am__fastdepCXX_TRUE@	$(CXXCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
+@am__fastdepCXX_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Po
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ $<
+
+.cpp.obj:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.obj$$||'`;\
+@am__fastdepCXX_TRUE@	$(CXXCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ `$(CYGPATH_W) '$<'` &&\
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXXCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+test_main-test_construction.o: test_construction.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_construction.o -MD -MP -MF $(DEPDIR)/test_main-test_construction.Tpo -c -o test_main-test_construction.o `test -f 'test_construction.cpp' || echo '$(srcdir)/'`test_construction.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/test_main-test_construction.Tpo $(DEPDIR)/test_main-test_construction.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='test_construction.cpp' object='test_main-test_construction.o' libtool=no @AMDEPBACKSLASH@
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -c -o test_main-test_construction.o `test -f 'test_construction.cpp' || echo '$(srcdir)/'`test_construction.cpp
+
+test_main-test_construction.obj: test_construction.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_construction.obj -MD -MP -MF $(DEPDIR)/test_main-test_construction.Tpo -c -o test_main-test_construction.obj `if test -f 'test_construction.cpp'; then $(CYGPATH_W) 'test_construction.cpp'; else $(CYGPATH_W) '$(srcdir)/test_construction.cpp'; fi`
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/test_main-test_construction.Tpo $(DEPDIR)/test_main-test_construction.Po
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+
+test_main-test_basic.o: test_basic.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_basic.o -MD -MP -MF $(DEPDIR)/test_main-test_basic.Tpo -c -o test_main-test_basic.o `test -f 'test_basic.cpp' || echo '$(srcdir)/'`test_basic.cpp
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+
+test_main-test_basic.obj: test_basic.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_basic.obj -MD -MP -MF $(DEPDIR)/test_main-test_basic.Tpo -c -o test_main-test_basic.obj `if test -f 'test_basic.cpp'; then $(CYGPATH_W) 'test_basic.cpp'; else $(CYGPATH_W) '$(srcdir)/test_basic.cpp'; fi`
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/test_main-test_basic.Tpo $(DEPDIR)/test_main-test_basic.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='test_basic.cpp' object='test_main-test_basic.obj' libtool=no @AMDEPBACKSLASH@
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+@am__fastdepCXX_FALSE@	$(AM_V_CXX@am__nodep@)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -c -o test_main-test_basic.obj `if test -f 'test_basic.cpp'; then $(CYGPATH_W) 'test_basic.cpp'; else $(CYGPATH_W) '$(srcdir)/test_basic.cpp'; fi`
+
+test_main-test_empty_cells.o: test_empty_cells.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_empty_cells.o -MD -MP -MF $(DEPDIR)/test_main-test_empty_cells.Tpo -c -o test_main-test_empty_cells.o `test -f 'test_empty_cells.cpp' || echo '$(srcdir)/'`test_empty_cells.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/test_main-test_empty_cells.Tpo $(DEPDIR)/test_main-test_empty_cells.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='test_empty_cells.cpp' object='test_main-test_empty_cells.o' libtool=no @AMDEPBACKSLASH@
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+
+test_main-test_empty_cells.obj: test_empty_cells.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_empty_cells.obj -MD -MP -MF $(DEPDIR)/test_main-test_empty_cells.Tpo -c -o test_main-test_empty_cells.obj `if test -f 'test_empty_cells.cpp'; then $(CYGPATH_W) 'test_empty_cells.cpp'; else $(CYGPATH_W) '$(srcdir)/test_empty_cells.cpp'; fi`
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+
+test_main-test_erase.o: test_erase.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(test_main_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS) -MT test_main-test_erase.o -MD -MP -MF $(DEPDIR)/test_main-test_erase.Tpo -c -o test_main-test_erase.o `test -f 'test_erase.cpp' || echo '$(srcdir)/'`test_erase.cpp
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+
+test_main-test_erase.obj: test_erase.cpp
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+
+test_main-test_hints.o: test_hints.cpp
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+	-rm -f ./$(DEPDIR)/test_main-test_iterators.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_insert.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_set.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_set_empty.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_misc.Po
+	-rm -f ./$(DEPDIR)/test_main-test_position.Po
+	-rm -f ./$(DEPDIR)/test_main-test_set.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap_range.Po
+	-rm -f ./$(DEPDIR)/test_main-test_transfer.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_main-test_global.Po
+	-rm -f ./$(DEPDIR)/test_main-test_basic.Po
+	-rm -f ./$(DEPDIR)/test_main-test_construction.Po
+	-rm -f ./$(DEPDIR)/test_main-test_empty_cells.Po
+	-rm -f ./$(DEPDIR)/test_main-test_erase.Po
+	-rm -f ./$(DEPDIR)/test_main-test_hints.Po
+	-rm -f ./$(DEPDIR)/test_main-test_insert.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_insert.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_set.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_set_empty.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_misc.Po
+	-rm -f ./$(DEPDIR)/test_main-test_position.Po
+	-rm -f ./$(DEPDIR)/test_main-test_set.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap_range.Po
+	-rm -f ./$(DEPDIR)/test_main-test_transfer.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/default/aos/test_basic.cpp b/test/multi_type_vector/default/aos/test_basic.cpp
new file mode 100644
index 0000000..8857d98
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_basic.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "basic.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_construction.cpp b/test/multi_type_vector/default/aos/test_construction.cpp
new file mode 100644
index 0000000..f36f423
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_construction.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "construction.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_empty_cells.cpp b/test/multi_type_vector/default/aos/test_empty_cells.cpp
new file mode 100644
index 0000000..1750687
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_empty_cells.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "empty_cells.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_erase.cpp b/test/multi_type_vector/default/aos/test_erase.cpp
new file mode 100644
index 0000000..d1734c3
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_erase.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "erase.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_hints.cpp b/test/multi_type_vector/default/aos/test_hints.cpp
new file mode 100644
index 0000000..daa4a0f
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_hints.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "hints.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_insert.cpp b/test/multi_type_vector/default/aos/test_insert.cpp
new file mode 100644
index 0000000..22c3d6f
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_insert.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "insert.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_iterators.cpp b/test/multi_type_vector/default/aos/test_iterators.cpp
new file mode 100644
index 0000000..3db4bd1
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_iterators.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_iterators_insert.cpp b/test/multi_type_vector/default/aos/test_iterators_insert.cpp
new file mode 100644
index 0000000..414620e
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_iterators_insert.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators_insert.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_iterators_set.cpp b/test/multi_type_vector/default/aos/test_iterators_set.cpp
new file mode 100644
index 0000000..d03489c
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_iterators_set.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators_set.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_iterators_set_empty.cpp b/test/multi_type_vector/default/aos/test_iterators_set_empty.cpp
new file mode 100644
index 0000000..c3bd67f
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_iterators_set_empty.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators_set_empty.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_main.cpp b/test/multi_type_vector/default/aos/test_main.cpp
new file mode 100644
index 0000000..3e7ad27
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_main.cpp
@@ -0,0 +1,82 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2011-2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_construction();
+        mtv_test_basic();
+        mtv_test_basic_numeric();
+        mtv_test_empty_cells();
+        mtv_test_misc_types();
+        mtv_test_misc_swap();
+        mtv_test_misc_equality();
+        mtv_test_misc_clone();
+        mtv_test_misc_resize();
+        mtv_test_misc_value_type();
+        mtv_test_misc_block_identifier();
+        mtv_test_misc_push_back();
+        mtv_test_misc_capacity();
+        mtv_test_misc_position_type_end_position();
+        mtv_test_misc_block_pos_adjustments();
+        mtv_test_erase();
+        mtv_test_insert_empty();
+        mtv_test_set_cells();
+        mtv_test_insert_cells();
+        mtv_test_iterators();
+        mtv_test_iterators_element_block();
+        mtv_test_iterators_mutable_element_block();
+        mtv_test_iterators_private_data();
+        mtv_test_iterators_set();
+        mtv_test_iterators_set_2();
+        mtv_test_iterators_insert();
+        mtv_test_iterators_insert_empty();
+        mtv_test_iterators_set_empty();
+        mtv_test_hints_set();
+        mtv_test_hints_set_cells();
+        mtv_test_hints_insert_cells();
+        mtv_test_hints_set_empty();
+        mtv_test_hints_insert_empty();
+        mtv_test_position();
+        mtv_test_position_next();
+        mtv_test_position_advance();
+        mtv_test_swap_range();
+        mtv_test_transfer();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_vector/default/aos/test_main.hpp b/test/multi_type_vector/default/aos/test_main.hpp
new file mode 100644
index 0000000..fc4adb1
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_main.hpp
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/aos/main.hpp>
+
+#include <cassert>
+#include <sstream>
+#include <vector>
+#include <deque>
+
+using mtv_type = mdds::mtv::aos::multi_type_vector<mdds::mtv::standard_element_blocks_traits>;
+
+template<typename _ValT>
+bool test_cell_insertion(mtv_type& col_db, std::size_t row, _ValT val)
+{
+    _ValT test;
+    col_db.set(row, val);
+    col_db.get(row, test);
+
+    if (val == test)
+        return true;
+
+    std::cout << "row " << row << ": value stored = " << val << "; value retrieved = " << test << std::endl;
+    return false;
+}
+
+void mtv_test_construction();
+void mtv_test_basic();
+void mtv_test_basic_numeric();
+void mtv_test_empty_cells();
+void mtv_test_misc_types();
+void mtv_test_misc_swap();
+void mtv_test_misc_equality();
+void mtv_test_misc_clone();
+void mtv_test_misc_resize();
+void mtv_test_misc_value_type();
+void mtv_test_misc_block_identifier();
+void mtv_test_misc_push_back();
+void mtv_test_misc_capacity();
+void mtv_test_misc_position_type_end_position();
+void mtv_test_misc_block_pos_adjustments();
+void mtv_test_erase();
+void mtv_test_insert_empty();
+void mtv_test_set_cells();
+void mtv_test_insert_cells();
+void mtv_test_iterators();
+void mtv_test_iterators_element_block();
+void mtv_test_iterators_mutable_element_block();
+void mtv_test_iterators_private_data();
+void mtv_test_iterators_set();
+void mtv_test_iterators_set_2();
+void mtv_test_iterators_insert();
+void mtv_test_iterators_insert_empty();
+void mtv_test_iterators_set_empty();
+void mtv_test_hints_set();
+void mtv_test_hints_set_cells();
+void mtv_test_hints_insert_cells();
+void mtv_test_hints_set_empty();
+void mtv_test_hints_insert_empty();
+void mtv_test_position();
+void mtv_test_position_next();
+void mtv_test_position_advance();
+void mtv_test_swap_range();
+void mtv_test_transfer();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_misc.cpp b/test/multi_type_vector/default/aos/test_misc.cpp
new file mode 100644
index 0000000..b8589e2
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_misc.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "misc.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_position.cpp b/test/multi_type_vector/default/aos/test_position.cpp
new file mode 100644
index 0000000..ca6b514
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_position.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "position.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_set.cpp b/test/multi_type_vector/default/aos/test_set.cpp
new file mode 100644
index 0000000..22de12d
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_set.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "set.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_swap_range.cpp b/test/multi_type_vector/default/aos/test_swap_range.cpp
new file mode 100644
index 0000000..c3e7fe4
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_swap_range.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "swap_range.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/aos/test_transfer.cpp b/test/multi_type_vector/default/aos/test_transfer.cpp
new file mode 100644
index 0000000..cc53440
--- /dev/null
+++ b/test/multi_type_vector/default/aos/test_transfer.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "transfer.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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new file mode 100644
index 0000000..106f5b7
--- /dev/null
+++ b/test/multi_type_vector/default/soa/Makefile.am
@@ -0,0 +1,36 @@
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+
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+
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+	test_construction.cpp \
+	test_basic.cpp \
+	test_empty_cells.cpp \
+	test_erase.cpp \
+	test_hints.cpp \
+	test_insert.cpp \
+	test_iterators.cpp \
+	test_iterators_insert.cpp \
+	test_iterators_set.cpp \
+	test_iterators_set_empty.cpp \
+	test_misc.cpp \
+	test_position.cpp \
+	test_set.cpp \
+	test_swap_range.cpp \
+	test_transfer.cpp \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
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new file mode 100644
index 0000000..75454d9
--- /dev/null
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+	  test $$st -eq 0 || exit 1; \
+	fi
+	@$(am__sh_e_setup); $(am__tty_colors); $(am__set_TESTS_bases); \
+	ws='[ 	]'; \
+	results=`for b in $$bases; do echo $$b.trs; done`; \
+	test -n "$$results" || results=/dev/null; \
+	all=`  grep "^$$ws*:test-result:"           $$results | wc -l`; \
+	pass=` grep "^$$ws*:test-result:$$ws*PASS"  $$results | wc -l`; \
+	fail=` grep "^$$ws*:test-result:$$ws*FAIL"  $$results | wc -l`; \
+	skip=` grep "^$$ws*:test-result:$$ws*SKIP"  $$results | wc -l`; \
+	xfail=`grep "^$$ws*:test-result:$$ws*XFAIL" $$results | wc -l`; \
+	xpass=`grep "^$$ws*:test-result:$$ws*XPASS" $$results | wc -l`; \
+	error=`grep "^$$ws*:test-result:$$ws*ERROR" $$results | wc -l`; \
+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
+	else \
+	  success=false; \
+	fi; \
+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
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+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
+check-TESTS: $(check_PROGRAMS)
+	@list='$(RECHECK_LOGS)';           test -z "$$list" || rm -f $$list
+	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
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+	log_list=`for i in $$bases; do echo $$i.log; done`; \
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+	log_list=`echo $$log_list`; trs_list=`echo $$trs_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) TEST_LOGS="$$log_list"; \
+	exit $$?;
+recheck: all $(check_PROGRAMS)
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	bases=`for i in $$bases; do echo $$i; done \
+	         | $(am__list_recheck_tests)` || exit 1; \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	log_list=`echo $$log_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
+test-main.log: test-main$(EXEEXT)
+	@p='test-main$(EXEEXT)'; \
+	b='test-main'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
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+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+.test.log:
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+	$(am__set_b); \
+	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_TEST_LOG_DRIVER_FLAGS) $(TEST_LOG_DRIVER_FLAGS) -- $(TEST_LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
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+@am__EXEEXT_TRUE@	$(am__set_b); \
+@am__EXEEXT_TRUE@	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
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+@am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
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+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-test -z "$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+	-test -z "$(top_builddir)/test/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(am__dirstamp)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+check-valgrind: check-valgrind-am
+
+check-valgrind-am: check-valgrind-local
+
+check-valgrind-drd: check-valgrind-drd-am
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+check-valgrind-sgcheck: check-valgrind-sgcheck-am
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+clean: clean-am
+
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+distclean: distclean-am
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+	-rm -f ./$(DEPDIR)/test_main-test_basic.Po
+	-rm -f ./$(DEPDIR)/test_main-test_construction.Po
+	-rm -f ./$(DEPDIR)/test_main-test_empty_cells.Po
+	-rm -f ./$(DEPDIR)/test_main-test_erase.Po
+	-rm -f ./$(DEPDIR)/test_main-test_hints.Po
+	-rm -f ./$(DEPDIR)/test_main-test_insert.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_insert.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_set.Po
+	-rm -f ./$(DEPDIR)/test_main-test_iterators_set_empty.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_misc.Po
+	-rm -f ./$(DEPDIR)/test_main-test_position.Po
+	-rm -f ./$(DEPDIR)/test_main-test_set.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap_range.Po
+	-rm -f ./$(DEPDIR)/test_main-test_transfer.Po
+	-rm -f Makefile
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+	distclean-tags
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+	-rm -f ./$(DEPDIR)/test_main-test_empty_cells.Po
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+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
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+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
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+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/default/soa/test_basic.cpp b/test/multi_type_vector/default/soa/test_basic.cpp
new file mode 100644
index 0000000..8857d98
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_basic.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "basic.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_construction.cpp b/test/multi_type_vector/default/soa/test_construction.cpp
new file mode 100644
index 0000000..f36f423
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_construction.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "construction.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_empty_cells.cpp b/test/multi_type_vector/default/soa/test_empty_cells.cpp
new file mode 100644
index 0000000..1750687
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_empty_cells.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "empty_cells.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_erase.cpp b/test/multi_type_vector/default/soa/test_erase.cpp
new file mode 100644
index 0000000..d1734c3
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_erase.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "erase.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_hints.cpp b/test/multi_type_vector/default/soa/test_hints.cpp
new file mode 100644
index 0000000..daa4a0f
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_hints.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "hints.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_insert.cpp b/test/multi_type_vector/default/soa/test_insert.cpp
new file mode 100644
index 0000000..22c3d6f
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_insert.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "insert.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_iterators.cpp b/test/multi_type_vector/default/soa/test_iterators.cpp
new file mode 100644
index 0000000..3db4bd1
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_iterators.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_iterators_insert.cpp b/test/multi_type_vector/default/soa/test_iterators_insert.cpp
new file mode 100644
index 0000000..414620e
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_iterators_insert.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators_insert.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_iterators_set.cpp b/test/multi_type_vector/default/soa/test_iterators_set.cpp
new file mode 100644
index 0000000..d03489c
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_iterators_set.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators_set.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_iterators_set_empty.cpp b/test/multi_type_vector/default/soa/test_iterators_set_empty.cpp
new file mode 100644
index 0000000..c3bd67f
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_iterators_set_empty.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "iterators_set_empty.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_main.cpp b/test/multi_type_vector/default/soa/test_main.cpp
new file mode 100644
index 0000000..9700b31
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_main.cpp
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_construction();
+        mtv_test_basic();
+        mtv_test_basic_numeric();
+        mtv_test_empty_cells();
+        mtv_test_misc_types();
+        mtv_test_misc_swap();
+        mtv_test_misc_equality();
+        mtv_test_misc_clone();
+        mtv_test_misc_resize();
+        mtv_test_misc_value_type();
+        mtv_test_misc_block_identifier();
+        mtv_test_misc_push_back();
+        mtv_test_misc_capacity();
+        mtv_test_misc_position_type_end_position();
+        mtv_test_misc_block_pos_adjustments();
+        mtv_test_erase();
+        mtv_test_insert_empty();
+        mtv_test_set_cells();
+        mtv_test_insert_cells();
+        mtv_test_iterators();
+        mtv_test_iterators_element_block();
+        mtv_test_iterators_mutable_element_block();
+        mtv_test_iterators_set();
+        mtv_test_iterators_set_2();
+        mtv_test_iterators_insert();
+        mtv_test_iterators_insert_empty();
+        mtv_test_iterators_set_empty();
+        mtv_test_hints_set();
+        mtv_test_hints_set_cells();
+        mtv_test_hints_insert_cells();
+        mtv_test_hints_set_empty();
+        mtv_test_hints_insert_empty();
+        mtv_test_position();
+        mtv_test_position_next();
+        mtv_test_position_advance();
+        mtv_test_swap_range();
+        mtv_test_transfer();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_main.hpp b/test/multi_type_vector/default/soa/test_main.hpp
new file mode 100644
index 0000000..ed6ab59
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_main.hpp
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/soa/main.hpp>
+#include <mdds/multi_type_vector/types.hpp>
+
+#include <deque>
+
+using mtv_type = mdds::mtv::soa::multi_type_vector<mdds::mtv::standard_element_blocks_traits>;
+
+template<typename _ValT>
+bool test_cell_insertion(mtv_type& col_db, std::size_t row, _ValT val)
+{
+    _ValT test;
+    col_db.set(row, val);
+    col_db.get(row, test);
+
+    if (val == test)
+        return true;
+
+    std::cout << "row " << row << ": value stored = " << val << "; value retrieved = " << test << std::endl;
+    return false;
+}
+
+void mtv_test_construction();
+void mtv_test_basic();
+void mtv_test_basic_numeric();
+void mtv_test_empty_cells();
+void mtv_test_misc_types();
+void mtv_test_misc_swap();
+void mtv_test_misc_equality();
+void mtv_test_misc_clone();
+void mtv_test_misc_resize();
+void mtv_test_misc_value_type();
+void mtv_test_misc_block_identifier();
+void mtv_test_misc_push_back();
+void mtv_test_misc_capacity();
+void mtv_test_misc_position_type_end_position();
+void mtv_test_misc_block_pos_adjustments();
+void mtv_test_erase();
+void mtv_test_insert_empty();
+void mtv_test_set_cells();
+void mtv_test_insert_cells();
+void mtv_test_iterators();
+void mtv_test_iterators_element_block();
+void mtv_test_iterators_mutable_element_block();
+void mtv_test_iterators_set();
+void mtv_test_iterators_set_2();
+void mtv_test_iterators_insert();
+void mtv_test_iterators_insert_empty();
+void mtv_test_iterators_set_empty();
+void mtv_test_hints_set();
+void mtv_test_hints_set_cells();
+void mtv_test_hints_insert_cells();
+void mtv_test_hints_set_empty();
+void mtv_test_hints_insert_empty();
+void mtv_test_position();
+void mtv_test_position_next();
+void mtv_test_position_advance();
+void mtv_test_swap_range();
+void mtv_test_transfer();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_misc.cpp b/test/multi_type_vector/default/soa/test_misc.cpp
new file mode 100644
index 0000000..b8589e2
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_misc.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "misc.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_position.cpp b/test/multi_type_vector/default/soa/test_position.cpp
new file mode 100644
index 0000000..ca6b514
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_position.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "position.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_set.cpp b/test/multi_type_vector/default/soa/test_set.cpp
new file mode 100644
index 0000000..22de12d
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_set.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "set.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_swap_range.cpp b/test/multi_type_vector/default/soa/test_swap_range.cpp
new file mode 100644
index 0000000..c3e7fe4
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_swap_range.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "swap_range.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/soa/test_transfer.cpp b/test/multi_type_vector/default/soa/test_transfer.cpp
new file mode 100644
index 0000000..cc53440
--- /dev/null
+++ b/test/multi_type_vector/default/soa/test_transfer.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "transfer.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/Makefile.am b/test/multi_type_vector/default/tc/Makefile.am
new file mode 100644
index 0000000..eced27f
--- /dev/null
+++ b/test/multi_type_vector/default/tc/Makefile.am
@@ -0,0 +1,17 @@
+EXTRA_DIST = \
+	basic.inl \
+	empty_cells.inl \
+	hints.inl \
+	iterators.inl \
+	iterators_set_empty.inl \
+	misc.inl \
+	set.inl \
+	transfer.inl \
+	construction.inl \
+	erase.inl \
+	insert.inl \
+	iterators_insert.inl \
+	iterators_set.inl \
+	position.inl \
+	swap_range.inl
+
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new file mode 100644
index 0000000..740217e
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diff --git a/test/multi_type_vector/default/tc/basic.inl b/test/multi_type_vector/default/tc/basic.inl
new file mode 100644
index 0000000..4acd299
--- /dev/null
+++ b/test/multi_type_vector/default/tc/basic.inl
@@ -0,0 +1,669 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_basic()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    bool res;
+    {
+        // Single column instance with only one row.
+        mtv_type col_db(1);
+
+        double test = -999.0;
+
+        // Empty cell has a numeric value of 0.0.
+        col_db.get(0, test);
+        assert(test == 0.0);
+
+        // Basic value setting and retrieval.
+        res = test_cell_insertion(col_db, 0, 2.0);
+        assert(res);
+    }
+
+    {
+        // Insert first value into the top row.
+        mtv_type col_db(2);
+        double test = -999.0;
+
+        // Test empty cell values.
+        col_db.get(0, test);
+        assert(test == 0.0);
+        test = 1.0;
+        col_db.get(1, test);
+        assert(test == 0.0);
+
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+
+        col_db.get(1, test);
+        assert(test == 0.0); // should be empty.
+
+        // Insert a new value to an empty row right below a non-empty one.
+        res = test_cell_insertion(col_db, 1, 7.5);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 0, 4.5);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 5.1);
+        assert(res);
+        res = test_cell_insertion(col_db, 2, 34.2);
+        assert(res);
+    }
+
+    {
+        // Insert first value into the bottom row.
+        mtv_type col_db(3);
+
+        res = test_cell_insertion(col_db, 2, 5.0); // Insert into the last row.
+        assert(res);
+
+        double test = 9;
+        col_db.get(1, test);
+        assert(test == 0.0); // should be empty.
+
+        res = test_cell_insertion(col_db, 0, 2.5);
+        assert(res);
+
+        col_db.get(1, test);
+        assert(test == 0.0); // should be empty.
+
+        res = test_cell_insertion(col_db, 1, 1.2);
+        assert(res);
+    }
+
+    {
+        // This time insert from bottom up one by one.
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 2, 1.2);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 0.2);
+        assert(res);
+        res = test_cell_insertion(col_db, 0, 23.1);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(4);
+        long order[] = {3, 1, 2, 0};
+        double val = 1.0;
+        for (size_t i = 0; i < 4; ++i, ++val)
+        {
+            res = test_cell_insertion(col_db, order[i], val);
+            assert(res);
+        }
+    }
+
+    {
+        mtv_type col_db(4);
+        long order[] = {0, 3, 1, 2};
+        double val = 1.0;
+        for (size_t i = 0; i < 4; ++i, ++val)
+        {
+            res = test_cell_insertion(col_db, order[i], val);
+            assert(res);
+        }
+    }
+
+    {
+        mtv_type col_db(4);
+        long order[] = {0, 2, 3, 1};
+        double val = 1.0;
+        for (size_t i = 0; i < 4; ++i, ++val)
+        {
+            res = test_cell_insertion(col_db, order[i], val);
+            assert(res);
+        }
+    }
+
+    {
+        mtv_type col_db(5);
+        long order[] = {0, 4, 3, 2, 1};
+        double val = 1.0;
+        for (size_t i = 0; i < 5; ++i, ++val)
+        {
+            res = test_cell_insertion(col_db, order[i], val);
+            assert(res);
+        }
+    }
+
+    {
+        // Insert first value into a middle row.
+        mtv_type col_db(10);
+        res = test_cell_insertion(col_db, 5, 5.0);
+        assert(res);
+        std::string str = "test";
+        res = test_cell_insertion(col_db, 4, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+        std::string str = "test";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 2.0);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(2);
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+        std::string str = "test";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+        std::string str = "test";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+        str = "foo";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+        res = test_cell_insertion(col_db, 2, 2.0);
+        assert(res);
+        std::string str = "foo";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+        std::string str = "foo";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+        str = "test";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(4);
+        res = test_cell_insertion(col_db, 0, 5.0);
+        assert(res);
+        std::string str = "foo";
+        res = test_cell_insertion(col_db, 3, str);
+        assert(res);
+
+        res = test_cell_insertion(col_db, 2, 2.0);
+        assert(res);
+        std::string test;
+        col_db.get(3, test); // Check the cell below.
+        assert(test == "foo");
+
+        res = test_cell_insertion(col_db, 1, -2.0);
+        assert(res);
+        test = "hmm";
+        col_db.get(3, test);
+        assert(test == "foo");
+
+        res = test_cell_insertion(col_db, 0, 7.5); // overwrite.
+        assert(res);
+
+        str = "bah";
+        res = test_cell_insertion(col_db, 0, str); // overwrite with different type.
+        assert(res);
+        double val = -999;
+        col_db.get(1, val); // Check the cell below.
+        assert(val == -2.0);
+
+        str = "alpha";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+        col_db.get(2, val); // Check the cell below.
+        assert(val == 2.0);
+
+        col_db.get(3, test);
+        assert(test == "foo");
+
+        str = "beta";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(1);
+        res = test_cell_insertion(col_db, 0, 2.0);
+        assert(res);
+        std::string str = "foo";
+        res = test_cell_insertion(col_db, 0, str);
+        assert(res);
+        res = test_cell_insertion(col_db, 0, 3.0);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(2);
+        res = test_cell_insertion(col_db, 0, 2.0);
+        assert(res);
+        std::string str = "foo";
+        res = test_cell_insertion(col_db, 0, str);
+        assert(res);
+        res = test_cell_insertion(col_db, 0, 3.0);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+        str = "alpha";
+        res = test_cell_insertion(col_db, 0, str);
+        assert(res);
+        std::string test;
+        col_db.get(1, test);
+        assert(test == "foo");
+    }
+
+    {
+        mtv_type col_db(3);
+        std::string str = "alpha";
+        col_db.set(2, str);
+        res = test_cell_insertion(col_db, 2, 5.0);
+        assert(res);
+
+        res = test_cell_insertion(col_db, 0, 1.0);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 2.0);
+        assert(res);
+
+        // At this point it contains one numeric block with 3 values.
+
+        str = "beta";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+        res = test_cell_insertion(col_db, 2, 3.0);
+        assert(res);
+        double test;
+        col_db.get(0, test);
+        assert(test == 1.0);
+        col_db.get(1, test);
+        assert(test == 2.0);
+        col_db.get(2, test);
+        assert(test == 3.0);
+    }
+
+    {
+        mtv_type col_db(3);
+        res = test_cell_insertion(col_db, 1, 5.0);
+        assert(res);
+        std::string str = "alpha";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+
+        res = test_cell_insertion(col_db, 0, 4.0);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 3.0);
+        assert(res);
+        double test;
+        col_db.get(0, test);
+        assert(test == 4.0);
+
+        // The top 2 cells are numeric and the bottom cell is still empty.
+
+        str = "beta";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+        col_db.get(0, test);
+        assert(test == 4.0);
+
+        res = test_cell_insertion(col_db, 1, 6.5);
+        assert(res);
+        col_db.get(0, test);
+        assert(test == 4.0);
+
+        str = "gamma";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+        col_db.get(0, test);
+        assert(test == 4.0);
+        col_db.get(1, test);
+        assert(test == 6.5);
+
+        // The top 2 cells are numeric and the bottom cell is std::string.
+
+        str = "delta";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(4);
+        col_db.set(0, 1.0);
+        std::string str = "foo";
+        col_db.set(1, str);
+        col_db.set(2, str);
+        col_db.set(3, 4.0);
+
+        res = test_cell_insertion(col_db, 2, 3.0);
+        assert(res);
+        double test;
+        col_db.get(3, test);
+        assert(test == 4.0);
+    }
+
+    {
+        mtv_type col_db(4);
+        col_db.set(0, 1.0);
+        std::string str = "foo";
+        col_db.set(1, str);
+        col_db.set(2, str);
+        col_db.set(3, str);
+
+        res = test_cell_insertion(col_db, 3, 3.0);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(4);
+        col_db.set(0, 1.0);
+        std::string str = "foo";
+        col_db.set(1, str);
+        col_db.set(2, str);
+
+        res = test_cell_insertion(col_db, 2, 3.0);
+        assert(res);
+
+        // Next cell should still be empty.
+        double test_val;
+        col_db.get(3, test_val);
+        assert(test_val == 0.0);
+        std::string test_str;
+        col_db.get(3, test_str);
+        assert(test_str.empty());
+    }
+
+    {
+        mtv_type col_db(4);
+        col_db.set(0, 1.0);
+        col_db.set(1, 1.0);
+        col_db.set(2, 1.0);
+        col_db.set(3, 1.0);
+        std::string str = "alpha";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        col_db.set(0, 1.0);
+        col_db.set(1, 1.0);
+        std::string str = "foo";
+        col_db.set(2, str);
+        uint64_t index = 5;
+        test_cell_insertion(col_db, 2, index);
+    }
+
+    {
+        mtv_type col_db(3);
+        col_db.set(1, 1.0);
+        std::string str = "foo";
+        col_db.set(2, str);
+        str = "bah";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 2.0);
+        assert(res);
+        uint64_t index = 2;
+        res = test_cell_insertion(col_db, 1, index);
+        assert(res);
+        std::string test;
+        col_db.get(2, test);
+        assert(test == "foo");
+        str = "alpha";
+        res = test_cell_insertion(col_db, 0, str);
+        assert(res);
+        double val = 3.5;
+        res = test_cell_insertion(col_db, 1, val);
+        assert(res);
+        index = 3;
+        res = test_cell_insertion(col_db, 2, index);
+        assert(res);
+
+        // At this point cells 1, 2, 3 all contain different data types.
+
+        str = "beta";
+        res = test_cell_insertion(col_db, 1, str);
+        assert(res);
+
+        // Reset.
+        val = 4.5;
+        res = test_cell_insertion(col_db, 1, val);
+        assert(res);
+
+        index = 4;
+        res = test_cell_insertion(col_db, 1, index);
+        assert(res);
+    }
+
+    {
+        mtv_type col_db(3);
+        col_db.set(0, 1.0);
+        std::string str = "alpha";
+        col_db.set(1, str);
+        str = "beta";
+        col_db.set(2, str);
+        uint64_t index = 1;
+        res = test_cell_insertion(col_db, 1, index);
+        assert(res);
+        std::string test;
+        col_db.get(2, test);
+        assert(test == "beta");
+    }
+
+    {
+        mtv_type col_db(3);
+
+        // Insert 3 cells of 3 different types.
+        res = test_cell_insertion(col_db, 0, true);
+        assert(res);
+        res = test_cell_insertion(col_db, 1, 1.2);
+        assert(res);
+        std::string str = "foo";
+        res = test_cell_insertion(col_db, 2, str);
+        assert(res);
+
+        // Now, insert a cell of the 4th type to the middle spot.
+        uint64_t index = 2;
+        res = test_cell_insertion(col_db, 1, index);
+        assert(res);
+    }
+
+    {
+        // set_cell() to merge 3 blocks.
+        mtv_type db(6);
+        db.set(0, static_cast<uint64_t>(12));
+        db.set(1, 1.0);
+        db.set(2, 2.0);
+        db.set(3, std::string("foo"));
+        db.set(4, 3.0);
+        db.set(5, 4.0);
+        assert(db.block_size() == 4);
+        assert(db.get<uint64_t>(0) == 12);
+        assert(db.get<double>(1) == 1.0);
+        assert(db.get<double>(2) == 2.0);
+        assert(db.get<std::string>(3) == "foo");
+        assert(db.get<double>(4) == 3.0);
+        assert(db.get<double>(5) == 4.0);
+
+        db.set(3, 5.0); // merge blocks.
+        assert(db.block_size() == 2);
+        assert(db.get<uint64_t>(0) == 12);
+        assert(db.get<double>(1) == 1.0);
+        assert(db.get<double>(2) == 2.0);
+        assert(db.get<double>(3) == 5.0);
+        assert(db.get<double>(4) == 3.0);
+        assert(db.get<double>(5) == 4.0);
+    }
+
+    {
+        mtv_type db(25);
+        db.set(0, 1.2);
+        db.set(5, std::string("test"));
+        db.set(1, std::string("foo"));
+        db.set(6, true);
+        assert(db.get<double>(0) == 1.2);
+        assert(db.get<std::string>(5) == "test");
+        assert(db.get<std::string>(1) == "foo");
+        assert(db.get<bool>(6) == true);
+    }
+
+    {
+        // Test various integer types.
+        mtv_type db(7);
+        db.set(0, static_cast<int64_t>(-10));
+        db.set(1, static_cast<uint64_t>(10));
+        db.set(2, static_cast<int32_t>(-10));
+        db.set(3, static_cast<uint32_t>(10));
+        db.set(4, static_cast<int16_t>(-10));
+        db.set(5, static_cast<uint16_t>(10));
+        db.set(6, true);
+        assert(db.block_size() == 7);
+        assert(db.get_type(0) == mdds::mtv::element_type_int64);
+        assert(db.get_type(1) == mdds::mtv::element_type_uint64);
+        assert(db.get_type(2) == mdds::mtv::element_type_int32);
+        assert(db.get_type(3) == mdds::mtv::element_type_uint32);
+        assert(db.get_type(4) == mdds::mtv::element_type_int16);
+        assert(db.get_type(5) == mdds::mtv::element_type_uint16);
+        assert(db.get_type(6) == mdds::mtv::element_type_boolean);
+    }
+
+    {
+        mtv_type db(10);
+        db.set(0, 1.1);
+        db.set(1, 1.2);
+        db.set(2, true);
+        db.set(3, false);
+        db.set(8, std::string("A"));
+        db.set(9, std::string("B"));
+        db.set(7, 2.1);
+        assert(db.block_size() == 5);
+        assert(db.get_type(7) == mdds::mtv::element_type_double);
+        assert(db.get<double>(7) == 2.1);
+    }
+
+    {
+        mtv_type db(8, true);
+        std::vector<double> vals(3, 1.2);
+        db.set(4, vals.begin(), vals.end());
+        db.set(3, 4.1);
+        assert(db.get<bool>(0) == true);
+        assert(db.get<bool>(1) == true);
+        assert(db.get<bool>(2) == true);
+        assert(db.get<double>(3) == 4.1);
+        assert(db.get<double>(4) == 1.2);
+        assert(db.get<double>(5) == 1.2);
+        assert(db.get<double>(6) == 1.2);
+        assert(db.get<bool>(7) == true);
+    }
+
+    {
+        mtv_type db(10, false);
+        db.set<int8_t>(0, 'a');
+        db.set<int8_t>(1, 'b');
+        db.set<int8_t>(2, 'c');
+
+        db.set<uint8_t>(3, 'd');
+        db.set<uint8_t>(4, 'e');
+        db.set<uint8_t>(5, 'f');
+
+        assert(db.block_size() == 3);
+        db.set<int8_t>(0, 'r'); // overwrite.
+        db.set<uint8_t>(5, 'z'); // overwrite
+
+        assert(db.block_size() == 3);
+        mtv_type::const_iterator it = db.begin();
+        assert(it != db.end());
+        assert(it->type == mdds::mtv::element_type_int8);
+        {
+            const int8_t* p = &mdds::mtv::int8_element_block::at(*it->data, 0);
+            assert(*p == 'r');
+            ++p;
+            assert(*p == 'b');
+            ++p;
+            assert(*p == 'c');
+        }
+
+        ++it;
+        assert(it != db.end());
+        assert(it->type == mdds::mtv::element_type_uint8);
+        {
+            const uint8_t* p = mdds::mtv::uint8_element_block::data(*it->data);
+            assert(*p == 'd');
+            ++p;
+            assert(*p == 'e');
+            ++p;
+            assert(*p == 'z');
+        }
+    }
+}
+
+/**
+ * Ensure that float and double types are treated as different types.
+ */
+void mtv_test_basic_numeric()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db;
+
+    db.push_back<double>(0.0);
+    db.push_back<double>(1.0);
+    db.push_back<double>(2.0);
+
+    assert(db.size() == 3);
+    assert(db.block_size() == 1);
+
+    db.set<float>(1, 4.0f);
+    assert(db.size() == 3);
+    assert(db.block_size() == 3);
+
+    db.set<float>(0, 3.5f);
+    assert(db.size() == 3);
+    assert(db.block_size() == 2);
+
+    db.set<float>(2, 4.5f);
+    assert(db.size() == 3);
+    assert(db.block_size() == 1);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/construction.inl b/test/multi_type_vector/default/tc/construction.inl
new file mode 100644
index 0000000..0c0a28d
--- /dev/null
+++ b/test/multi_type_vector/default/tc/construction.inl
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_construction()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    {
+        mtv_type db; // default constructor.
+        assert(db.size() == 0);
+        assert(db.empty());
+        assert(db.block_size() == 0);
+    }
+
+    {
+        // Create an empty segment of size 7.
+        mtv_type db(7);
+        assert(db.size() == 7);
+        assert(db.block_size() == 1);
+    }
+
+    {
+        // Create with initial value and size.
+        mtv_type db(10, 1.0);
+        assert(db.size() == 10);
+        assert(db.block_size() == 1);
+        assert(db.get<double>(0) == 1.0);
+        assert(db.get<double>(9) == 1.0);
+    }
+
+    {
+        // Create with initial value and size.
+        mtv_type db(10, std::string("foo"));
+        assert(db.size() == 10);
+        assert(db.block_size() == 1);
+        assert(db.get<std::string>(0) == "foo");
+        assert(db.get<std::string>(9) == "foo");
+    }
+
+    {
+        // Create with an array of values.
+        std::vector<double> vals;
+        vals.push_back(1.1);
+        vals.push_back(1.2);
+        vals.push_back(1.3);
+        mtv_type db(vals.size(), vals.begin(), vals.end());
+        assert(db.size() == 3);
+        assert(db.block_size() == 1);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<double>(1) == 1.2);
+        assert(db.get<double>(2) == 1.3);
+    }
+
+    {
+        std::vector<std::string> vals;
+        mtv_type db_empty(0, vals.begin(), vals.end());
+        assert(db_empty.size() == 0);
+        assert(db_empty.block_size() == 0);
+
+        vals.push_back("Andy");
+        vals.push_back("Bruce");
+
+        mtv_type db(2, vals.begin(), vals.end());
+        assert(db.size() == 2);
+        assert(db.block_size() == 1);
+        assert(db.get<std::string>(0) == "Andy");
+        assert(db.get<std::string>(1) == "Bruce");
+    }
+
+    {
+        std::vector<int32_t> vals(10, 1);
+        try
+        {
+            mtv_type db(20, vals.begin(), vals.end());
+            assert(!"This construction should have failed due to incorrect initial array size.");
+        }
+        catch (const mdds::invalid_arg_error&)
+        {
+            // good.
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/empty_cells.inl b/test/multi_type_vector/default/tc/empty_cells.inl
new file mode 100644
index 0000000..293f77b
--- /dev/null
+++ b/test/multi_type_vector/default/tc/empty_cells.inl
@@ -0,0 +1,449 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_empty_cells()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    {
+        mtv_type db(3);
+
+        assert(db.is_empty(0));
+        assert(db.is_empty(2));
+
+        // These won't change the state of the container since it's already empty.
+        db.set_empty(0, 0);
+        db.set_empty(1, 1);
+        db.set_empty(2, 2);
+        db.set_empty(0, 2);
+
+        db.set(0, 1.0);
+        db.set(2, 5.0);
+        assert(!db.is_empty(0));
+        assert(!db.is_empty(2));
+        assert(db.is_empty(1));
+
+        db.set(1, 2.3);
+        assert(!db.is_empty(1));
+
+        // Container contains a single block of numeric cells at this point.
+
+        // Set the whole block empty.
+        db.set_empty(0, 2);
+
+        // Reset.
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        db.set(2, 4.0);
+
+        // Set the upper part of the block empty.
+        db.set_empty(0, 1);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+
+        double test;
+        db.get(2, test);
+        assert(test == 4.0);
+
+        // Reset.
+        db.set(0, 5.0);
+        db.set(1, 5.1);
+        db.set(2, 5.2);
+
+        // Set the lower part of the block empty.
+        db.set_empty(1, 2);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+
+        db.get(0, test);
+        assert(test == 5.0);
+
+        // Reset.
+        db.set(0, 3.0);
+        db.set(1, 3.1);
+        db.set(2, 3.2);
+
+        // Set the middle part of the block empty.
+        db.set_empty(1, 1);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+        db.get(0, test);
+        assert(test == 3.0);
+        db.get(2, test);
+        assert(test == 3.2);
+
+        bool res = test_cell_insertion(db, 1, 4.3);
+        assert(res);
+    }
+
+    {
+        // Empty multiple cells at the middle part of a block.
+        mtv_type db(4);
+        for (size_t i = 0; i < 4; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        for (size_t i = 0; i < 4; ++i)
+        {
+            assert(!db.is_empty(i));
+        }
+
+        db.set_empty(1, 2);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(!db.is_empty(3));
+
+        double test;
+        db.get(0, test);
+        assert(test == 1.0);
+        db.get(3, test);
+        assert(test == 4.0);
+    }
+
+    {
+        // Empty multiple blocks.
+        mtv_type db(2);
+        db.set(0, 1.0);
+        db.set(1, std::string("foo"));
+        assert(!db.is_empty(0));
+        assert(!db.is_empty(1));
+
+        db.set_empty(0, 1);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+    }
+
+    {
+        // Empty multiple blocks, part 2 - from middle block to middle block.
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        std::string str = "foo";
+        db.set(2, str);
+        db.set(3, str);
+        uint64_t index = 1;
+        db.set(4, index);
+        index = 100;
+        db.set(5, index);
+
+        db.set_empty(1, 4);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(!db.is_empty(5));
+        double val;
+        db.get(0, val);
+        assert(val == 1.0);
+        uint64_t index_test;
+        db.get(5, index_test);
+        assert(index_test == 100);
+    }
+
+    {
+        // Empty multiple blocks, part 3 - from top block to middle block.
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        std::string str = "foo";
+        db.set(2, str);
+        db.set(3, str);
+        uint64_t index = 1;
+        db.set(4, index);
+        index = 50;
+        db.set(5, index);
+
+        db.set_empty(0, 4);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(!db.is_empty(5));
+        uint64_t test;
+        db.get(5, test);
+        assert(test == 50);
+    }
+
+    {
+        // Empty multiple blocks, part 4 - from middle block to bottom block.
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        std::string str = "foo";
+        db.set(2, str);
+        db.set(3, str);
+        uint64_t index = 1;
+        db.set(4, index);
+        db.set(5, index);
+
+        db.set_empty(1, 5);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.is_empty(5));
+        double test;
+        db.get(0, test);
+        assert(test == 1.0);
+    }
+
+    {
+        // Empty multiple blocks, part 5 - from middle empty block to middle non-empty block.
+        mtv_type db(6);
+        db.set(2, 1.0);
+        db.set(3, 2.0);
+        std::string str = "foo";
+        db.set(4, str);
+        str = "baa";
+        db.set(5, str);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+        assert(!db.is_empty(3));
+        assert(!db.is_empty(4));
+        assert(!db.is_empty(5));
+        assert(db.block_size() == 3);
+
+        db.set_empty(1, 4);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(!db.is_empty(5));
+        assert(db.block_size() == 2);
+        std::string test;
+        db.get(5, test);
+        assert(test == "baa");
+    }
+
+    {
+        // Empty multiple blocks, part 6 - from middle non-empty block to middle empty block.
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        db.set(2, std::string("foo"));
+        db.set(3, std::string("baa"));
+        assert(!db.is_empty(0));
+        assert(!db.is_empty(1));
+        assert(!db.is_empty(2));
+        assert(!db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.is_empty(5));
+
+        db.set_empty(1, 4);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.is_empty(5));
+        double test;
+        db.get(0, test);
+        assert(test == 1.0);
+        assert(db.block_size() == 2);
+    }
+
+    {
+        // Empty multiple blocks, part 7 - from middle empty block to middle empty block.
+        mtv_type db(6);
+        db.set(2, 1.0);
+        db.set(3, std::string("foo"));
+        assert(db.block_size() == 4);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+        assert(!db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.is_empty(5));
+
+        // This should set the whole range empty.
+        db.set_empty(1, 4);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.is_empty(5));
+        assert(db.block_size() == 1);
+    }
+
+    {
+        // Set empty on 2nd block.  Presence of first block causes an offset
+        // on index in the 2nd block.
+        mtv_type db(5);
+        db.set(0, 1.0);
+        db.set(1, static_cast<uint64_t>(1));
+        db.set(2, static_cast<uint64_t>(2));
+        db.set(3, static_cast<uint64_t>(3));
+        db.set(4, static_cast<uint64_t>(4));
+
+        db.set_empty(2, 4);
+        assert(!db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+
+        db.set(2, static_cast<uint64_t>(5));
+        db.set(3, static_cast<uint64_t>(6));
+        db.set(4, static_cast<uint64_t>(7));
+        db.set_empty(1, 2);
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(!db.is_empty(3));
+        assert(!db.is_empty(4));
+
+        db.set(3, static_cast<uint64_t>(8));
+        db.set(4, static_cast<uint64_t>(9));
+        db.set_empty(2, 3);
+    }
+
+    {
+        // Set individual single elements empty.
+        cout << "Setting individual single elements empty..." << endl;
+        mtv_type db(15, 1.2);
+        cout << "setting 1 empty..." << endl;
+        db.set_empty(1, 1);
+        cout << "setting 4 empty..." << endl;
+        db.set_empty(4, 4);
+        cout << "setting 7 empty..." << endl;
+        db.set_empty(7, 7);
+        cout << "setting 10 empty..." << endl;
+        db.set_empty(10, 10);
+        cout << "setting 12 empty..." << endl;
+        db.set_empty(12, 12);
+        assert(!db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+        assert(!db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(!db.is_empty(5));
+        assert(!db.is_empty(6));
+        assert(db.is_empty(7));
+        assert(!db.is_empty(8));
+        assert(!db.is_empty(9));
+        assert(db.is_empty(10));
+        assert(!db.is_empty(11));
+        assert(db.is_empty(12));
+        assert(!db.is_empty(13));
+        assert(!db.is_empty(14));
+    }
+
+    {
+        mtv_type db(3, true);
+        assert(db.block_size() == 1);
+        db.set_empty(1, 1);
+        assert(db.get<bool>(0) == true);
+        assert(db.is_empty(1));
+        assert(db.get<bool>(2) == true);
+        assert(db.block_size() == 3);
+    }
+
+    {
+        mtv_type db(10);
+        assert(db.block_size() == 1);
+
+        int16_t val = 12;
+        db.set(3, val);
+        assert(db.block_size() == 3);
+        assert(db.is_empty(2));
+        assert(!db.is_empty(3));
+        assert(db.is_empty(4));
+
+        db.set_empty(3, 3); // This should merge the top, middle and bottom blocks into one.
+        assert(db.block_size() == 1);
+
+        db.set(9, val);
+        assert(db.block_size() == 2);
+        db.set_empty(9, 9); // Merge the block with the top one.
+        assert(db.block_size() == 1);
+
+        db = mtv_type(10, true);
+        db.set(3, 1.1);
+        db.set(4, 1.2);
+        db.set(5, 1.3);
+        assert(db.block_size() == 3);
+        db.set_empty(3, 5); // No merging.
+        assert(db.block_size() == 3);
+    }
+
+    {
+        mtv_type db(10);
+        db.set(0, 1.1);
+        assert(db.block_size() == 2);
+        db.set(1, 1.2);
+        assert(db.block_size() == 2);
+        db.set_empty(1, 1); // Merge with the next block.
+        assert(db.block_size() == 2);
+        db.set(1, 1.3);
+
+        db = mtv_type(5);
+        db.set(3, 2.1);
+        db.set(4, 2.2);
+        assert(db.block_size() == 2);
+        db.set_empty(3, 3); // Merge with the previous block.
+        assert(db.block_size() == 2);
+    }
+
+    {
+        mtv_type db(7);
+        db.set(0, 1.2);
+        db.set(2, true);
+        db.set(4, true);
+        db.set(5, static_cast<int32_t>(22));
+        db.set(6, std::string("foo"));
+        assert(db.block_size() == 7);
+        db.set_empty(2, 4); // Merge with the previous block.
+        assert(db.block_size() == 4);
+        assert(db.get<double>(0) == 1.2);
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.is_empty(4));
+        assert(db.get<int32_t>(5) == 22);
+        assert(db.get<std::string>(6) == "foo");
+    }
+
+    {
+        mtv_type db(4);
+        db.set(0, true);
+        db.set(2, true);
+        assert(db.block_size() == 4);
+        db.set_empty(0, 2); // Merge with the next block.
+        cout << "block size: " << db.block_size() << endl;
+        assert(db.block_size() == 1);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/erase.inl b/test/multi_type_vector/default/tc/erase.inl
new file mode 100644
index 0000000..15828c3
--- /dev/null
+++ b/test/multi_type_vector/default/tc/erase.inl
@@ -0,0 +1,360 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_erase()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        // Single empty block.
+        mtv_type db(5);
+        db.erase(0, 2); // erase rows 0-2.
+        assert(db.size() == 2);
+        db.erase(0, 1);
+        assert(db.size() == 0);
+        assert(db.empty());
+    }
+
+    {
+        // Single empty block followed by a non-empty block.
+        mtv_type db(5);
+        db.push_back<int32_t>(-234);
+
+        db.erase(0, 2); // erase rows 0-2.
+        assert(db.size() == 3);
+        db.erase(0, 1);
+        assert(db.size() == 1);
+    }
+
+    {
+        // Single non-empty block.
+        mtv_type db(5);
+        for (long i = 0; i < 5; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        assert(db.block_size() == 1);
+        assert(db.size() == 5);
+
+        db.erase(0, 2); // erase rows 0-2
+        assert(db.size() == 2);
+        double test;
+        db.get(0, test);
+        assert(test == 4.0);
+        db.get(1, test);
+        assert(test == 5.0);
+
+        db.erase(0, 1);
+        assert(db.size() == 0);
+        assert(db.empty());
+    }
+
+    {
+        // Two blocks - non-empty to empty blocks.
+        mtv_type db(8);
+        for (long i = 0; i < 4; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        assert(db.block_size() == 2);
+        assert(db.size() == 8);
+        assert(!db.is_empty(3));
+        assert(db.is_empty(4));
+
+        // Erase across two blocks.
+        db.erase(3, 6); // 4 cells
+        assert(db.block_size() == 2);
+        assert(db.size() == 4);
+
+        // Check the integrity of the data.
+        double test;
+        db.get(2, test);
+        assert(test == 3.0);
+        assert(db.is_empty(3));
+
+        // Empty it.
+        db.erase(0, 3);
+        assert(db.block_size() == 0);
+        assert(db.size() == 0);
+        assert(db.empty());
+    }
+
+    {
+        // Two blocks - non-empty to non-empty blocks.
+        mtv_type db(8);
+        for (long i = 0; i < 4; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        for (long i = 4; i < 8; ++i)
+            db.set(i, static_cast<uint64_t>(i + 1));
+
+        assert(db.block_size() == 2);
+        assert(db.size() == 8);
+
+        // Erase across two blocks.
+        db.erase(3, 6); // 4 cells
+        assert(db.block_size() == 2);
+        assert(db.size() == 4);
+
+        // Check the integrity of the data.
+        double test;
+        db.get(2, test);
+        assert(test == 3.0);
+
+        uint64_t test2;
+        db.get(3, test2);
+        assert(test2 == 8);
+
+        // Empty it.
+        db.erase(0, 3);
+        assert(db.block_size() == 0);
+        assert(db.size() == 0);
+        assert(db.empty());
+    }
+
+    {
+        // 3 blocks, all non-empty.
+        mtv_type db(9);
+        for (long i = 0; i < 3; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        for (long i = 3; i < 6; ++i)
+            db.set(i, static_cast<uint64_t>(i + 1));
+
+        for (long i = 6; i < 9; ++i)
+        {
+            std::ostringstream os;
+            os << i + 1;
+            db.set(i, os.str());
+        }
+
+        assert(db.block_size() == 3);
+        assert(db.size() == 9);
+
+        db.erase(2, 7);
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+
+        // Check the integrity of the data.
+        double test1;
+        db.get(1, test1);
+        assert(test1 == 2.0);
+        std::string test2;
+        db.get(2, test2);
+        assert(test2 == "9");
+
+        db.erase(2, 2); // Erase only one-block.
+        assert(db.block_size() == 1);
+        assert(db.size() == 2);
+        test1 = -1.0;
+        db.get(1, test1);
+        assert(test1 == 2.0);
+
+        db.erase(0, 1);
+        assert(db.size() == 0);
+        assert(db.empty());
+    }
+
+    {
+        // erase() to merge two blocks.
+        mtv_type db(4);
+        db.set(0, 1.1);
+        db.set(1, std::string("foo"));
+        db.set(2, static_cast<uint64_t>(2));
+        db.set(3, std::string("baa"));
+        assert(db.block_size() == 4);
+        assert(db.size() == 4);
+
+        db.erase(2, 2);
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+
+        // Try again, but this time merge two empty blocks.
+        db.resize(4);
+        db.set_empty(1, 3);
+        db.set(2, static_cast<uint64_t>(10));
+        assert(db.get<double>(0) == 1.1);
+        assert(db.is_empty(1));
+        assert(db.get<uint64_t>(2) == 10);
+        assert(db.is_empty(3));
+
+        db.erase(2, 2);
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+    }
+
+    {
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set(1, 2.0);
+        db.set(2, std::string("A"));
+        db.set(3, std::string("B"));
+        db.set(4, 5.0);
+        db.set(5, 6.0);
+        assert(db.block_size() == 3);
+        assert(db.size() == 6);
+        assert(db.get<double>(0) == 1.0);
+        assert(db.get<double>(1) == 2.0);
+        assert(db.get<std::string>(2) == "A");
+        assert(db.get<std::string>(3) == "B");
+        assert(db.get<double>(4) == 5.0);
+        assert(db.get<double>(5) == 6.0);
+        db.erase(1, 4);
+        assert(db.block_size() == 1);
+        assert(db.size() == 2);
+        assert(db.get<double>(0) == 1.0);
+        assert(db.get<double>(1) == 6.0);
+    }
+
+    {
+        mtv_type db(6);
+        db.set(0, 1.0);
+        db.set<int8_t>(4, 2);
+        db.set<int16_t>(5, 3);
+        db.erase(1, 3);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(1.0);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(3);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int32_t>(9);
+
+        db.erase(1, 3);
+        assert(db.block_size() == 3);
+        assert(db.size() == 6);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(1.0);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(3);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(9);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int32_t>(9);
+
+        db.erase(1, 5);
+        assert(db.block_size() == 2);
+        assert(db.size() == 7);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(1.0);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(3);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(9);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int32_t>(9);
+
+        db.erase(3, 5);
+        assert(db.block_size() == 2);
+        assert(db.size() == 9);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(1.0);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(3);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back_empty();
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int32_t>(9);
+
+        db.erase(3, 5);
+        assert(db.block_size() == 3);
+        assert(db.size() == 9);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back_empty();
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(3);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(1.23);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int32_t>(9);
+
+        db.erase(3, 5);
+        assert(db.block_size() == 3);
+        assert(db.size() == 9);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back_empty();
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(3);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back_empty();
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int32_t>(9);
+
+        db.erase(3, 5);
+        assert(db.block_size() == 2);
+        assert(db.size() == 9);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/hints.inl b/test/multi_type_vector/default/tc/hints.inl
new file mode 100644
index 0000000..5cf4b10
--- /dev/null
+++ b/test/multi_type_vector/default/tc/hints.inl
@@ -0,0 +1,186 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_hints_set()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(3);
+    db.set(db.begin(), 0, 23.4);
+    assert(db.get<double>(0) == 23.4);
+    db.set(db.end(), 0, std::string("test")); // passing end position should have no impact.
+    assert(db.get<std::string>(0) == "test");
+
+    mtv_type::iterator pos_hint = db.set(0, 1.2);
+    pos_hint = db.set(pos_hint, 1, 1.3);
+    pos_hint = db.set(pos_hint, 2, 1.4);
+    assert(db.get<double>(0) == 1.2);
+    assert(db.get<double>(1) == 1.3);
+    assert(db.get<double>(2) == 1.4);
+
+    pos_hint = db.begin();
+    pos_hint = db.set(pos_hint, 0, false);
+    pos_hint = db.set(pos_hint, 1, std::string("foo"));
+    pos_hint = db.set(pos_hint, 2, 34.5);
+    assert(db.get<bool>(0) == false);
+    assert(db.get<std::string>(1) == "foo");
+    assert(db.get<double>(2) == 34.5);
+
+    db.set(pos_hint, 0, int32_t(444)); // position hint does not precede the insertion position.
+    assert(db.get<int32_t>(0) == 444); // it should still work.
+}
+
+void mtv_test_hints_set_cells()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(9);
+
+    std::vector<int32_t> ints;
+    ints.push_back(1);
+    ints.push_back(2);
+    ints.push_back(3);
+
+    std::vector<double> doubles;
+    doubles.push_back(1.1);
+    doubles.push_back(1.2);
+    doubles.push_back(1.3);
+
+    std::vector<std::string> strings;
+    strings.push_back(std::string("A"));
+    strings.push_back(std::string("B"));
+    strings.push_back(std::string("C"));
+
+    mtv_type::iterator pos_hint = db.begin();
+    pos_hint = db.set(pos_hint, 0, ints.begin(), ints.end());
+    pos_hint = db.set(pos_hint, 3, doubles.begin(), doubles.end());
+    pos_hint = db.set(pos_hint, 6, strings.begin(), strings.end());
+
+    assert(db.get<int32_t>(0) == 1);
+    assert(db.get<int32_t>(1) == 2);
+    assert(db.get<int32_t>(2) == 3);
+
+    assert(db.get<double>(3) == 1.1);
+    assert(db.get<double>(4) == 1.2);
+    assert(db.get<double>(5) == 1.3);
+
+    assert(db.get<std::string>(6) == "A");
+    assert(db.get<std::string>(7) == "B");
+    assert(db.get<std::string>(8) == "C");
+}
+
+void mtv_test_hints_insert_cells()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db(1, true); // We need to have at least one element to be able to insert.
+
+    std::vector<int32_t> ints;
+    ints.push_back(11);
+    ints.push_back(22);
+
+    std::vector<double> doubles;
+    doubles.push_back(2.1);
+    doubles.push_back(3.2);
+    doubles.push_back(4.3);
+
+    std::vector<std::string> strings;
+    strings.push_back(std::string("Andy"));
+    strings.push_back(std::string("Bruce"));
+    strings.push_back(std::string("Charlie"));
+    strings.push_back(std::string("David"));
+
+    mtv_type::iterator pos_hint = db.insert(0, ints.begin(), ints.end());
+    assert(db.get<int32_t>(0) == 11);
+    assert(db.get<int32_t>(1) == 22);
+    assert(db.get<bool>(2) == true);
+
+    pos_hint = db.insert(pos_hint, 2, doubles.begin(), doubles.end());
+    assert(db.get<int32_t>(0) == 11);
+    assert(db.get<int32_t>(1) == 22);
+    assert(db.get<double>(2) == 2.1);
+    assert(db.get<double>(3) == 3.2);
+    assert(db.get<double>(4) == 4.3);
+    assert(db.get<bool>(5) == true);
+
+    pos_hint = db.insert(pos_hint, 4, strings.begin(), strings.end());
+    assert(db.get<int32_t>(0) == 11);
+    assert(db.get<int32_t>(1) == 22);
+    assert(db.get<double>(2) == 2.1);
+    assert(db.get<double>(3) == 3.2);
+    assert(db.get<std::string>(4) == "Andy");
+    assert(db.get<std::string>(5) == "Bruce");
+    assert(db.get<std::string>(6) == "Charlie");
+    assert(db.get<std::string>(7) == "David");
+    assert(db.get<double>(8) == 4.3);
+    assert(db.get<bool>(9) == true);
+}
+
+void mtv_test_hints_set_empty()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(20, true);
+    mtv_type::iterator pos_hint = db.set_empty(db.begin(), 2, 3);
+    pos_hint = db.set_empty(pos_hint, 5, 7);
+    pos_hint = db.set_empty(pos_hint, 9, 12);
+    pos_hint = db.set_empty(pos_hint, 14, 17);
+
+    // Check the boundaries.
+    assert(!db.is_empty(0));
+    assert(!db.is_empty(4));
+    assert(db.is_empty(5));
+    assert(db.is_empty(7));
+    assert(!db.is_empty(8));
+    assert(db.is_empty(9));
+    assert(db.is_empty(12));
+    assert(!db.is_empty(13));
+    assert(db.is_empty(14));
+    assert(db.is_empty(17));
+    assert(!db.is_empty(18));
+}
+
+void mtv_test_hints_insert_empty()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(2, true);
+    mtv_type::iterator pos_hint = db.begin();
+    pos_hint = db.insert_empty(pos_hint, 1, 3); // the size becomes 5.
+    pos_hint = db.insert_empty(pos_hint, 4, 2); // the size now becomes 7.
+
+    mtv_type::iterator check = db.begin();
+    assert(check->type == mdds::mtv::element_type_boolean);
+    assert(check->size == 1);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(check->size == 5);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_boolean);
+    assert(check->size == 1);
+    ++check;
+    assert(check == db.end());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/insert.inl b/test/multi_type_vector/default/tc/insert.inl
new file mode 100644
index 0000000..eb632fe
--- /dev/null
+++ b/test/multi_type_vector/default/tc/insert.inl
@@ -0,0 +1,375 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_insert_empty()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        mtv_type db(5);
+        db.insert_empty(0, 5);
+        assert(db.size() == 10);
+        assert(db.block_size() == 1);
+
+        // Insert data from row 0 to 4.
+        for (long i = 0; i < 5; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        assert(db.block_size() == 2);
+        assert(db.size() == 10);
+
+        // Now, insert an empty block of size 2 at the top.
+        db.insert_empty(0, 2);
+        assert(db.block_size() == 3);
+        assert(db.size() == 12);
+
+        double test;
+        db.get(2, test);
+        assert(test == 1.0);
+
+        // Insert an empty cell into an empty block.  This should shift the
+        // data block down by one.
+        db.insert_empty(1, 1);
+        assert(db.block_size() == 3);
+        assert(db.size() == 13);
+        db.get(4, test);
+        assert(test == 2.0);
+    }
+
+    {
+        mtv_type db(5);
+        for (long i = 0; i < 5; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        assert(db.block_size() == 1);
+        assert(db.size() == 5);
+
+        // Insert an empty block into the middle of a non-empty block.
+        db.insert_empty(2, 2);
+
+        assert(db.block_size() == 3);
+        assert(db.size() == 7);
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+
+        double test;
+        db.get(0, test);
+        assert(test == 1.0);
+        db.get(1, test);
+        assert(test == 2.0);
+
+        db.get(4, test);
+        assert(test == 3.0);
+        db.get(5, test);
+        assert(test == 4.0);
+        db.get(6, test);
+        assert(test == 5.0);
+    }
+
+    {
+        mtv_type db(1);
+        db.set(0, 2.5);
+        db.insert_empty(0, 2);
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+        assert(db.is_empty(1));
+        assert(!db.is_empty(2));
+
+        double test;
+        db.get(2, test);
+        assert(test == 2.5);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, 1.2);
+        db.set(1, 2.3);
+        db.insert_empty(1, 1);
+
+        assert(db.block_size() == 3);
+        assert(db.size() == 3);
+        double test;
+        db.get(0, test);
+        assert(test == 1.2);
+        db.get(2, test);
+        assert(test == 2.3);
+    }
+
+    {
+        mtv_type db(2);
+        db.push_back<double>(12.0);
+        db.push_back<float>(13.0);
+        db.insert_empty(2, 2);
+
+        assert(db.block_size() == 3);
+        assert(db.size() == 6);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.is_empty(2));
+        assert(db.is_empty(3));
+        assert(db.get<double>(4) == 12.0);
+        assert(db.get<float>(5) == 13.0);
+    }
+
+    {
+        mtv_type db;
+        for (int32_t i = 0; i < 9; ++i)
+            db.push_back(i);
+
+        db.push_back<int16_t>(123);
+        db.insert_empty(7, 3);
+
+        assert(db.block_size() == 4);
+        assert(db.size() == 13);
+    }
+}
+
+void mtv_test_insert_cells()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        // Insert into non-empty block of the same type.
+        mtv_type db(1);
+        db.set(0, 1.1);
+        assert(db.block_size() == 1);
+        assert(db.size() == 1);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(0, p, p + 3);
+        assert(db.block_size() == 1);
+        assert(db.size() == 4);
+        assert(db.get<double>(0) == 2.1);
+        assert(db.get<double>(1) == 2.2);
+        assert(db.get<double>(2) == 2.3);
+        assert(db.get<double>(3) == 1.1);
+    }
+
+    {
+        // Insert into an existing empty block.
+        mtv_type db(1);
+        assert(db.block_size() == 1);
+        assert(db.size() == 1);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(0, p, p + 3);
+        assert(db.block_size() == 2);
+        assert(db.size() == 4);
+        assert(db.get<double>(0) == 2.1);
+        assert(db.get<double>(1) == 2.2);
+        assert(db.get<double>(2) == 2.3);
+        assert(db.is_empty(3));
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, 1.1);
+        assert(db.block_size() == 2);
+        assert(db.size() == 2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 2);
+        assert(db.size() == 5);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.is_empty(4));
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, static_cast<uint64_t>(23));
+        assert(db.block_size() == 2);
+        assert(db.size() == 2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 3);
+        assert(db.size() == 5);
+        assert(db.get<uint64_t>(0) == 23);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.is_empty(4));
+    }
+
+    {
+        mtv_type db(2);
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 3);
+        assert(db.size() == 5);
+        assert(db.is_empty(0));
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.is_empty(4));
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, 1.1);
+        db.set(1, static_cast<uint64_t>(23));
+        assert(db.block_size() == 2);
+        assert(db.size() == 2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 2);
+        assert(db.size() == 5);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.get<uint64_t>(4) == 23);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, true);
+        db.set(1, static_cast<uint64_t>(23));
+        assert(db.block_size() == 2);
+        assert(db.size() == 2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 3);
+        assert(db.size() == 5);
+        assert(db.get<bool>(0) == true);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.get<uint64_t>(4) == 23);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, static_cast<uint64_t>(12));
+        db.set(1, static_cast<uint64_t>(23));
+        assert(db.block_size() == 1);
+        assert(db.size() == 2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 3);
+        assert(db.size() == 5);
+        assert(db.get<uint64_t>(0) == 12);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.get<uint64_t>(4) == 23);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, 1.0);
+        db.set(1, std::string("foo"));
+        db.set(2, std::string("baa"));
+        assert(db.size() == 3);
+        assert(db.block_size() == 2);
+        double vals[] = {2.1};
+        const double* p = &vals[0];
+        db.insert(2, p, p + 1);
+        assert(db.size() == 4);
+        assert(db.block_size() == 4);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, static_cast<uint64_t>(11));
+        db.set(1, static_cast<uint64_t>(12));
+        double vals[] = {1.2};
+        const double* p = &vals[0];
+        db.insert(1, p, p + 1);
+        assert(db.block_size() == 3);
+
+        // Append value to the top block.
+        uint64_t vals2[] = {22};
+        const uint64_t* p2 = &vals2[0];
+        db.insert(1, p2, p2 + 1);
+        assert(db.block_size() == 3);
+        assert(db.get<uint64_t>(0) == 11);
+        assert(db.get<uint64_t>(1) == 22);
+        assert(db.get<double>(2) == 1.2);
+        assert(db.get<uint64_t>(3) == 12);
+    }
+
+    {
+        mtv_type db(5);
+        db.push_back<double>(1.1);
+        db.push_back<double>(1.2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        const double* p = vals;
+        db.insert(2, p, p + 3);
+        assert(db.block_size() == 4);
+        assert(db.size() == 10);
+        assert(db.is_empty(0));
+        assert(db.is_empty(1));
+        assert(db.get<double>(2) == 2.1);
+        assert(db.get<double>(3) == 2.2);
+        assert(db.get<double>(4) == 2.3);
+        assert(db.is_empty(5));
+        assert(db.is_empty(6));
+        assert(db.is_empty(7));
+        assert(db.get<double>(8) == 1.1);
+        assert(db.get<double>(9) == 1.2);
+    }
+
+    {
+        mtv_type db(5, int16_t(222));
+        db.push_back<int32_t>(12);
+        db.push_back<int32_t>(34);
+
+        int16_t vals[] = {5, 6, 7};
+        const int16_t* p = vals;
+        db.insert(1, p, p + 3);
+        assert(db.block_size() == 2);
+        assert(db.size() == 10);
+        assert(db.get<int16_t>(0) == 222);
+        assert(db.get<int16_t>(1) == 5);
+        assert(db.get<int16_t>(2) == 6);
+        assert(db.get<int16_t>(3) == 7);
+        assert(db.get<int16_t>(4) == 222);
+        assert(db.get<int16_t>(5) == 222);
+        assert(db.get<int16_t>(6) == 222);
+        assert(db.get<int16_t>(7) == 222);
+        assert(db.get<int32_t>(8) == 12);
+        assert(db.get<int32_t>(9) == 34);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/iterators.inl b/test/multi_type_vector/default/tc/iterators.inl
new file mode 100644
index 0000000..3418e8f
--- /dev/null
+++ b/test/multi_type_vector/default/tc/iterators.inl
@@ -0,0 +1,363 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_iterators()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        mtv_type db(5);
+        mtv_type::const_iterator it;
+        it = db.begin();
+        mtv_type::const_iterator it_end = db.end();
+        size_t len = std::distance(it, it_end);
+        assert(len == 1);
+        assert(it != it_end);
+        assert(it->type == mdds::mtv::element_type_empty);
+        assert(it->size == 5);
+        const mtv_type::const_iterator::value_type& val = *it;
+        assert(val.type == it->type);
+        assert(val.size == it->size);
+
+        ++it;
+        assert(it == it_end);
+    }
+
+    {
+        mtv_type db(6);
+        db.set(0, 1.1);
+        db.set(1, 2.2);
+        db.set(4, std::string("boo"));
+        db.set(5, std::string("hoo"));
+        assert(db.block_size() == 3);
+        {
+            // Forward iterator
+            mtv_type::const_iterator it = db.begin(), it_end = db.end();
+            size_t len = std::distance(it, it_end);
+            assert(len == 3);
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_double);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_empty);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_string);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it == it_end);
+        }
+
+        {
+            // Reverse iterator
+            mtv_type::const_reverse_iterator it = db.rbegin(), it_end = db.rend();
+            size_t len = std::distance(it, it_end);
+            assert(len == 3);
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_string);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_empty);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_double);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it == it_end);
+        }
+
+        {
+            // Reverse iterator (C++11)
+            mtv_type::const_reverse_iterator it = db.crbegin(), it_end = db.crend();
+            size_t len = std::distance(it, it_end);
+            assert(len == 3);
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_string);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_empty);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it != it_end);
+            assert(it->type == mdds::mtv::element_type_double);
+            assert(it->size == 2);
+
+            ++it;
+            assert(it == it_end);
+        }
+    }
+
+    {
+        // Make sure that decrementing the iterator calculates the position correctly.
+        mtv_type db(10);
+        db.set(0, true);
+        mtv_type::const_iterator it = db.begin();
+        assert(it->position == 0);
+        assert(it->size == 1);
+        ++it;
+        assert(it->position == 1);
+        assert(it->size == 9);
+        --it;
+        assert(it->position == 0);
+        assert(it->size == 1);
+        assert(it == db.begin());
+    }
+}
+
+void mtv_test_iterators_element_block()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db(10);
+    db.set(0, 1.1);
+    db.set(1, 1.2);
+    db.set(2, 1.3);
+    db.set(4, std::string("A"));
+    db.set(5, std::string("B"));
+    db.set(6, std::string("C"));
+    db.set(7, std::string("D"));
+    mtv_type::const_iterator it_blk = db.begin(), it_blk_end = db.end();
+
+    // First block is a numeric block.
+    assert(it_blk != it_blk_end);
+    assert(it_blk->type == mdds::mtv::element_type_double);
+    assert(it_blk->size == 3);
+    assert(it_blk->data);
+    {
+        mdds::mtv::double_element_block::const_iterator it_data = mdds::mtv::double_element_block::begin(*it_blk->data);
+        mdds::mtv::double_element_block::const_iterator it_data_end =
+            mdds::mtv::double_element_block::end(*it_blk->data);
+        assert(it_data != it_data_end);
+        assert(*it_data == 1.1);
+        ++it_data;
+        assert(*it_data == 1.2);
+        ++it_data;
+        assert(*it_data == 1.3);
+        ++it_data;
+        assert(it_data == it_data_end);
+
+        assert(mdds::mtv::double_element_block::at(*it_blk->data, 0) == 1.1);
+        assert(mdds::mtv::double_element_block::at(*it_blk->data, 1) == 1.2);
+        assert(mdds::mtv::double_element_block::at(*it_blk->data, 2) == 1.3);
+
+        // Access the underlying data array directly.
+        const double* array = &mdds::mtv::double_element_block::at(*it_blk->data, 0);
+        assert(*array == 1.1);
+        ++array;
+        assert(*array == 1.2);
+        ++array;
+        assert(*array == 1.3);
+    }
+
+    // Next block is empty.
+    ++it_blk;
+    assert(it_blk->type == mdds::mtv::element_type_empty);
+    assert(it_blk->size == 1);
+    assert(it_blk->data == nullptr);
+
+    // Next block is a string block.
+    ++it_blk;
+    assert(it_blk->type == mdds::mtv::element_type_string);
+    assert(it_blk->size == 4);
+    assert(it_blk->data);
+    {
+        mdds::mtv::string_element_block::const_reverse_iterator it_data =
+            mdds::mtv::string_element_block::rbegin(*it_blk->data);
+        mdds::mtv::string_element_block::const_reverse_iterator it_data_end =
+            mdds::mtv::string_element_block::rend(*it_blk->data);
+        assert(it_data != it_data_end);
+        assert(*it_data == "D");
+        ++it_data;
+        assert(*it_data == "C");
+        ++it_data;
+        assert(*it_data == "B");
+        ++it_data;
+        assert(*it_data == "A");
+        ++it_data;
+        assert(it_data == it_data_end);
+    }
+
+    {
+        // Test crbegin() and crend() too, which should be identical to the
+        // const variants of rbegin() and rend() from above.
+        mdds::mtv::string_element_block::const_reverse_iterator it_data =
+            mdds::mtv::string_element_block::crbegin(*it_blk->data);
+        mdds::mtv::string_element_block::const_reverse_iterator it_data_end =
+            mdds::mtv::string_element_block::crend(*it_blk->data);
+        assert(it_data != it_data_end);
+        assert(*it_data == "D");
+        ++it_data;
+        assert(*it_data == "C");
+        ++it_data;
+        assert(*it_data == "B");
+        ++it_data;
+        assert(*it_data == "A");
+        ++it_data;
+        assert(it_data == it_data_end);
+    }
+
+    // Another empty block follows.
+    ++it_blk;
+    assert(it_blk->type == mdds::mtv::element_type_empty);
+    assert(it_blk->size == 2);
+    assert(it_blk->data == nullptr);
+
+    ++it_blk;
+    assert(it_blk == it_blk_end);
+}
+
+void mtv_test_iterators_mutable_element_block()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    /**
+     * This function is just to ensure that even the non-const iterator can be
+     * dereferenced via const reference.
+     *
+     * @param it this is passed as a const reference, yet it should still allow
+     *           being dereferenced as long as no data is modified.
+     */
+    auto check_block_iterator = [](const mtv_type::iterator& it, mdds::mtv::element_t expected) {
+        mdds::mtv::element_t actual = it->type;
+        const mtv_type::element_block_type* data = (*it).data;
+        assert(actual == expected);
+        assert(data != nullptr);
+    };
+
+    mtv_type db(1);
+    db.set(0, 1.2);
+    mtv_type::iterator it_blk = db.begin(), it_blk_end = db.end();
+    size_t n = std::distance(it_blk, it_blk_end);
+    assert(n == 1);
+    check_block_iterator(it_blk, mdds::mtv::element_type_double);
+
+    mdds::mtv::double_element_block::iterator it = mdds::mtv::double_element_block::begin(*it_blk->data);
+    mdds::mtv::double_element_block::iterator it_end = mdds::mtv::double_element_block::end(*it_blk->data);
+    n = std::distance(it, it_end);
+    assert(n == 1);
+    assert(*it == 1.2);
+
+    *it = 2.3; // write via iterator.
+    assert(db.get<double>(0) == 2.3);
+
+    db.resize(3);
+    db.set(1, 2.4);
+    db.set(2, 2.5);
+
+    it_blk = db.begin();
+    it_blk_end = db.end();
+    n = std::distance(it_blk, it_blk_end);
+    assert(n == 1);
+    check_block_iterator(it_blk, mdds::mtv::element_type_double);
+
+    it = mdds::mtv::double_element_block::begin(*it_blk->data);
+    it_end = mdds::mtv::double_element_block::end(*it_blk->data);
+    n = std::distance(it, it_end);
+    assert(n == 3);
+    *it = 3.1;
+    ++it;
+    *it = 3.2;
+    ++it;
+    *it = 3.3;
+
+    assert(db.get<double>(0) == 3.1);
+    assert(db.get<double>(1) == 3.2);
+    assert(db.get<double>(2) == 3.3);
+}
+
+void mtv_test_iterators_private_data()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // What the end position iterator stores in the private data area is
+    // intentionally undefined.
+
+    mtv_type db(9);
+
+    // With only a single block
+
+    mtv_type::iterator it = db.begin();
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+
+    it = db.end();
+    --it;
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+
+    // With 3 blocks (sizes of 4, 3, and 2 in this order)
+
+    db.set(4, 1.1);
+    db.set(5, 1.1);
+    db.set(6, 1.1);
+
+    it = db.begin();
+    assert(it->size == 4);
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+    ++it;
+    assert(it->size == 3);
+    assert(it->position == 4);
+    assert(it->__private_data.block_index == 1);
+    ++it;
+    assert(it->size == 2);
+    assert(it->position == 7);
+    assert(it->__private_data.block_index == 2);
+
+    ++it;
+    assert(it == db.end()); // end position reached.
+
+    // Go in reverse direction.
+    --it;
+    assert(it->size == 2);
+    assert(it->position == 7);
+    assert(it->__private_data.block_index == 2);
+    --it;
+    assert(it->size == 3);
+    assert(it->position == 4);
+    assert(it->__private_data.block_index == 1);
+    --it;
+    assert(it->size == 4);
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+    assert(it == db.begin());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/iterators_insert.inl b/test/multi_type_vector/default/tc/iterators_insert.inl
new file mode 100644
index 0000000..2a351b5
--- /dev/null
+++ b/test/multi_type_vector/default/tc/iterators_insert.inl
@@ -0,0 +1,232 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_iterators_insert()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type::iterator it, check;
+    std::vector<double> doubles;
+    std::vector<bool> bools;
+    std::vector<std::string> strings;
+    std::vector<int32_t> ints;
+
+    // Insert values into empty block.  They are to be appended to the previous block.
+    mtv_type db(10); // start with empty set.
+    db.set(0, std::string("top"));
+    db.set(3, 0.9);
+    doubles.resize(4, 1.1);
+    it = db.insert(4, doubles.begin(), doubles.end());
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    assert(it->size == 5);
+    assert(it->position == 3);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 6);
+    ++it;
+    assert(it == db.end());
+
+    // Same as above, except that the values will not be appended to the previous block.
+    db = mtv_type(3);
+    db.set(0, std::string("top"));
+    doubles.resize(5, 3.3);
+    it = db.insert(1, doubles.begin(), doubles.end());
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 2);
+    ++it;
+    assert(it == db.end());
+
+    // Insert into the middle of an empty block.
+    db = mtv_type(2);
+    doubles.resize(3, 1.2);
+    it = db.insert(1, doubles.begin(), doubles.end());
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_empty);
+    assert(check->size == 1);
+    ++check;
+    assert(check == it);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 3);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+
+    // Insert into a block of the same type.
+    db = mtv_type(5, false);
+    db.set(0, std::string("top"));
+    db.set(4, std::string("bottom"));
+    bools.resize(3, true);
+    it = db.insert(2, bools.begin(), bools.end());
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 6);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Insert values which will be append to the previous block.
+    db = mtv_type(5, 1.1);
+    strings.resize(3, std::string("test"));
+    db.set(0, true);
+    db.set(2, strings.begin(), strings.end()); // 2 thru 4
+    doubles.resize(2, 2.2);
+    it = db.insert(2, doubles.begin(), doubles.end());
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 3);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->size == 3);
+    ++it;
+    assert(it == db.end());
+
+    // Insert between blocks without merge.
+    db = mtv_type(3);
+    db.set(0, 1.1);
+    db.set(1, std::string("middle"));
+    db.set(2, int32_t(50));
+    bools.resize(4, true);
+    it = db.insert(1, bools.begin(), bools.end());
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_double);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 4);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->size == 1);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+
+    // Insert values of differing type into middle of a block.
+    db = mtv_type(4, 0.01);
+    db.set(0, std::string("top"));
+    ints.resize(3, 55);
+    it = db.insert(2, ints.begin(), ints.end());
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_string);
+    assert(check->size == 1);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_double);
+    assert(check->size == 1);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_int32);
+    assert(it->size == 3);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 2);
+    ++it;
+    assert(it == db.end());
+}
+
+void mtv_test_iterators_insert_empty()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // Insert into an already empty spot.
+    mtv_type db(2);
+    db.set(1, 1.2);
+    mtv_type::iterator it = db.insert_empty(0, 3);
+    assert(it == db.begin());
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+
+    // Insert an empty range that will be tucked into the previous empty block.
+    db = mtv_type(4);
+    db.set(0, std::string("foo"));
+    db.set(2, 1.1);
+    db.set(3, 1.2);
+    it = db.insert_empty(2, 2);
+    mtv_type::iterator check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 3);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 2);
+    ++it;
+    assert(it == db.end());
+
+    // Insert an empty range between non-empty blocks.
+    db = mtv_type(2, false);
+    db.set(0, 1.1);
+    it = db.insert_empty(1, 2);
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_double);
+    assert(check->size == 1);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 2);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+
+    // Insert in the middle of a non-empty block.
+    db = mtv_type(3, std::string("foo"));
+    it = db.insert_empty(2, 4);
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_string);
+    assert(check->size == 2);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 4);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/iterators_set.inl b/test/multi_type_vector/default/tc/iterators_set.inl
new file mode 100644
index 0000000..08df963
--- /dev/null
+++ b/test/multi_type_vector/default/tc/iterators_set.inl
@@ -0,0 +1,889 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+/**
+ * Test the variant of set() method that takes iterators.
+ */
+void mtv_test_iterators_set()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    // single element only
+    mtv_type db(1);
+    mtv_type::iterator it = db.set(0, 1.1);
+    assert(it == db.begin());
+
+    // Set value to the top of the only block.
+    db.clear();
+    db.resize(3);
+    it = db.set(0, 1.2);
+    assert(it == db.begin());
+
+    // Set value to the bottom of the only block.
+    db.clear();
+    db.resize(3);
+    it = db.set(2, 1.3);
+    mtv_type::iterator check = db.begin();
+    ++check;
+    assert(it == check);
+    check = db.end();
+    --check;
+    assert(it == check);
+
+    // Set value to the middle of the only block.
+    db.clear();
+    db.resize(3);
+    it = db.set(1, 1.4);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    check = db.end();
+    std::advance(check, -2);
+    assert(it == check);
+    assert(it->position == 1);
+    assert(it->__private_data.block_index == 1);
+
+    // Set value to the top empty block of size 1 followed by a non-empty block.
+    db.clear();
+    db.resize(2);
+    db.set(1, 2.1);
+    it = db.set(0, 2.2); // same type as that of the following block.
+    assert(it == db.begin());
+    assert(it->size == 2);
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+    db.set_empty(0, 0);
+    it = db.set(0, true); // different type from that of the following block.
+    assert(it == db.begin());
+    assert(it->size == 1);
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+
+    // Set value to the top of the top empty block (not size 1) followed by a non-empty block.
+    db.clear();
+    db.resize(3);
+    db.set(2, true);
+    it = db.set(0, 5.1);
+    assert(it == db.begin());
+
+    // Set value to the bottom of the top empty block (not size 1) followed by a non-empty block.
+    db.clear();
+    db.resize(3);
+    db.set(2, 6.1);
+    it = db.set(1, 6.2); // same type as that of the following block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    check = db.end();
+    --check;
+    assert(it == check);
+    assert(it->size == 2);
+    assert(it->position == 1);
+    assert(it->__private_data.block_index == 1);
+    db.set_empty(0, 1);
+    it = db.set(1, true); // different type from that of the following block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    check = db.end();
+    std::advance(check, -2);
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->position == 1);
+    assert(it->__private_data.block_index == 1);
+
+    // Set value to the middle of the top empty block (not size 1) followed by a non-empty block.
+    db.clear();
+    db.resize(6);
+    db.set(5, 1.1);
+    it = db.set(3, 1.2);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->position == 3);
+    assert(it->__private_data.block_index == 1);
+
+    // Set value to an empty block of size 1 immediately below a non-empty block.
+    db.clear();
+    db.resize(2);
+    db.set(0, true);
+    it = db.set(1, false); // same type as that of the previous block.
+    assert(it == db.begin());
+
+    // Set value to an empty block of size 1 between non-empty blocks of the same type.
+    db = mtv_type(3, true);
+    db.set_empty(1, 1);
+    it = db.set(1, false);
+    assert(it == db.begin());
+    assert(it->size == 3);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to an empty block of size 1 between non-empty blocks. The
+    // previous block is of the same type as that of the inserted value.
+    db = mtv_type(3, 1.1);
+    db.set_empty(0, 1);
+    db.set(0, true);
+    it = db.set(1, false);
+    assert(it == db.begin());
+    assert(it->size == 2);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Set value to the top of an empty block (not of size 1) following a
+    // non-empty block of the same type.
+    db.clear();
+    db.resize(3);
+    db.set(0, true);
+    it = db.set(1, false);
+    assert(it == db.begin());
+    assert(it->size == 2);
+
+    // Set value to an empty block of size 1, following a non-empty block of different type.
+    db = mtv_type(2);
+    db.set(0, true);
+    it = db.set(1, 1.1);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to an empty block of size 1, following a non-empty block of
+    // different type and followed by a non-empty block of different type.
+    db = mtv_type(3, true);
+    db.set_empty(1, 1);
+    it = db.set(1, 2.1);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Set value to an empty block of size 1, following a non-empty block of
+    // different type but followed by a non-empty block of the same type.
+    db.clear();
+    db.resize(3);
+    db.set(0, true);
+    it = db.set(2, 2.1);
+    ++it;
+    assert(it == db.end());
+    it = db.set(1, 2.2); // same type as that of the following block.
+    assert(it->size == 2);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the top of an empty block (not of size 1) between
+    // non-empty blocks. The previous block is of different type.
+    db.clear();
+    db.resize(4);
+    db.set(0, true);
+    db.set(3, false);
+    it = db.set(1, 2.2);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->position == 1);
+
+    // Set value to the bottom of an empty block (not of size 1) between
+    // non-empty blocks.
+    db = mtv_type(7, false);
+    db.set_empty(2, 4);
+    it = db.set(4, true); // Same type as that of the following block.
+    assert(it->size == 3);
+    assert(it->position == 4);
+    assert(it->__private_data.block_index == 2);
+    ++it;
+    assert(it == db.end());
+
+    db.set_empty(2, 4);
+    it = db.set(4, 1.1); // Different type from that of the following block.
+    assert(it->size == 1);
+    assert(it->position == 4);
+    assert(it->__private_data.block_index == 2);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Set value to the middle of an empty block between non-empty blocks.
+    db = mtv_type(12, true);
+    db.set_empty(3, 7);
+    it = db.set(5, 4.3);
+    assert(it->size == 1);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(check == it);
+    ++it;
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to existing block of the same type.
+    it = db.set(5, 4.5);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    assert(it->size == 1);
+    std::advance(it, 3);
+    assert(it == db.end());
+
+    // Set value to the top of an existing topmost block of different type.
+    db = mtv_type(5, true);
+    it = db.set(0, 1.1);
+    assert(it == db.begin());
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Set value to the top of an existing block of different type.  The block
+    // is below an empty block.
+    db = mtv_type(10, true);
+    db.set_empty(0, 4);
+    it = db.set(5, 2.1);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Set value to the top of an existing block of different type.  The block
+    // is below a non-empty block.
+    db = mtv_type(10, true);
+    std::vector<double> doubles(3, 1.1);
+    db.set(2, doubles.begin(), doubles.end()); // set double's to 2 thru 4.
+    it = db.set(5, 2.1); // append to the previous block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    db = mtv_type(10, true);
+    db.set(2, doubles.begin(), doubles.end()); // set double's to 2 thru 4.
+    it = db.set(5, std::string("foo")); // type different from that of the previous block.
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Set value to the middle of an existing non-empty block.
+    db = mtv_type(10, true);
+    doubles.clear();
+    doubles.resize(3, 2.3);
+    db.set(0, doubles.begin(), doubles.end()); // set double's to 0 thru 2.
+    it = db.set(6, std::string("text"));
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->position == 6);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    ++it;
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the bottom of the only block that's non-empty.
+    db = mtv_type(10, false);
+    it = db.set(9, 2.1);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the bottom of the topmost non-empty block which is
+    // followed by an empty block.
+    db = mtv_type(10, false);
+    db.set_empty(5, 9);
+    it = db.set(4, 1.1);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->position == 4);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db.end());
+
+    // This time the following block is not empty but is of different type
+    // than that of the value being set.
+    db = mtv_type(10, false);
+    doubles.clear();
+    doubles.resize(5, 2.1);
+    db.set(5, doubles.begin(), doubles.end()); // numeric at 5 thru 9
+    it = db.set(4, std::string("foo"));
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    // Same as before, but the value being set is of the same type as that of
+    // the following block.
+    db = mtv_type(10, false);
+    doubles.clear();
+    doubles.resize(5, 2.1);
+    db.set(5, doubles.begin(), doubles.end()); // numeric at 5 thru 9
+    it = db.set(4, 4.5); // same type as the following block.
+    assert(it->size == 6);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the bottom of the last non-empty block.
+    db = mtv_type(10, false);
+    doubles.clear();
+    doubles.resize(4, 3.1);
+    db.set(6, doubles.begin(), doubles.end()); // numeric at 6 thru 9
+    it = db.set(9, true);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the bottom of an non-empty block followed by an empty block.
+    db = mtv_type(10, false);
+    doubles.clear();
+    doubles.resize(3, 3.3);
+    db.set(2, doubles.begin(), doubles.end()); // numeric at 2 thru 4.
+    db.set_empty(5, 9);
+    it = db.set(4, std::string("foo"));
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->position == 4);
+    assert(it->__private_data.block_index == 2);
+    ++it;
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db.end());
+
+    // Same as before, except the following block isn't empty but of different type.
+    db = mtv_type(10, false);
+    db.set(4, doubles.begin(), doubles.end()); // numeric at 4 thru 6.
+    it = db.set(6, std::string("foo")); // 7 thru 9 is boolean.
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->position == 6);
+    assert(it->__private_data.block_index == 2);
+    ++it;
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->position == 7);
+    ++it;
+    assert(it == db.end());
+
+    // Same as before, except the following block is now of the same type.
+    db = mtv_type(10, false);
+    db.set(4, doubles.begin(), doubles.end()); // numeric at 4 thru 6.
+    it = db.set(6, true); // 7 thru 9 is boolean.
+
+    // Set value to the only block (non-empty) of size 1.
+    db = mtv_type(1, true);
+    it = db.set(0, 1.1);
+    assert(it == db.begin());
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+
+    // Set value to the topmost non-empty block of size 1, followed by an empty block.
+    db.resize(5);
+    it = db.set(0, std::string("foo"));
+    assert(it == db.begin());
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    ++it;
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the topmost non-empty block of size 1, followed by a non-empty block.
+    db = mtv_type(5, true);
+    db.set(0, 1.1);
+    it = db.set(0, std::string("foo"));
+    assert(it == db.begin());
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    ++it;
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // This time set value whose type is the same as that of the following block.
+    it = db.set(0, false);
+    assert(it == db.begin());
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Set value to the topmost non-empty block of size 1, preceded by an empty block.
+    db = mtv_type(5);
+    db.set(4, true);
+    it = db.set(4, 1.2);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    // This time the preceding block is not empty, but of different type.
+    db = mtv_type(5, false);
+    db.set(0, std::string("baa"));
+    db.set(4, std::string("foo"));
+    it = db.set(4, 1.2);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    it = db.set(4, true); // Now set value whose type is the same as that of the preceding block.
+    check = db.end();
+    --check;
+    assert(it == check);
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    --it;
+    assert(it == db.begin());
+
+    // Set value to a non-empty block of size 1 that lies between existing blocks.
+    db = mtv_type(10);
+    db.set(7, true);
+    it = db.set(7, 1.1); // Both preceding and following blocks are empty.
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db.end());
+
+    db = mtv_type(10, true);
+    doubles.clear();
+    doubles.resize(8, 2.1);
+    db.set(2, doubles.begin(), doubles.end()); // Set 2 thru 9 numeric.
+    db.set(6, false);
+    it = db.set(6, std::string("foo")); // Both preceding and following blocks are non-empty.
+    check = db.end();
+    std::advance(check, -2);
+    assert(it == check);
+    --it;
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->position == 2);
+    --it;
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->position == 0);
+    assert(it == db.begin());
+
+    it = db.set(6, 4.5); // Same type as those of the preceding and following blocks.
+    assert(it->size == 8);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->position == 2);
+    assert(it->__private_data.block_index == 1);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it == db.end());
+
+    db = mtv_type(10, true);
+    db.set(4, static_cast<int32_t>(34));
+    doubles.resize(5, 2.3);
+    db.set(5, doubles.begin(), doubles.end());
+    it = db.set(4, false); // Same type as that of the preceding block.
+    assert(it == db.begin());
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    db.set(4, static_cast<int32_t>(35)); // Reset to previous state.
+    it = db.set(4, 4.5); // Same type as that of the following block.
+    assert(it->size == 6);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    db.set(4, static_cast<int32_t>(36)); // Reset again.
+    it = db.set(4, static_cast<int16_t>(28)); // Different type from either of the blocks.
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_int16);
+    assert(it->position == 4);
+    assert(it->__private_data.block_index == 1);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Preceding block is empty, and the following block is non-empty.
+    db = mtv_type(10);
+    doubles.resize(3, 1.1);
+    db.set(7, doubles.begin(), doubles.end()); // 7 thru 9 to be numeric.
+    db.set(6, static_cast<int32_t>(23));
+    it = db.set(6, std::string("foo")); // Type different from that of the following block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->position == 6);
+    ++it;
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->position == 7);
+    ++it;
+    assert(it == db.end());
+
+    db.set(6, static_cast<int32_t>(24)); // Reset.
+    it = db.set(6, 4.5); // This time the same type as that of the following block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    // Now, the preceding block is not empty while the following block is.
+    db = mtv_type(10, static_cast<uint16_t>(10));
+    db.set_empty(4, 6);
+    db.set(3, 1.2);
+    it = db.set(3, static_cast<uint16_t>(11)); // Same as the previous block.
+    assert(it == db.begin());
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_uint16);
+    std::advance(it, 3);
+    assert(it == db.end());
+
+    db.set(3, 1.3); // Reset
+    it = db.set(3, std::string("foo")); // This time, different from the previous block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    std::advance(it, 3);
+    assert(it == db.end());
+}
+
+/**
+ * Test the variant of set() method that takes iterators (part 2).
+ */
+void mtv_test_iterators_set_2()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type::iterator it, check;
+    std::vector<double> doubles(3, 1.1);
+    std::deque<bool> bools;
+    std::vector<std::string> strings;
+
+    // simple overwrite.
+    mtv_type db(10, 2.3);
+    db.set(0, true);
+    db.set(1, std::string("foo"));
+    it = db.set(2, doubles.begin(), doubles.end());
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    ++it;
+    assert(it == db.end());
+
+    // Insert and merge with previous block.
+    db = mtv_type(10, true);
+    db.set(5, 1.1);
+    db.set(6, 1.2);
+    db.set(7, 1.3);
+    db.set(8, std::string("foo"));
+    bools.resize(3, false);
+    it = db.set(5, bools.begin(), bools.end());
+    assert(it == db.begin());
+    assert(it->size == 8);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    std::advance(it, 3);
+    assert(it == db.end());
+
+    // Insert and merge with previous and next blocks.
+    db = mtv_type(10, true);
+    db.set(0, std::string("foo"));
+    db.set(5, 1.1);
+    db.set(6, 1.2);
+    db.set(7, 1.3);
+    it = db.set(5, bools.begin(), bools.end());
+    assert(db.block_size() == 2);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 9);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Insert and merge with next block only.
+    db = mtv_type(10); // start empty.
+    db.set(4, true);
+    db.set(5, true);
+    db.set(6, true);
+    db.set(7, 1.1);
+    db.set(8, 1.2);
+    db.set(9, 1.3);
+    doubles.resize(3, 2.2);
+    it = db.set(4, doubles.begin(), doubles.end());
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 6);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it == db.end());
+
+    // Replace the upper part of a block and merge with previous block.
+    db = mtv_type(10, false);
+    db.set(3, 1.2);
+    db.set(4, 1.3);
+    db.set(5, 1.4);
+    db.set(6, 1.5);
+    db.set(7, 1.6);
+    bools.resize(3, true);
+    it = db.set(3, bools.begin(), bools.end());
+    assert(it == db.begin());
+    assert(it->size == 6);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    std::advance(it, 3);
+    assert(it == db.end());
+
+    // Replace the upper part of a block but don't merge with previous block.
+    db = mtv_type(10, false);
+    db.set(3, std::string("A"));
+    db.set(4, std::string("B"));
+    db.set(5, std::string("C"));
+    db.set(6, std::string("D"));
+    db.set(7, std::string("E"));
+    doubles.resize(3, 1.1);
+    it = db.set(3, doubles.begin(), doubles.end());
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_string);
+    ++it;
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Overwrite the lower part of a block and merge it with the next block.
+    db = mtv_type(10, false);
+    db.set(0, 2.2);
+    db.set(4, 1.1);
+    db.set(5, 1.2);
+    db.set(6, 1.3);
+    assert(db.block_size() == 4);
+    bools.resize(2, true);
+    it = db.set(5, bools.begin(), bools.end()); // 5 to 6
+    check = db.begin();
+    std::advance(check, 3);
+    assert(it == check);
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    // Overwrite the lower part of a block but don't merge it with the next block.
+    db = mtv_type(10, std::string("boo"));
+    db.set(0, 1.1);
+    db.set(5, true);
+    db.set(6, true);
+    db.set(7, true);
+    doubles.resize(2, 2.2);
+    it = db.set(6, doubles.begin(), doubles.end());
+    check = db.begin();
+    std::advance(check, 3);
+    assert(it == check);
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_double);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Overwrite the lower part of the last block.
+    db = mtv_type(10, std::string("boo"));
+    db.set(0, 1.1);
+    doubles.resize(3, 2.2);
+    it = db.set(7, doubles.begin(), doubles.end());
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    ++it;
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it == db.end());
+
+    // Overwrite the middle part of a block.
+    db = mtv_type(10);
+    bools.resize(5, true);
+    it = db.set(3, bools.begin(), bools.end());
+    check = db.begin();
+    ++check;
+    assert(check == it);
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_boolean);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // Overwrite multiple blocks with values whose type matches that of the top block.
+    int32_t int_val = 255;
+    db = mtv_type(10, int_val);
+    bools.resize(6, true);
+    db.set(4, bools.begin(), bools.end()); // set 4 thru 9 to bool.
+    db.set(5, 1.1);
+    db.set(7, std::string("foo"));
+    assert(db.block_size() == 6);
+    doubles.resize(4, 4.5);
+    it = db.set(5, doubles.begin(), doubles.end()); // 5 thrugh 8.
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_int32);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_boolean);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 4);
+    std::advance(it, 2);
+    assert(it == db.end());
+
+    // The same scenario, except that the values also match that of the bottom block.
+    db = mtv_type(10, 1.1);
+    db.set(5, true);
+    assert(db.block_size() == 3);
+    doubles.resize(3, 2.3);
+    it = db.set(4, doubles.begin(), doubles.end());
+    assert(db.block_size() == 1);
+    assert(it == db.begin());
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 10);
+    ++it;
+    assert(it == db.end());
+
+    // This time, the top block is of different type.
+    db = mtv_type(10, false);
+    doubles.resize(4, 4.5);
+    db.set(3, doubles.begin(), doubles.end()); // 3 thru 6
+    db.set(0, int32_t(1));
+    strings.resize(4, std::string("test"));
+    it = db.set(4, strings.begin(), strings.end()); // Overwrite the lower part of the top block.
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_int32);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_boolean);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_double);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->size == 4);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    ++it;
+    assert(it == db.end());
+
+    db = mtv_type(10, false);
+    db.set(0, 1.1);
+    db.set(4, 1.2);
+    db.set(5, 1.3);
+    db.set(6, std::string("a"));
+    db.set(7, std::string("b"));
+    doubles.resize(3, 0.8);
+    it = db.set(6, doubles.begin(), doubles.end()); // Merge with the upper block.
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_double);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_boolean);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 5);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+
+    // Make sure this also works in scenarios where the values merge with lower block.
+    db = mtv_type(20, false);
+    doubles.resize(4, 3.4);
+    db.set(5, doubles.begin(), doubles.end()); // 5 thru 8
+    strings.resize(5, "expanded");
+    db.set(11, strings.begin(), strings.end()); // 11 thru 15
+    strings.clear();
+    strings.resize(6, "overwriting");
+    it = db.set(7, strings.begin(), strings.end()); // 7 thru 12
+
+    // At this point, 7 thru 15 should be strings.
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->size == 9);
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_boolean);
+    assert(check->size == 5); // 0 thru 4
+    ++check;
+    assert(check->type == mdds::mtv::element_type_double);
+    assert(check->size == 2); // 5 thru 6
+    ++check;
+    assert(it == check);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 4); // 16 thru 19
+    ++it;
+    assert(it == db.end());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/iterators_set_empty.inl b/test/multi_type_vector/default/tc/iterators_set_empty.inl
new file mode 100644
index 0000000..91b72fa
--- /dev/null
+++ b/test/multi_type_vector/default/tc/iterators_set_empty.inl
@@ -0,0 +1,215 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_iterators_set_empty()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type::iterator it, check;
+
+    // Block is already empty. Calling the method does not do anything.
+    mtv_type db(10);
+    db.set(0, 1.1);
+    it = db.set_empty(6, 8);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+
+    // Empty a whole block.
+    db = mtv_type(10, false);
+    db.set(0, 1.1);
+    db.set(1, std::string("A"));
+    it = db.set_empty(2, 9);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 8);
+    ++it;
+    assert(it == db.end());
+
+    // Empty the upper part of a block.
+    std::vector<int16_t> shorts(8, 23);
+    db.set(2, shorts.begin(), shorts.end());
+    it = db.set_empty(2, 6);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 5);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_int16);
+    assert(it->size == 3);
+    ++it;
+    assert(it == db.end());
+
+    // Empty the lower part of a block.
+    db = mtv_type(10, std::string("foo"));
+    it = db.set_empty(3, 9);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 7);
+    ++it;
+    assert(it == db.end());
+
+    // Empty the middle part of a block.
+    db = mtv_type(10, std::string("baa"));
+    it = db.set_empty(3, 6);
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_string);
+    assert(check->size == 3);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 4);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->size == 3);
+    ++it;
+    assert(it == db.end());
+
+    // Empty multiple blocks. The first block is partially emptied.
+    db = mtv_type(10, false);
+    db.set(0, 1.1);
+    shorts.resize(3, 22);
+    db.set(4, shorts.begin(), shorts.end()); // 4 thru 6
+    it = db.set_empty(5, 8);
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_double);
+    assert(check->size == 1);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_boolean);
+    assert(check->size == 3);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_int16);
+    assert(check->size == 1);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 4);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 1);
+    ++it;
+    assert(it == db.end());
+
+    // This time, the first block is completely emptied.
+    db = mtv_type(10, false);
+    db.set(0, 1.2);
+    shorts.resize(3, 42);
+    db.set(4, shorts.begin(), shorts.end()); // 4 thru 6
+    it = db.set_empty(4, 7);
+    check = db.begin();
+    assert(check->type == mdds::mtv::element_type_double);
+    assert(check->size == 1);
+    ++check;
+    assert(check->type == mdds::mtv::element_type_boolean);
+    assert(check->size == 3);
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 4);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_boolean);
+    assert(it->size == 2);
+    ++it;
+    assert(it == db.end());
+
+    // And this time, the first block is partially emptied but it's already an
+    // empty block to begin with.
+    db = mtv_type(10);
+    db.set(0, std::string("top"));
+    std::vector<double> doubles(5, 1.2);
+    db.set(5, doubles.begin(), doubles.end()); // 5 thru 9
+    it = db.set_empty(3, 7);
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 7);
+    ++it;
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 2);
+    ++it;
+    assert(it == db.end());
+
+    db = mtv_type(10);
+    db.set(0, true);
+    db.set(5, 1.1);
+    it = db.set_empty(5, 5); // Merge with previous and next blocks.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 9);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->position == 1);
+    assert(it->__private_data.block_index == 1);
+    ++it;
+    assert(it == db.end());
+
+    doubles.resize(3, 32.3);
+    db.set(4, doubles.begin(), doubles.end()); // 4 thru 6
+    assert(db.block_size() == 4);
+    it = db.set_empty(4, 5); // Merge with the previous block.
+    check = db.begin();
+    ++check;
+    assert(it == check);
+    assert(it->size == 5);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->position == 1);
+    assert(it->__private_data.block_index == 1);
+    ++it;
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it->size == 3);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db.end());
+
+    db = mtv_type(10);
+    db.set(9, false);
+    db.set(3, 1.1);
+    db.set(4, 1.2);
+    db.set(5, 1.3);
+    assert(db.block_size() == 4);
+    it = db.set_empty(5, 5); // Merge with the next empty block.
+    assert(db.block_size() == 4);
+    check = db.begin();
+    std::advance(check, 2);
+    assert(it == check);
+    assert(it->size == 4);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->__private_data.block_index == 2);
+    assert(it->position == 5);
+    std::advance(it, 2);
+    assert(it == db.end());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/misc.inl b/test/multi_type_vector/default/tc/misc.inl
new file mode 100644
index 0000000..96d0b67
--- /dev/null
+++ b/test/multi_type_vector/default/tc/misc.inl
@@ -0,0 +1,556 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+enum test_mtv_type
+{
+    _mtv_bool,
+    _mtv_int8,
+    _mtv_uint8,
+    _mtv_int16,
+    _mtv_uint16,
+    _mtv_int32,
+    _mtv_uint32,
+    _mtv_int64,
+    _mtv_uint64,
+    _mtv_float,
+    _mtv_double,
+    _mtv_string,
+};
+
+#define TEST_TYPE(_type_, _type_enum_) \
+    test_mtv_type test_type(_type_) \
+    { \
+        return _type_enum_; \
+    }
+TEST_TYPE(bool, _mtv_bool)
+TEST_TYPE(int8_t, _mtv_int8)
+TEST_TYPE(uint8_t, _mtv_uint8)
+TEST_TYPE(int16_t, _mtv_int16)
+TEST_TYPE(uint16_t, _mtv_uint16)
+TEST_TYPE(int32_t, _mtv_int32)
+TEST_TYPE(uint32_t, _mtv_uint32)
+TEST_TYPE(int64_t, _mtv_int64)
+TEST_TYPE(uint64_t, _mtv_uint64)
+TEST_TYPE(float, _mtv_float)
+TEST_TYPE(double, _mtv_double)
+TEST_TYPE(std::string, _mtv_string)
+
+void mtv_test_misc_types()
+{
+    // Test function overloading of standard types.
+
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        bool val = false;
+        assert(test_type(val) == _mtv_bool);
+        cout << "bool is good" << endl;
+    }
+    {
+        int16_t val = 0;
+        assert(test_type(val) == _mtv_int16);
+        cout << "int16 is good" << endl;
+    }
+    {
+        uint16_t val = 0;
+        assert(test_type(val) == _mtv_uint16);
+        cout << "uint16 is good" << endl;
+    }
+    {
+        int32_t val = 0;
+        assert(test_type(val) == _mtv_int32);
+        cout << "int32 is good" << endl;
+    }
+    {
+        uint32_t val = 0;
+        assert(test_type(val) == _mtv_uint32);
+        cout << "uint32 is good" << endl;
+    }
+    {
+        int64_t val = 0;
+        assert(test_type(val) == _mtv_int64);
+        cout << "int64 is good" << endl;
+    }
+    {
+        uint64_t val = 0;
+        assert(test_type(val) == _mtv_uint64);
+        cout << "uint64 is good" << endl;
+    }
+    {
+        float val = 0;
+        assert(test_type(val) == _mtv_float);
+        cout << "float is good" << endl;
+    }
+    {
+        double val = 0;
+        assert(test_type(val) == _mtv_double);
+        cout << "double is good" << endl;
+    }
+    {
+        std::string val;
+        assert(test_type(val) == _mtv_string);
+        cout << "string is good" << endl;
+    }
+    {
+        int8_t val = 0;
+        assert(test_type(val) == _mtv_int8);
+        cout << "int8 is good" << endl;
+    }
+    {
+        uint8_t val = 0;
+        assert(test_type(val) == _mtv_uint8);
+        cout << "uint8 is good" << endl;
+    }
+}
+
+void mtv_test_misc_swap()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db1(3), db2(5);
+    db1.set(0, 1.0);
+    db1.set(1, 2.0);
+    db1.set(2, 3.0);
+
+    db2.set(0, 4.0);
+    db2.set(1, 5.0);
+    db2.set(4, std::string("foo"));
+    db1.swap(db2);
+
+    assert(db1.size() == 5 && db1.block_size() == 3);
+    assert(db2.size() == 3 && db2.block_size() == 1);
+}
+
+void mtv_test_misc_equality()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        // Two columns of equal size.
+        mtv_type db1(3), db2(3);
+        assert(db1 == db2);
+        db1.set(0, 1.0);
+        assert(db1 != db2);
+        db2.set(0, 1.0);
+        assert(db1 == db2);
+        db2.set(0, 1.2);
+        assert(db1 != db2);
+        db1.set(0, 1.2);
+        assert(db1 == db2);
+    }
+
+    {
+        // Two columns of different sizes.  They are always non-equal no
+        // matter what.
+        mtv_type db1(3), db2(4);
+        assert(db1 != db2);
+        db1.set(0, 1.2);
+        db2.set(0, 1.2);
+        assert(db1 != db2);
+
+        // Comparison to self.
+        assert(db1 == db1);
+        assert(db2 == db2);
+    }
+
+    {
+        // Two containers both consisting of numeric - empty - numeric blocks,
+        // and the last numeric blocks differ.
+
+        mtv_type db1(5), db2(5);
+        db1.set(0, 1.1);
+        db1.set(3, 2.1);
+        db1.set(4, 2.2);
+
+        db2.set(0, 1.1);
+        db2.set(3, 2.1);
+        db2.set(4, 2.3); // different value
+
+        assert(db1 != db2);
+    }
+
+    {
+        mtv_type db1(2), db2(2);
+        db1.set(1, 10.1);
+        db2.set(1, 10.1);
+        assert(db1 == db2);
+
+        db2.set(0, std::string("foo"));
+        assert(db1 != db2);
+
+        db1.set(0, std::string("foo"));
+        assert(db1 == db2);
+
+        db2.set_empty(0, 0);
+        assert(db1 != db2);
+    }
+}
+
+void mtv_test_misc_clone()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db1(3);
+    db1.set(0, 3.4);
+    db1.set(1, std::string("foo"));
+    db1.set(2, true);
+
+    // copy construction
+
+    mtv_type db2(db1);
+    assert(db1.size() == db2.size());
+    assert(db1.block_size() == db2.block_size());
+    assert(db1 == db2);
+
+    {
+        double test1, test2;
+        db1.get(0, test1);
+        db2.get(0, test2);
+        assert(test1 == test2);
+    }
+    {
+        std::string test1, test2;
+        db1.get(1, test1);
+        db2.get(1, test2);
+        assert(test1 == test2);
+    }
+
+    {
+        bool test1, test2;
+        db1.get(2, test1);
+        db2.get(2, test2);
+        assert(test1 == test2);
+    }
+
+    // assignment
+
+    mtv_type db3 = db1;
+    assert(db3 == db1);
+    db3.set(0, std::string("alpha"));
+    assert(db3 != db1);
+
+    mtv_type db4, db5;
+    db4 = db5 = db3;
+    assert(db4 == db5);
+    assert(db3 == db5);
+    assert(db3 == db4);
+}
+
+void mtv_test_misc_resize()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(0);
+    assert(db.size() == 0);
+    assert(db.empty());
+
+    // Resize to create initial empty block.
+    db.resize(3);
+    assert(db.size() == 3);
+    assert(db.block_size() == 1);
+
+    // Resize to increase the existing empty block.
+    db.resize(5);
+    assert(db.size() == 5);
+    assert(db.block_size() == 1);
+
+    for (long row = 0; row < 5; ++row)
+        db.set(row, static_cast<double>(row));
+
+    assert(db.size() == 5);
+    assert(db.block_size() == 1);
+
+    // Increase its size by one.  This should append an empty cell block of size one.
+    db.resize(6);
+    assert(db.size() == 6);
+    assert(db.block_size() == 2);
+    assert(db.is_empty(5));
+
+    // Do it again.
+    db.resize(7);
+    assert(db.size() == 7);
+    assert(db.block_size() == 2);
+
+    // Now, reduce its size to eliminate the last empty block.
+    db.resize(5);
+    assert(db.size() == 5);
+    assert(db.block_size() == 1);
+
+    // Reset.
+    db.resize(7);
+    assert(db.size() == 7);
+    assert(db.block_size() == 2);
+
+    // Now, resize across multiple blocks.
+    db.resize(4);
+    assert(db.size() == 4);
+    assert(db.block_size() == 1);
+    double test;
+    db.get(3, test);
+    assert(test == 3.0);
+
+    // Empty it.
+    db.resize(0);
+    assert(db.size() == 0);
+    assert(db.block_size() == 0);
+    assert(db.empty());
+}
+
+void mtv_test_misc_value_type()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db(5);
+    db.set(0, 1.1);
+    db.set(1, std::string("A"));
+    db.set(2, std::string("B"));
+    db.set(3, int32_t(12));
+    db.set(4, int16_t(8));
+
+    std::for_each(db.begin(), db.end(), [](const mtv_type::value_type& node) {
+        cout << "type: " << node.type << "  size: " << node.size << "  data: " << node.data << endl;
+    });
+}
+
+void mtv_test_misc_block_identifier()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    assert(mdds::mtv::double_element_block::block_type == mdds::mtv::element_type_double);
+    assert(mdds::mtv::string_element_block::block_type == mdds::mtv::element_type_string);
+    assert(mdds::mtv::int16_element_block::block_type == mdds::mtv::element_type_int16);
+    assert(mdds::mtv::uint16_element_block::block_type == mdds::mtv::element_type_uint16);
+    assert(mdds::mtv::int32_element_block::block_type == mdds::mtv::element_type_int32);
+    assert(mdds::mtv::uint32_element_block::block_type == mdds::mtv::element_type_uint32);
+    assert(mdds::mtv::int64_element_block::block_type == mdds::mtv::element_type_int64);
+    assert(mdds::mtv::uint64_element_block::block_type == mdds::mtv::element_type_uint64);
+    assert(mdds::mtv::boolean_element_block::block_type == mdds::mtv::element_type_boolean);
+    assert(mdds::mtv::int8_element_block::block_type == mdds::mtv::element_type_int8);
+    assert(mdds::mtv::uint8_element_block::block_type == mdds::mtv::element_type_uint8);
+}
+
+void mtv_test_misc_push_back()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db;
+    assert(db.size() == 0);
+    assert(db.block_size() == 0);
+
+    // Append an empty element into an empty container.
+    mtv_type::iterator it = db.push_back_empty();
+    assert(db.size() == 1);
+    assert(db.block_size() == 1);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->__private_data.block_index == 0);
+    assert(it == db.begin());
+    ++it;
+    assert(it == db.end());
+
+    // ... and again.
+    it = db.push_back_empty();
+    assert(db.size() == 2);
+    assert(db.block_size() == 1);
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->__private_data.block_index == 0);
+    assert(it == db.begin());
+    ++it;
+    assert(it == db.end());
+
+    // Append non-empty this time.
+    it = db.push_back(1.1);
+    assert(db.size() == 3);
+    assert(db.block_size() == 2);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->__private_data.block_index == 1);
+    mtv_type::iterator check = it;
+    --check;
+    assert(check == db.begin());
+    ++it;
+    assert(it == db.end());
+
+    // followed by an empty element again.
+    it = db.push_back_empty();
+    assert(db.size() == 4);
+    assert(db.block_size() == 3);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->__private_data.block_index == 2);
+    check = it;
+    --check;
+    --check;
+    assert(check == db.begin());
+    ++it;
+    assert(it == db.end());
+
+    // Check the values.
+    assert(db.is_empty(0));
+    assert(db.is_empty(1));
+    assert(db.get<double>(2) == 1.1);
+    assert(db.is_empty(3));
+
+    // Empty the container and push back a non-empty element.
+    db.clear();
+    it = db.push_back(std::string("push me"));
+    assert(db.size() == 1);
+    assert(db.block_size() == 1);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->__private_data.block_index == 0);
+    assert(it == db.begin());
+    ++it;
+    assert(it == db.end());
+    assert(db.get<std::string>(0) == "push me");
+
+    // Push back a non-empty element of the same type.
+    it = db.push_back(std::string("again"));
+    assert(db.size() == 2);
+    assert(db.block_size() == 1);
+    assert(it->size == 2);
+    assert(it->type == mdds::mtv::element_type_string);
+    assert(it->__private_data.block_index == 0);
+    assert(it == db.begin());
+    ++it;
+    assert(it == db.end());
+
+    assert(db.get<std::string>(0) == "push me");
+    assert(db.get<std::string>(1) == "again");
+
+    // Push back another non-empty element of a different type.
+    it = db.push_back(23.4);
+    assert(db.size() == 3);
+    assert(db.block_size() == 2);
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+}
+
+void mtv_test_misc_capacity()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(10, 1.1);
+    assert(db.block_size() == 1);
+    mtv_type::const_iterator it = db.begin();
+    assert(it->type == mdds::mtv::element_type_double);
+    size_t cap = mdds::mtv::double_element_block::capacity(*it->data);
+    assert(cap == 10);
+
+    db.set_empty(3, 3);
+    assert(db.block_size() == 3);
+    db.shrink_to_fit();
+    it = db.begin();
+    assert(it->type == mdds::mtv::element_type_double);
+    cap = mdds::mtv::double_element_block::capacity(*it->data);
+    assert(cap == 3);
+}
+
+void mtv_test_misc_position_type_end_position()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    auto run = [](auto& db) {
+        auto pos1 = db.position(9); // last valid position.
+        pos1 = mtv_type::next_position(pos1);
+        auto pos2 = db.position(10); // end position - one position past the last valid position
+        assert(pos1 == pos2);
+
+        // Move back from the end position by one. It should point to the last
+        // valid position.
+        pos2 = mtv_type::advance_position(pos2, -1);
+        pos1 = db.position(9);
+        assert(pos1 == pos2);
+
+        // Try the variant of position() method that takes position hint as its first argument.
+        pos1 = db.position(db.begin(), 10);
+        pos1 = mtv_type::advance_position(pos1, -10);
+        pos2 = db.position(0);
+        assert(pos1 == pos2);
+
+        // A position more than one past the last valid position is considered out-of-range.
+
+        try
+        {
+            pos1 = db.position(11);
+            assert(!"No exceptions thrown, but one was expected to be thrown.");
+        }
+        catch (const std::out_of_range&)
+        {
+            // good.
+            cout << "Out of range exception was thrown as expected." << endl;
+        }
+        catch (...)
+        {
+            assert(!"An unexpected exception was thrown.");
+        }
+
+        // Try again with the variant that takes a position hint.
+
+        try
+        {
+            pos1 = db.position(db.begin(), 11);
+            assert(!"No exceptions thrown, but one was expected to be thrown.");
+        }
+        catch (const std::out_of_range&)
+        {
+            // good.
+            cout << "Out of range exception was thrown as expected." << endl;
+        }
+        catch (...)
+        {
+            assert(!"An unexpected exception was thrown.");
+        }
+    };
+
+    mtv_type db(10);
+    const mtv_type& cdb = db;
+    cout << "* position_type" << endl;
+    run(db);
+    cout << "* const_position_type" << endl;
+    run(cdb);
+}
+
+/**
+ * Ensure that we test block adjustment case with adjusted block size
+ * greater than 8.
+ */
+void mtv_test_misc_block_pos_adjustments()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db(1);
+
+    for (int i = 0; i < 20; ++i)
+    {
+        std::vector<double> vs(2, 1.1);
+        db.insert(0, vs.begin(), vs.end());
+
+        std::vector<int16_t> is(2, 34);
+        db.insert(0, is.begin(), is.end());
+    }
+
+    assert(db.size() == 81);
+    assert(db.block_size() == 41);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/position.inl b/test/multi_type_vector/default/tc/position.inl
new file mode 100644
index 0000000..6c7d819
--- /dev/null
+++ b/test/multi_type_vector/default/tc/position.inl
@@ -0,0 +1,202 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_position()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(10, false);
+    mtv_type::iterator check;
+    mtv_type::const_iterator const_check;
+    db.set(6, 1.1);
+    db.set(7, 1.2);
+    db.set(8, 1.3);
+    db.set(9, 1.4);
+
+    mtv_type::position_type pos = db.position(0);
+    assert(pos.first == db.begin());
+    assert(pos.second == 0);
+
+    pos = db.position(1);
+    assert(pos.first == db.begin());
+    assert(pos.second == 1);
+
+    pos = db.position(5);
+    assert(pos.first == db.begin());
+    assert(pos.second == 5);
+
+    check = db.begin();
+    ++check;
+
+    // These positions should be on the 2nd block.
+
+    pos = db.position(6);
+    assert(pos.first == check);
+    assert(pos.second == 0);
+
+    pos = db.position(7);
+    assert(pos.first == check);
+    assert(pos.second == 1);
+
+    pos = db.position(9);
+    assert(pos.first == check);
+    assert(pos.second == 3);
+
+    {
+        // Make sure you get the right element.
+        mtv_type::iterator it = pos.first;
+        assert(it->type == mdds::mtv::element_type_double);
+        assert(it->data);
+        mdds::mtv::double_element_block::iterator it_elem = mdds::mtv::double_element_block::begin(*it->data);
+        advance(it_elem, pos.second);
+        assert(*it_elem == 1.4);
+    }
+
+    // Quick check for the const variant.
+    const mtv_type& db_ref = db;
+    mtv_type::const_position_type const_pos = db_ref.position(3);
+    assert(const_pos.first == db_ref.begin());
+    assert(const_pos.second == 3);
+    const_pos = db_ref.position(const_pos.first, 7);
+    const_check = db_ref.begin();
+    ++const_check;
+    assert(const_pos.first == const_check);
+    assert(const_pos.second == 1);
+
+    // Check for the variant that takes position hint.
+    pos = db.position(0);
+    assert(pos.first == db.begin());
+    assert(pos.second == 0);
+
+    pos = db.position(pos.first, 6);
+    check = db.begin();
+    ++check;
+    assert(pos.first == check);
+    assert(pos.second == 0);
+
+    pos = db.position(pos.first, 7);
+    assert(pos.first == check);
+    assert(pos.second == 1);
+
+    pos = db.position(pos.first, 9);
+    assert(pos.first == check);
+    assert(pos.second == 3);
+}
+
+void mtv_test_position_next()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(10);
+    db.set(2, 1.1);
+    db.set(3, 1.2);
+    db.set(4, std::string("A"));
+    db.set(5, std::string("B"));
+    db.set(6, std::string("C"));
+    db.set(7, true);
+    db.set(8, false);
+
+    mtv_type::position_type pos = db.position(0);
+    assert(mtv_type::logical_position(pos) == 0);
+    assert(pos.first->type == mdds::mtv::element_type_empty);
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 1);
+    assert(pos.first->type == mdds::mtv::element_type_empty);
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 2);
+    assert(pos.first->type == mdds::mtv::element_type_double);
+    assert(mtv_type::get<mdds::mtv::double_element_block>(pos) == 1.1);
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 3);
+    assert(pos.first->type == mdds::mtv::element_type_double);
+    assert(mtv_type::get<mdds::mtv::double_element_block>(pos) == 1.2);
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 4);
+    assert(pos.first->type == mdds::mtv::element_type_string);
+    assert(mtv_type::get<mdds::mtv::string_element_block>(pos) == "A");
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 5);
+    assert(pos.first->type == mdds::mtv::element_type_string);
+    assert(mtv_type::get<mdds::mtv::string_element_block>(pos) == "B");
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 6);
+    assert(pos.first->type == mdds::mtv::element_type_string);
+    assert(mtv_type::get<mdds::mtv::string_element_block>(pos) == "C");
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 7);
+    assert(pos.first->type == mdds::mtv::element_type_boolean);
+    assert(mtv_type::get<mdds::mtv::boolean_element_block>(pos) == true);
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 8);
+    assert(pos.first->type == mdds::mtv::element_type_boolean);
+    assert(mtv_type::get<mdds::mtv::boolean_element_block>(pos) == false);
+
+    pos = mtv_type::next_position(pos);
+    assert(mtv_type::logical_position(pos) == 9);
+    assert(pos.first->type == mdds::mtv::element_type_empty);
+
+    pos = mtv_type::next_position(pos);
+    assert(pos.first == db.end());
+}
+
+void mtv_test_position_advance()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db(10);
+    db.set(2, 1.1);
+    db.set(3, 1.2);
+    db.set(4, std::string("A"));
+    db.set(5, std::string("B"));
+    db.set(6, std::string("C"));
+
+    mtv_type::position_type pos = db.position(0);
+    assert(mtv_type::logical_position(pos) == 0);
+
+    pos = mtv_type::advance_position(pos, 4);
+    assert(mtv_type::logical_position(pos) == 4);
+
+    pos = mtv_type::advance_position(pos, 5);
+    assert(mtv_type::logical_position(pos) == 9);
+
+    pos = mtv_type::advance_position(pos, -3);
+    assert(mtv_type::logical_position(pos) == 6);
+
+    pos = mtv_type::advance_position(pos, -6);
+    assert(mtv_type::logical_position(pos) == 0);
+
+    pos = mtv_type::advance_position(pos, 10);
+    assert(pos.first == db.end());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/set.inl b/test/multi_type_vector/default/tc/set.inl
new file mode 100644
index 0000000..5e11bda
--- /dev/null
+++ b/test/multi_type_vector/default/tc/set.inl
@@ -0,0 +1,652 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_set_cells()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    {
+        mtv_type db(5);
+
+        // Replace the whole block.
+
+        {
+            std::vector<double> vals;
+            vals.reserve(5);
+            for (size_t i = 0; i < db.size(); ++i)
+                vals.push_back(double(i + 1));
+
+            db.set(0, vals.begin(), vals.end());
+
+            double test;
+            db.get(0, test);
+            assert(test == 1.0);
+            db.get(4, test);
+            assert(test == 5.0);
+        }
+
+        {
+            std::vector<std::string> vals;
+            vals.reserve(5);
+            for (size_t i = 0; i < db.size(); ++i)
+            {
+                std::ostringstream os;
+                os << (i + 1);
+                vals.push_back(os.str());
+            }
+
+            db.set(0, vals.begin(), vals.end());
+
+            std::string test;
+            db.get(0, test);
+            assert(test == "1");
+            db.get(4, test);
+            assert(test == "5");
+        }
+
+        {
+            double vals[] = {5.0, 6.0, 7.0, 8.0, 9.0};
+            double* p = &vals[0];
+            double* p_end = p + 5;
+            db.set(0, p, p_end);
+            double test;
+            db.get(0, test);
+            assert(test == 5.0);
+            db.get(4, test);
+            assert(test == 9.0);
+        }
+
+        {
+            // Replace the whole block of the same type, which shouldn't
+            // delete the old data array.
+            double vals[] = {5.1, 6.1, 7.1, 8.1, 9.1};
+            double* p = &vals[0];
+            double* p_end = p + 5;
+            db.set(0, p, p_end);
+            double test;
+            db.get(0, test);
+            assert(test == 5.1);
+            db.get(4, test);
+            assert(test == 9.1);
+
+            double vals2[] = {8.2, 9.2};
+            p = &vals2[0];
+            p_end = p + 2;
+            db.set(3, p, p_end);
+            db.get(3, test);
+            assert(test == 8.2);
+            db.get(4, test);
+            assert(test == 9.2);
+        }
+
+        {
+            // Replace the upper part of a single block.
+            uint64_t vals[] = {1, 2, 3};
+            uint64_t* p = &vals[0];
+            uint64_t* p_end = p + 3;
+            db.set(0, p, p_end);
+            assert(db.block_size() == 2);
+            assert(db.size() == 5);
+            uint64_t test;
+            db.get(0, test);
+            assert(test == 1);
+            db.get(2, test);
+            assert(test == 3);
+            double test2;
+            db.get(3, test2);
+            assert(test2 == 8.2);
+        }
+
+        {
+            // Merge with the previos block and erase the whole block.
+            uint64_t vals[] = {4, 5};
+            uint64_t* p = &vals[0];
+            uint64_t* p_end = p + 2;
+            db.set(3, p, p_end);
+            assert(db.block_size() == 1);
+            assert(db.size() == 5);
+            uint64_t test;
+            db.get(2, test);
+            assert(test == 3);
+            db.get(3, test);
+            assert(test == 4);
+        }
+
+        {
+            // Merge with the previous block while keeping the lower part of
+            // the block.
+            uint64_t prev_value;
+            db.get(2, prev_value);
+
+            double val = 2.3;
+            db.set(0, val);
+            assert(db.block_size() == 2);
+            val = 4.5;
+            double* p = &val;
+            double* p_end = p + 1;
+            db.set(1, p, p_end);
+            assert(db.block_size() == 2);
+            assert(db.size() == 5);
+            {
+                double test;
+                db.get(0, test);
+                assert(test == 2.3);
+                db.get(1, test);
+                assert(test == 4.5);
+            }
+
+            uint64_t test;
+            db.get(2, test);
+            assert(test == prev_value);
+        }
+    }
+
+    {
+        mtv_type db(5);
+        for (size_t i = 0; i < 5; ++i)
+            db.set(i, static_cast<double>(i + 1));
+
+        assert(db.block_size() == 1);
+        assert(db.size() == 5);
+
+        {
+            uint64_t vals[] = {10, 11};
+            uint64_t* p = &vals[0];
+            uint64_t* p_end = p + 2;
+            db.set(3, p, p_end);
+
+            assert(db.block_size() == 2);
+            assert(db.size() == 5);
+
+            double test;
+            db.get(2, test);
+            assert(test == 3.0);
+            uint64_t test2;
+            db.get(3, test2);
+            assert(test2 == 10);
+            db.get(4, test2);
+            assert(test2 == 11);
+
+            // Insertion into a single block but this time it needs to be
+            // merged with the subsequent block.
+            db.set(1, p, p_end);
+
+            assert(db.block_size() == 2);
+            assert(db.size() == 5);
+
+            db.get(1, test2);
+            assert(test2 == 10);
+            db.get(2, test2);
+            assert(test2 == 11);
+            db.get(3, test2);
+            assert(test2 == 10);
+            db.get(4, test2);
+            assert(test2 == 11);
+        }
+    }
+
+    {
+        mtv_type db(6);
+        double vals_d[] = {1.0, 1.1, 1.2, 1.3, 1.4, 1.5};
+        uint64_t vals_i[] = {12, 13, 14, 15};
+        std::string vals_s[] = {"a", "b"};
+
+        {
+            double* p = &vals_d[0];
+            double* p_end = p + 6;
+            db.set(0, p, p_end);
+            assert(db.block_size() == 1);
+            assert(db.size() == 6);
+            double test;
+            db.get(0, test);
+            assert(test == 1.0);
+            db.get(5, test);
+            assert(test == 1.5);
+        }
+
+        {
+            uint64_t* p = &vals_i[0];
+            uint64_t* p_end = p + 4;
+            db.set(0, p, p_end);
+            assert(db.block_size() == 2);
+            uint64_t test;
+            db.get(0, test);
+            assert(test == 12);
+            db.get(3, test);
+            assert(test == 15);
+        }
+
+        {
+            std::string* p = &vals_s[0];
+            std::string* p_end = p + 2;
+            db.set(2, p, p_end);
+            assert(db.block_size() == 3);
+            std::string test;
+            db.get(2, test);
+            assert(test == "a");
+            db.get(3, test);
+            assert(test == "b");
+            double test_d;
+            db.get(4, test_d);
+            assert(test_d == 1.4);
+            uint64_t test_i;
+            db.get(1, test_i);
+            assert(test_i == 13);
+        }
+    }
+
+    {
+        mtv_type db(3);
+        {
+            double vals[] = {2.1, 2.2, 2.3};
+            double* p = &vals[0];
+            double* p_end = p + 3;
+            db.set(0, p, p_end);
+            assert(db.block_size() == 1);
+        }
+
+        {
+            uint64_t val_i = 23;
+            uint64_t* p = &val_i;
+            uint64_t* p_end = p + 1;
+            db.set(1, p, p_end);
+            assert(db.block_size() == 3);
+            uint64_t test;
+            db.get(1, test);
+            assert(test == 23);
+            double test_d;
+            db.get(0, test_d);
+            assert(test_d == 2.1);
+            db.get(2, test_d);
+            assert(test_d == 2.3);
+        }
+    }
+
+    {
+        // Set cells over multiple blocks. Very simple case.
+
+        mtv_type db(2);
+        db.set(0, static_cast<double>(1.1));
+        db.set(1, std::string("foo"));
+        assert(db.block_size() == 2);
+
+        double vals[] = {2.1, 2.2};
+        double* p = &vals[0];
+        double* p_end = p + 2;
+        db.set(0, p, p_end);
+        assert(db.block_size() == 1);
+        assert(db.size() == 2);
+
+        double test;
+        db.get(0, test);
+        assert(test == 2.1);
+        db.get(1, test);
+        assert(test == 2.2);
+    }
+
+    {
+        // Same as above, except that the last block is only partially replaced.
+
+        mtv_type db(3);
+        db.set(0, static_cast<double>(1.1));
+        db.set(1, std::string("foo"));
+        db.set(2, std::string("baa"));
+
+        double vals[] = {2.1, 2.2};
+        double* p = &vals[0];
+        double* p_end = p + 2;
+        db.set(0, p, p_end);
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+
+        double test_val;
+        db.get(0, test_val);
+        assert(test_val == 2.1);
+        db.get(1, test_val);
+        assert(test_val == 2.2);
+
+        std::string test_s;
+        db.get(2, test_s);
+        assert(test_s == "baa");
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, static_cast<double>(3.1));
+        db.set(1, static_cast<double>(3.2));
+        db.set(2, std::string("foo"));
+        assert(db.block_size() == 2);
+        assert(db.size() == 3);
+
+        double vals[] = {2.1, 2.2};
+        double* p = &vals[0];
+        double* p_end = p + 2;
+        db.set(1, p, p_end);
+        assert(db.block_size() == 1);
+        double test;
+        db.get(0, test);
+        assert(test == 3.1);
+        db.get(1, test);
+        assert(test == 2.1);
+        db.get(2, test);
+        assert(test == 2.2);
+    }
+
+    {
+        mtv_type db(5);
+        db.set(0, 1.1);
+        db.set(1, 1.2);
+        db.set(2, std::string("foo"));
+        db.set(3, 1.3);
+        db.set(4, 1.4);
+        assert(db.block_size() == 3);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        double* p_end = p + 3;
+        db.set(1, p, p_end);
+        assert(db.block_size() == 1);
+        assert(db.size() == 5);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+        assert(db.get<double>(4) == 1.4);
+    }
+
+    {
+        mtv_type db(4);
+        db.set(0, std::string("A"));
+        db.set(1, std::string("B"));
+        db.set(2, 1.1);
+        db.set(3, 1.2);
+        assert(db.block_size() == 2);
+
+        double vals[] = {2.1, 2.2, 2.3};
+        double* p = &vals[0];
+        db.set(1, p, p + 3);
+        assert(db.block_size() == 2);
+        assert(db.get<std::string>(0) == std::string("A"));
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 2.3);
+    }
+
+    {
+        mtv_type db(4);
+        db.set(0, std::string("A"));
+        db.set(1, std::string("B"));
+        db.set(2, 1.1);
+        db.set(3, 1.2);
+        assert(db.block_size() == 2);
+
+        double vals[] = {2.1, 2.2};
+        double* p = &vals[0];
+        db.set(1, p, p + 2);
+        assert(db.block_size() == 2);
+        assert(db.get<std::string>(0) == std::string("A"));
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+        assert(db.get<double>(3) == 1.2);
+    }
+
+    {
+        mtv_type db(5);
+        db.set(0, std::string("A"));
+        db.set(1, std::string("B"));
+        db.set(2, 1.1);
+        db.set(3, 1.2);
+        db.set(4, static_cast<uint64_t>(12));
+        assert(db.block_size() == 3);
+
+        uint64_t vals[] = {21, 22, 23};
+        uint64_t* p = &vals[0];
+        db.set(1, p, p + 3);
+        assert(db.block_size() == 2);
+        assert(db.get<std::string>(0) == std::string("A"));
+        assert(db.get<uint64_t>(1) == 21);
+        assert(db.get<uint64_t>(2) == 22);
+        assert(db.get<uint64_t>(3) == 23);
+        assert(db.get<uint64_t>(4) == 12);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, std::string("A"));
+        db.set(1, 1.1);
+        db.set(2, 1.2);
+        assert(db.block_size() == 2);
+
+        uint64_t vals[] = {11, 12};
+        uint64_t* p = &vals[0];
+        db.set(0, p, p + 2);
+        assert(db.block_size() == 2);
+        assert(db.get<uint64_t>(0) == 11);
+        assert(db.get<uint64_t>(1) == 12);
+        assert(db.get<double>(2) == 1.2);
+    }
+
+    {
+        mtv_type db(4);
+        db.set(0, static_cast<uint64_t>(35));
+        db.set(1, std::string("A"));
+        db.set(2, 1.1);
+        db.set(3, 1.2);
+        assert(db.block_size() == 3);
+
+        uint64_t vals[] = {11, 12};
+        uint64_t* p = &vals[0];
+        db.set(1, p, p + 2);
+        assert(db.block_size() == 2);
+        assert(db.get<uint64_t>(0) == 35);
+        assert(db.get<uint64_t>(1) == 11);
+        assert(db.get<uint64_t>(2) == 12);
+        assert(db.get<double>(3) == 1.2);
+    }
+
+    {
+        // Block 1 is empty.
+
+        mtv_type db(2);
+        db.set(1, 1.2);
+        assert(db.block_size() == 2);
+
+        double vals[] = {2.1, 2.2};
+        double* p = &vals[0];
+        db.set(0, p, p + 2);
+        assert(db.block_size() == 1);
+        assert(db.get<double>(0) == 2.1);
+        assert(db.get<double>(1) == 2.2);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, 1.1);
+        db.set(2, 1.2);
+        assert(db.block_size() == 3);
+
+        double vals[] = {2.1, 2.2};
+        double* p = &vals[0];
+        db.set(1, p, p + 2);
+        assert(db.block_size() == 1);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<double>(1) == 2.1);
+        assert(db.get<double>(2) == 2.2);
+    }
+
+    {
+        mtv_type db(5);
+        db.set(2, std::string("A"));
+        db.set(3, std::string("B"));
+        db.set(4, std::string("C"));
+        assert(db.block_size() == 2);
+
+        double vals[] = {1.1, 1.2, 1.3};
+        double* p = &vals[0];
+        db.set(1, p, p + 3);
+        assert(db.block_size() == 3);
+
+        assert(db.is_empty(0));
+        assert(db.get<double>(1) == 1.1);
+        assert(db.get<double>(2) == 1.2);
+        assert(db.get<double>(3) == 1.3);
+        assert(db.get<std::string>(4) == std::string("C"));
+    }
+
+    {
+        mtv_type db(10, true);
+        std::vector<bool> bools(3, false);
+        db.set(3, 1.1);
+        db.set(4, 1.2);
+        db.set(5, 1.3);
+        assert(db.block_size() == 3);
+
+        // This should replace the middle numeric block and merge with the top
+        // and bottom ones.
+        db.set(3, bools.begin(), bools.end());
+        assert(db.block_size() == 1);
+        assert(db.size() == 10);
+        assert(db.get<bool>(0) == true);
+        assert(db.get<bool>(1) == true);
+        assert(db.get<bool>(2) == true);
+        assert(db.get<bool>(3) == false);
+        assert(db.get<bool>(4) == false);
+        assert(db.get<bool>(5) == false);
+        assert(db.get<bool>(6) == true);
+        assert(db.get<bool>(7) == true);
+        assert(db.get<bool>(8) == true);
+        assert(db.get<bool>(9) == true);
+    }
+
+    {
+        mtv_type db(9);
+        db.set(0, 1.1);
+        db.set(1, 1.2);
+        db.set(2, true);
+        db.set(3, false);
+        db.set(4, true);
+        db.set(5, std::string("a"));
+        db.set(6, std::string("b"));
+        db.set(7, std::string("c"));
+        db.set(8, std::string("d"));
+        assert(db.block_size() == 3);
+
+        std::vector<std::string> strings(3, std::string("foo"));
+        db.set(2, strings.begin(), strings.end()); // Merge with the next block.
+        assert(db.block_size() == 2);
+        assert(db.size() == 9);
+        assert(db.get<double>(0) == 1.1);
+        assert(db.get<double>(1) == 1.2);
+        assert(db.get<std::string>(2) == "foo");
+        assert(db.get<std::string>(3) == "foo");
+        assert(db.get<std::string>(4) == "foo");
+        assert(db.get<std::string>(5) == "a");
+        assert(db.get<std::string>(6) == "b");
+        assert(db.get<std::string>(7) == "c");
+        assert(db.get<std::string>(8) == "d");
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<int16_t>(i);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back<double>(i);
+
+        for (int i = 0; i < 3; ++i)
+            db.push_back_empty();
+
+        std::vector<int16_t> data(5, 11);
+        db.set(2, data.begin(), data.end());
+
+        assert(db.block_size() == 2);
+        assert(db.size() == 9);
+        assert(db.get<int16_t>(0) == 0);
+        assert(db.get<int16_t>(1) == 1);
+        assert(db.get<int16_t>(2) == 11);
+        assert(db.get<int16_t>(3) == 11);
+        assert(db.get<int16_t>(4) == 11);
+        assert(db.get<int16_t>(5) == 11);
+        assert(db.get<int16_t>(6) == 11);
+        assert(db.is_empty(7));
+        assert(db.is_empty(8));
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 2; ++i)
+            db.push_back<int16_t>(i);
+
+        for (int i = 0; i < 2; ++i)
+            db.push_back<double>(i);
+
+        for (int i = 0; i < 2; ++i)
+            db.push_back<int64_t>(i + 20);
+
+        std::vector<int32_t> data(3, 15);
+        db.set(2, data.begin(), data.end());
+
+        assert(db.block_size() == 3);
+        assert(db.size() == 6);
+        assert(db.get<int16_t>(0) == 0);
+        assert(db.get<int16_t>(1) == 1);
+        assert(db.get<int32_t>(2) == 15);
+        assert(db.get<int32_t>(3) == 15);
+        assert(db.get<int32_t>(4) == 15);
+        assert(db.get<int64_t>(5) == 21);
+    }
+
+    {
+        mtv_type db;
+
+        for (int i = 0; i < 2; ++i)
+            db.push_back<int16_t>(i);
+
+        for (int i = 0; i < 2; ++i)
+            db.push_back<double>(i);
+
+        for (int i = 0; i < 2; ++i)
+            db.push_back<int64_t>(i + 20);
+
+        std::vector<int32_t> data(3, 15);
+        db.set(1, data.begin(), data.end());
+
+        assert(db.block_size() == 3);
+        assert(db.size() == 6);
+        assert(db.get<int16_t>(0) == 0);
+        assert(db.get<int32_t>(1) == 15);
+        assert(db.get<int32_t>(2) == 15);
+        assert(db.get<int32_t>(3) == 15);
+        assert(db.get<int64_t>(4) == 20);
+        assert(db.get<int64_t>(5) == 21);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/swap_range.inl b/test/multi_type_vector/default/tc/swap_range.inl
new file mode 100644
index 0000000..8736488
--- /dev/null
+++ b/test/multi_type_vector/default/tc/swap_range.inl
@@ -0,0 +1,551 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_swap_range()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db1(10), db2(10);
+    db1.set(2, 1.1);
+    db1.set(3, 1.2);
+    db1.set(4, 1.3);
+
+    db2.set(2, 2.1);
+    db2.set(3, 2.2);
+    db2.set(4, 2.3);
+
+    db1.swap(2, 4, db2, 2);
+    assert(db1.get<double>(2) == 2.1);
+    assert(db1.get<double>(3) == 2.2);
+    assert(db1.get<double>(4) == 2.3);
+    assert(db2.get<double>(2) == 1.1);
+    assert(db2.get<double>(3) == 1.2);
+    assert(db2.get<double>(4) == 1.3);
+
+    // Source is empty but destination is not.
+    db1 = mtv_type(3);
+    db2 = mtv_type(3, 12.3);
+    db1.swap(1, 2, db2, 1);
+    assert(db1.is_empty(0));
+    assert(db1.get<double>(1) == 12.3);
+    assert(db1.get<double>(2) == 12.3);
+    assert(db1.block_size() == 2);
+    assert(db2.get<double>(0) == 12.3);
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.block_size() == 2);
+
+    // Go to the opposite direction.
+    db1.swap(1, 2, db2, 1);
+    assert(db1.block_size() == 1);
+    mtv_type::iterator it = db1.begin();
+    assert(it->type == mdds::mtv::element_type_empty);
+    assert(it->size == 3);
+    it = db2.begin();
+    assert(it->type == mdds::mtv::element_type_double);
+    assert(it->size == 3);
+
+    int32_t int_val = 2;
+    int16_t short_val = 5;
+    db1 = mtv_type(5, int_val);
+    db2 = mtv_type(5, short_val);
+    db1.set(1, 2.3);
+    db1.set(2, 2.4);
+    db2.set(3, std::string("abc"));
+    db2.set(4, std::string("def"));
+    db1.swap(1, 2, db2, 3); // Swap 1-2 of source with 3-4 of destination.
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<std::string>(1) == "abc");
+    assert(db1.get<std::string>(2) == "def");
+    assert(db1.get<int32_t>(3) == int_val);
+    assert(db1.get<int32_t>(4) == int_val);
+    assert(db1.block_size() == 3);
+
+    assert(db2.get<int16_t>(0) == short_val);
+    assert(db2.get<int16_t>(1) == short_val);
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<double>(3) == 2.3);
+    assert(db2.get<double>(4) == 2.4);
+    assert(db2.block_size() == 2);
+
+    // Merge with the next block in the destination.
+    db1 = mtv_type(5, int_val);
+    db2 = mtv_type(5, 12.3);
+    db2.set(0, std::string("A"));
+    db2.set(1, std::string("B"));
+    db1.set(3, 1.1);
+    db1.set(4, 1.2);
+    db1.swap(3, 4, db2, 0);
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<std::string>(3) == "A");
+    assert(db1.get<std::string>(4) == "B");
+    assert(db1.block_size() == 2);
+
+    assert(db2.get<double>(0) == 1.1);
+    assert(db2.get<double>(1) == 1.2);
+    assert(db2.get<double>(2) == 12.3);
+    assert(db2.get<double>(3) == 12.3);
+    assert(db2.get<double>(4) == 12.3);
+    assert(db2.block_size() == 1);
+
+    // Merge with the previous block in the destination.
+    db1 = mtv_type(5, int_val);
+    db1.set(2, std::string("A"));
+    db1.set(3, std::string("B"));
+
+    db2 = mtv_type(5, std::string("default"));
+    db2.set(3, short_val);
+    db2.set(4, short_val);
+
+    db1.swap(2, 3, db2, 3);
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int16_t>(2) == short_val);
+    assert(db1.get<int16_t>(3) == short_val);
+    assert(db1.get<int32_t>(4) == int_val);
+    assert(db1.block_size() == 3);
+
+    assert(db2.get<std::string>(0) == "default");
+    assert(db2.get<std::string>(1) == "default");
+    assert(db2.get<std::string>(2) == "default");
+    assert(db2.get<std::string>(3) == "A");
+    assert(db2.get<std::string>(4) == "B");
+    assert(db2.block_size() == 1);
+
+    // Merge with both the previous and next blocks in the destination.
+    db1 = mtv_type(5, int_val);
+    db1.set(2, std::string("C"));
+    db1.set(3, std::string("D"));
+
+    db2 = mtv_type(6, std::string("default"));
+    db2.set(3, short_val);
+    db2.set(4, short_val);
+
+    db1.swap(2, 3, db2, 3);
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int16_t>(2) == short_val);
+    assert(db1.get<int16_t>(3) == short_val);
+    assert(db1.get<int32_t>(4) == int_val);
+    assert(db1.block_size() == 3);
+
+    assert(db2.get<std::string>(0) == "default");
+    assert(db2.get<std::string>(1) == "default");
+    assert(db2.get<std::string>(2) == "default");
+    assert(db2.get<std::string>(3) == "C");
+    assert(db2.get<std::string>(4) == "D");
+    assert(db2.get<std::string>(5) == "default");
+    assert(db2.block_size() == 1);
+
+    // Set the new elements to the top of a block in the destination.
+    db1 = mtv_type(5, int_val);
+    db1.set(3, std::string("E"));
+    db1.set(4, std::string("F"));
+    db2 = mtv_type(5, short_val);
+    db1.swap(3, 4, db2, 0);
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<int16_t>(3) == short_val);
+    assert(db1.get<int16_t>(4) == short_val);
+    assert(db1.block_size() == 2);
+    assert(db2.get<std::string>(0) == "E");
+    assert(db2.get<std::string>(1) == "F");
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<int16_t>(3) == short_val);
+    assert(db2.get<int16_t>(4) == short_val);
+    assert(db2.block_size() == 2);
+
+    // Do the same as before, but merge with the previous block.
+    db1 = mtv_type(5, int_val);
+    db1.set(3, std::string("G"));
+    db1.set(4, std::string("H"));
+    db2 = mtv_type(5, short_val);
+    db2.set(0, std::string("F"));
+    db1.swap(3, 4, db2, 1);
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<int16_t>(3) == short_val);
+    assert(db1.get<int16_t>(4) == short_val);
+    assert(db1.block_size() == 2);
+    assert(db2.get<std::string>(0) == "F");
+    assert(db2.get<std::string>(1) == "G");
+    assert(db2.get<std::string>(2) == "H");
+    assert(db2.get<int16_t>(3) == short_val);
+    assert(db2.get<int16_t>(4) == short_val);
+    assert(db2.block_size() == 2);
+
+    // Set the new element to the middle of a destination block.
+    db1 = mtv_type(5, int_val);
+    db1.set(3, std::string("I"));
+    db1.set(4, std::string("J"));
+    db2 = mtv_type(5, short_val);
+    db2.set(0, std::string("top"));
+    db1.swap(3, 4, db2, 2);
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<int16_t>(3) == short_val);
+    assert(db1.get<int16_t>(4) == short_val);
+    assert(db1.block_size() == 2);
+
+    assert(db2.get<std::string>(0) == "top");
+    assert(db2.get<int16_t>(1) == short_val);
+    assert(db2.get<std::string>(2) == "I");
+    assert(db2.get<std::string>(3) == "J");
+    assert(db2.get<int16_t>(4) == short_val);
+    assert(db2.block_size() == 4);
+
+    // Set the new element to the lower part of a destination block.
+    db1 = mtv_type(5, int_val);
+    db1.set(0, std::string("A1"));
+    db1.set(1, std::string("A2"));
+    db2 = mtv_type(5, short_val);
+    db1.swap(0, 1, db2, 3);
+
+    assert(db1.get<int16_t>(0) == short_val);
+    assert(db1.get<int16_t>(1) == short_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<int32_t>(3) == int_val);
+    assert(db1.get<int32_t>(4) == int_val);
+    assert(db1.block_size() == 2);
+
+    assert(db2.get<int16_t>(0) == short_val);
+    assert(db2.get<int16_t>(1) == short_val);
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<std::string>(3) == "A1");
+    assert(db2.get<std::string>(4) == "A2");
+    assert(db2.block_size() == 2);
+
+    // Same as above, except that the new element will be merged with the next
+    // block in the destination.
+    db1 = mtv_type(5, int_val);
+    db1.set(0, std::string("A1"));
+    db1.set(1, std::string("A2"));
+    db2 = mtv_type(6, short_val);
+    db2.set(5, std::string("A3"));
+    db1.swap(0, 1, db2, 3);
+
+    assert(db1.get<int16_t>(0) == short_val);
+    assert(db1.get<int16_t>(1) == short_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<int32_t>(3) == int_val);
+    assert(db1.get<int32_t>(4) == int_val);
+    assert(db1.block_size() == 2);
+
+    assert(db2.get<int16_t>(0) == short_val);
+    assert(db2.get<int16_t>(1) == short_val);
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<std::string>(3) == "A1");
+    assert(db2.get<std::string>(4) == "A2");
+    assert(db2.get<std::string>(5) == "A3");
+    assert(db2.block_size() == 2);
+
+    // Swap the top part of source block.
+    db1 = mtv_type(5, int_val);
+    db2 = mtv_type(5, short_val);
+    db1.swap(0, 1, db2, 0);
+
+    assert(db1.get<int16_t>(0) == short_val);
+    assert(db1.get<int16_t>(1) == short_val);
+    assert(db1.get<int32_t>(2) == int_val);
+    assert(db1.get<int32_t>(3) == int_val);
+    assert(db1.get<int32_t>(4) == int_val);
+
+    assert(db2.get<int32_t>(0) == int_val);
+    assert(db2.get<int32_t>(1) == int_val);
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<int16_t>(3) == short_val);
+    assert(db2.get<int16_t>(4) == short_val);
+
+    // Do the same, and merge with the previous block in the source.
+    db1 = mtv_type(5, int_val);
+    db1.set(0, std::string("A"));
+    db2 = mtv_type(5, short_val);
+    db2.set(0, std::string("B"));
+    db2.set(1, std::string("C"));
+    db1.swap(1, 2, db2, 0);
+
+    assert(db1.get<std::string>(0) == "A");
+    assert(db1.get<std::string>(1) == "B");
+    assert(db1.get<std::string>(2) == "C");
+    assert(db1.get<int32_t>(3) == int_val);
+    assert(db1.get<int32_t>(4) == int_val);
+    assert(db1.block_size() == 2);
+
+    assert(db2.get<int32_t>(0) == int_val);
+    assert(db2.get<int32_t>(1) == int_val);
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<int16_t>(3) == short_val);
+    assert(db2.get<int16_t>(4) == short_val);
+    assert(db2.block_size() == 2);
+
+    // Replace the bottom part of existing source block.
+    db1 = mtv_type(2, true);
+    db2 = mtv_type(1, int_val);
+    db1.swap(1, 1, db2, 0);
+    assert(db1.get<bool>(0) == true);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db2.get<bool>(0) == true);
+
+    // Do the same, but merge with the next block in the source.
+    db1 = mtv_type(3, true);
+    db1.set<int32_t>(2, int_val + 1);
+    db2 = mtv_type(1, int_val);
+    db1.swap(1, 1, db2, 0);
+    assert(db1.get<bool>(0) == true);
+    assert(db1.get<int32_t>(1) == int_val);
+    assert(db1.get<int32_t>(2) == int_val + 1);
+    assert(db2.get<bool>(0) == true);
+
+    // Replace the middle of existing source block.
+    db1 = mtv_type(5);
+    db1.set<int8_t>(0, 'a');
+    db1.set<int8_t>(1, 'b');
+    db1.set<int8_t>(2, 'c');
+    db1.set<int8_t>(3, 'd');
+    db1.set<int8_t>(4, 'e');
+    db2 = mtv_type(2);
+    db2.set(0, 1.1);
+    db2.set(1, -1.1);
+    db1.swap(2, 3, db2, 0);
+    assert(db1.get<int8_t>(0) == 'a');
+    assert(db1.get<int8_t>(1) == 'b');
+    assert(db1.get<double>(2) == 1.1);
+    assert(db1.get<double>(3) == -1.1);
+    assert(db1.get<int8_t>(4) == 'e');
+    assert(db1.block_size() == 3);
+
+    assert(db2.get<int8_t>(0) == 'c');
+    assert(db2.get<int8_t>(1) == 'd');
+    assert(db2.block_size() == 1);
+
+    // Swap single empty block with multiple destination blocks.
+    db1 = mtv_type(5);
+    db2 = mtv_type(5);
+    db2.set(0, 1.1);
+    db2.set(1, 2.1);
+    db2.set(2, 3.1);
+    db2.set(3, std::string("abc"));
+    db2.set(4, std::string("def"));
+    db1.swap(0, 3, db2, 1);
+    assert(db1.get<double>(0) == 2.1);
+    assert(db1.get<double>(1) == 3.1);
+    assert(db1.get<std::string>(2) == "abc");
+    assert(db1.get<std::string>(3) == "def");
+    assert(db1.is_empty(4));
+    assert(db1.block_size() == 3);
+    assert(db2.get<double>(0) == 1.1);
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+    assert(db2.block_size() == 2);
+
+    // Swap non-empty single block with multiple destination blocks.
+    db1 = mtv_type(4, int_val);
+    db2 = mtv_type(5);
+    db2.set(0, 1.1);
+    db2.set(1, 2.1);
+    db2.set(2, 3.1);
+    db2.set(3, std::string("abc"));
+    db2.set(4, std::string("def"));
+    db1.swap(0, 3, db2, 1);
+    assert(db1.get<double>(0) == 2.1);
+    assert(db1.get<double>(1) == 3.1);
+    assert(db1.get<std::string>(2) == "abc");
+    assert(db1.get<std::string>(3) == "def");
+    assert(db1.block_size() == 2);
+    assert(db2.get<double>(0) == 1.1);
+    assert(db2.get<int32_t>(1) == int_val);
+    assert(db2.get<int32_t>(2) == int_val);
+    assert(db2.get<int32_t>(3) == int_val);
+    assert(db2.get<int32_t>(4) == int_val);
+    assert(db2.block_size() == 2);
+
+    // Another scenario.
+    db1 = mtv_type(2, short_val);
+    db2 = mtv_type(2);
+    db2.set(0, std::string("A"));
+    db2.set<int8_t>(1, 'A');
+    db1.swap(0, 1, db2, 0);
+    assert(db1.get<std::string>(0) == "A");
+    assert(db1.get<int8_t>(1) == 'A');
+    assert(db2.get<int16_t>(0) == short_val);
+    assert(db2.get<int16_t>(1) == short_val);
+
+    // Another scenario.
+    db1 = mtv_type(2, 3.14);
+    db2 = mtv_type(3);
+    db2.set(0, std::string("abc"));
+    db2.set<uint8_t>(1, 'z');
+    db2.set<uint8_t>(2, 'y');
+    db1.swap(0, 1, db2, 0);
+    assert(db1.get<std::string>(0) == "abc");
+    assert(db1.get<uint8_t>(1) == 'z');
+    assert(db2.get<double>(0) == 3.14);
+    assert(db2.get<double>(1) == 3.14);
+    assert(db2.get<uint8_t>(2) == 'y');
+
+    // Another scenario.
+    db1 = mtv_type(5);
+    db1.set<int32_t>(0, 1);
+    db1.set<int32_t>(1, 2);
+    db1.set<int32_t>(2, 3);
+    db1.set<int32_t>(3, 4);
+    db1.set<int32_t>(4, 5);
+    db2 = mtv_type(3);
+    db2.set(0, 2.3);
+    db2.set<int8_t>(1, 'B');
+    db2.set<int64_t>(2, 123);
+    db1.swap(0, 2, db2, 0);
+    assert(db1.get<double>(0) == 2.3);
+    assert(db1.get<int8_t>(1) == 'B');
+    assert(db1.get<int64_t>(2) == 123);
+    assert(db1.get<int32_t>(3) == 4);
+    assert(db1.get<int32_t>(4) == 5);
+    assert(db2.get<int32_t>(0) == 1);
+    assert(db2.get<int32_t>(1) == 2);
+    assert(db2.get<int32_t>(2) == 3);
+    assert(db2.block_size() == 1);
+
+    // Another one.
+    db1 = mtv_type(3, std::string("test"));
+    db2 = mtv_type(2);
+    db2.set(0, -99.1);
+    db2.set(1, std::string("foo"));
+    db1.swap(1, 2, db2, 0);
+    assert(db1.get<std::string>(0) == "test");
+    assert(db1.get<double>(1) == -99.1);
+    assert(db1.get<std::string>(2) == "foo");
+    assert(db2.get<std::string>(0) == "test");
+    assert(db2.get<std::string>(1) == "test");
+
+    // The source range is in the middle of a block.
+    db1 = mtv_type(8);
+    for (int32_t i = 0; i < 8; ++i)
+        db1.set<int32_t>(i, i + 2);
+    db2 = mtv_type(4);
+    db2.set<int32_t>(0, 12);
+    db2.set<int16_t>(1, 13);
+    db2.set<int64_t>(2, 14);
+    db2.set<double>(3, 15.0);
+    db1.swap(3, 5, db2, 1);
+
+    assert(db1.get<int32_t>(0) == 2);
+    assert(db1.get<int32_t>(1) == 3);
+    assert(db1.get<int32_t>(2) == 4);
+    assert(db1.get<int16_t>(3) == 13);
+    assert(db1.get<int64_t>(4) == 14);
+    assert(db1.get<double>(5) == 15.0);
+    assert(db1.get<int32_t>(6) == 8);
+    assert(db1.get<int32_t>(7) == 9);
+
+    assert(db2.get<int32_t>(0) == 12);
+    assert(db2.get<int32_t>(1) == 5);
+    assert(db2.get<int32_t>(2) == 6);
+    assert(db2.get<int32_t>(3) == 7);
+    assert(db2.block_size() == 1);
+
+    // Try swapping in a multi-to-single block direction.
+    db1 = mtv_type(2);
+    db1.set(0, 1.2);
+    db1.set(1, std::string("123"));
+    db2 = mtv_type(10, short_val);
+    db1.swap(0, 1, db2, 4);
+    assert(db1.get<int16_t>(0) == short_val);
+    assert(db1.get<int16_t>(1) == short_val);
+
+    assert(db2.get<int16_t>(0) == short_val);
+    assert(db2.get<int16_t>(1) == short_val);
+    assert(db2.get<int16_t>(2) == short_val);
+    assert(db2.get<int16_t>(3) == short_val);
+    assert(db2.get<double>(4) == 1.2);
+    assert(db2.get<std::string>(5) == "123");
+    assert(db2.get<int16_t>(6) == short_val);
+    assert(db2.get<int16_t>(7) == short_val);
+    assert(db2.get<int16_t>(8) == short_val);
+    assert(db2.get<int16_t>(9) == short_val);
+
+    // Multi-to-multi block swapping. Very simple case.
+    db1 = mtv_type(2);
+    db1.set(0, 2.1);
+    db1.set(1, std::string("test"));
+    db2 = mtv_type(2);
+    db2.set(0, int_val);
+    db2.set(1, short_val);
+    db1.swap(0, 1, db2, 0);
+
+    assert(db1.get<int32_t>(0) == int_val);
+    assert(db1.get<int16_t>(1) == short_val);
+    assert(db2.get<double>(0) == 2.1);
+    assert(db2.get<std::string>(1) == "test");
+
+    // More complex case.
+    db1 = mtv_type(10);
+    db1.set<int32_t>(0, 2);
+    db1.set<int32_t>(1, 3);
+    db1.set<int32_t>(2, 4);
+    db1.set<std::string>(3, "A");
+    db1.set<std::string>(4, "B");
+    db1.set<std::string>(5, "C");
+    // Leave some empty range.
+    db2 = mtv_type(10);
+    for (int32_t i = 0; i < 10; ++i)
+        db2.set<int32_t>(i, 10 + i);
+    db2.set<int8_t>(5, 'Z');
+    db1.swap(1, 7, db2, 2);
+
+    assert(db1.get<int32_t>(0) == 2);
+    assert(db1.get<int32_t>(1) == 12);
+    assert(db1.get<int32_t>(2) == 13);
+    assert(db1.get<int32_t>(3) == 14);
+    assert(db1.get<int8_t>(4) == 'Z');
+    assert(db1.get<int32_t>(5) == 16);
+    assert(db1.get<int32_t>(6) == 17);
+    assert(db1.get<int32_t>(7) == 18);
+    assert(db1.is_empty(8));
+    assert(db1.is_empty(9));
+    assert(db1.block_size() == 4);
+
+    assert(db2.get<int32_t>(0) == 10);
+    assert(db2.get<int32_t>(1) == 11);
+    assert(db2.get<int32_t>(2) == 3);
+    assert(db2.get<int32_t>(3) == 4);
+    assert(db2.get<std::string>(4) == "A");
+    assert(db2.get<std::string>(5) == "B");
+    assert(db2.get<std::string>(6) == "C");
+    assert(db2.is_empty(7));
+    assert(db2.is_empty(8));
+    assert(db2.get<int32_t>(9) == 19);
+    assert(db2.block_size() == 4);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/default/tc/transfer.inl b/test/multi_type_vector/default/tc/transfer.inl
new file mode 100644
index 0000000..52b9dd5
--- /dev/null
+++ b/test/multi_type_vector/default/tc/transfer.inl
@@ -0,0 +1,391 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void mtv_test_transfer()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+    mtv_type db1(5), db2(5);
+    db1.set(0, 1.0);
+    db1.set(1, 2.0);
+    mtv_type::iterator it = db1.transfer(1, 2, db2, 1);
+
+    assert(db1.get<double>(0) == 1.0);
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+
+    assert(db2.is_empty(0));
+    assert(db2.get<double>(1) == 2.0);
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+
+    assert(it->size == 4);
+    assert(it->__private_data.block_index == 1);
+    assert(it->position == 1);
+
+    // Reset and start over.
+    db1.clear();
+    db1.resize(5);
+    db2.clear();
+    db2.resize(5);
+
+    db1.set(2, 1.2);
+    db1.set(3, 1.3);
+
+    // Transfer 1:2 in db1 to 2:3 in db2.
+    it = db1.transfer(1, 2, db2, 2);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.get<double>(3) == 1.3);
+    assert(db1.is_empty(4));
+
+    assert(db2.is_empty(0));
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.get<double>(3) == 1.2);
+    assert(db2.is_empty(4));
+
+    assert(it->size == 3);
+    assert(it->position == 0);
+    assert(it->__private_data.block_index == 0);
+
+    // Reset and start over.
+    db1.clear();
+    db1.resize(4);
+    db2.clear();
+    db2.resize(4);
+
+    db1.set(0, std::string("A"));
+    db1.set(1, std::string("B"));
+    db1.set(2, 11.1);
+    db1.set(3, 11.2);
+
+    it = db1.transfer(1, 2, db2, 1);
+
+    assert(db1.get<std::string>(0) == "A");
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.get<double>(3) == 11.2);
+
+    assert(db2.is_empty(0));
+    assert(db2.get<std::string>(1) == "B");
+    assert(db2.get<double>(2) == 11.1);
+    assert(db2.is_empty(3));
+
+    assert(it->size == 2);
+    assert(it->position == 1);
+    assert(it->__private_data.block_index == 1);
+
+    // Reset and start over.
+    db1.clear();
+    db1.resize(4);
+    db2.clear();
+    db2.resize(4);
+
+    db1.set(2, 12.8);
+    it = db1.transfer(1, 2, db2, 1);
+
+    // Reset and start over.
+    db1.clear();
+    db1.resize(20);
+    db2.clear();
+    db2.resize(20);
+
+    db1.set(9, 1.1);
+
+    db2.set(10, 1.2);
+    db2.set(11, 1.3);
+
+    it = db1.transfer(9, 9, db2, 9);
+
+    // The source should be entirely empty after the transfer.
+    assert(db1.block_size() == 1);
+    assert(it == db1.begin());
+    assert(it->__private_data.block_index == 0);
+    assert(it->size == 20);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db1.end());
+
+    // Check the destination as well.
+    assert(db2.block_size() == 3);
+    it = db2.begin();
+    assert(it->size == 9);
+    assert(it->__private_data.block_index == 0);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it->size == 3);
+    assert(it->__private_data.block_index == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it->size == 8);
+    assert(it->__private_data.block_index == 2);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db2.end());
+    assert(db2.get<double>(9) == 1.1);
+    assert(db2.get<double>(10) == 1.2);
+    assert(db2.get<double>(11) == 1.3);
+
+    // Reset and start over.
+    db1.clear();
+    db1.resize(20);
+    db2.clear();
+    db2.resize(20);
+
+    db1.set(8, 1.0);
+    db1.set(9, 1.1);
+
+    db2.set(10, 1.2);
+    db2.set(11, 1.3);
+
+    it = db1.transfer(9, 9, db2, 9);
+    assert(it->__private_data.block_index == 2);
+    assert(db1.block_size() == 3);
+    assert(db1.get<double>(8) == 1.0);
+    it = db1.begin();
+    assert(it->size == 8);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it->size == 1);
+    assert(it->type == mdds::mtv::element_type_double);
+    ++it;
+    assert(it->size == 11);
+    assert(it->type == mdds::mtv::element_type_empty);
+    ++it;
+    assert(it == db1.end());
+
+    // Reset and start over.
+    db1.clear();
+    db1.resize(8);
+    db2 = mtv_type(8, true);
+
+    db1.transfer(0, 4, db2, 1);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+    assert(db1.is_empty(5));
+    assert(db1.is_empty(6));
+    assert(db1.is_empty(7));
+
+    assert(db2.get<bool>(0) == true);
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+    assert(db2.is_empty(5));
+    assert(db2.get<bool>(6) == true);
+    assert(db2.get<bool>(7) == true);
+
+    // Start over.
+    db1 = mtv_type(8, int16_t(43));
+    db2 = mtv_type(8);
+    db1.transfer(3, 5, db2, 0);
+    assert(db1.get<int16_t>(0) == 43);
+    assert(db1.get<int16_t>(1) == 43);
+    assert(db1.get<int16_t>(2) == 43);
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+    assert(db1.is_empty(5));
+    assert(db1.get<int16_t>(6) == 43);
+    assert(db1.get<int16_t>(7) == 43);
+
+    assert(db2.get<int16_t>(0) == 43);
+    assert(db2.get<int16_t>(1) == 43);
+    assert(db2.get<int16_t>(2) == 43);
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+    assert(db2.is_empty(5));
+    assert(db2.is_empty(6));
+    assert(db2.is_empty(7));
+
+    // Start over.
+    db1 = mtv_type(5);
+    db2 = mtv_type(5);
+    db1.set<double>(3, 1.1);
+    db1.set<double>(4, 1.2);
+    db2.set<int32_t>(0, 1);
+    db2.set<int32_t>(1, 1);
+
+    db1.transfer(3, 4, db2, 0);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+
+    assert(db2.get<double>(0) == 1.1);
+    assert(db2.get<double>(1) == 1.2);
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+
+    // Start over.
+    db1 = mtv_type(5);
+    db2 = mtv_type(5);
+    db1.set<double>(3, 1.1);
+    db1.set<int32_t>(4, 892);
+    db2.set<int32_t>(0, 1);
+    db2.set<int32_t>(1, 1);
+
+    db1.transfer(3, 4, db2, 0);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+
+    assert(db2.get<double>(0) == 1.1);
+    assert(db2.get<int32_t>(1) == 892);
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+
+    // Start over.
+    db1 = mtv_type(5, false);
+    db2 = mtv_type(5);
+    db1.set<int32_t>(4, 234);
+    db2.set<int8_t>(0, 32);
+    db2.set<uint16_t>(1, 11);
+    db2.set<uint16_t>(2, 22);
+    db2.set<int8_t>(3, 56);
+
+    db1.transfer(3, 4, db2, 1);
+
+    assert(db1.get<bool>(0) == false);
+    assert(db1.get<bool>(1) == false);
+    assert(db1.get<bool>(2) == false);
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+
+    assert(db2.get<int8_t>(0) == 32);
+    assert(db2.get<bool>(1) == false);
+    assert(db2.get<int32_t>(2) == 234);
+    assert(db2.get<int8_t>(3) == 56);
+    assert(db2.is_empty(4));
+
+    // Start over.
+    db1 = mtv_type(5, false);
+    db2 = mtv_type(6);
+    db1.set<int32_t>(4, 234);
+    db2.set<uint32_t>(0, 2345);
+
+    db1.transfer(3, 4, db2, 4);
+
+    assert(db1.get<bool>(0) == false);
+    assert(db1.get<bool>(1) == false);
+    assert(db1.get<bool>(2) == false);
+    assert(db1.is_empty(3));
+    assert(db1.is_empty(4));
+
+    assert(db2.get<uint32_t>(0) == 2345);
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.get<bool>(4) == false);
+    assert(db2.get<int32_t>(5) == 234);
+
+    // Start over
+    db1.clear();
+    db2 = mtv_type(10);
+    db1.push_back<int8_t>(5);
+    db1.push_back<int16_t>(5);
+    db1.push_back<int32_t>(5);
+    db1.push_back<double>(5);
+
+    db1.transfer(0, 3, db2, 6);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.is_empty(3));
+
+    assert(db2.is_empty(0));
+    assert(db2.is_empty(1));
+    assert(db2.is_empty(2));
+    assert(db2.is_empty(3));
+    assert(db2.is_empty(4));
+    assert(db2.is_empty(5));
+    assert(db2.get<int8_t>(6) == 5);
+    assert(db2.get<int16_t>(7) == 5);
+    assert(db2.get<int32_t>(8) == 5);
+    assert(db2.get<double>(9) == 5.0);
+
+    // Start over.
+    db1 = mtv_type(5, true);
+    db2 = mtv_type(6);
+
+    db1.transfer(0, 2, db2, 1);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.get<bool>(3) == true);
+    assert(db1.get<bool>(4) == true);
+
+    assert(db2.is_empty(0));
+    assert(db2.get<bool>(1) == true);
+    assert(db2.get<bool>(2) == true);
+    assert(db2.get<bool>(3) == true);
+    assert(db2.is_empty(4));
+    assert(db2.is_empty(5));
+
+    // Start over.
+    db1 = mtv_type(5, int32_t(987));
+    db1.set(3, 1.1);
+    db1.set(4, 1.2);
+
+    db2 = mtv_type(5);
+    db2.set(0, true);
+    db2.set(1, false);
+
+    db1.transfer(0, 2, db2, 2);
+
+    assert(db1.is_empty(0));
+    assert(db1.is_empty(1));
+    assert(db1.is_empty(2));
+    assert(db1.get<double>(3) == 1.1);
+    assert(db1.get<double>(4) == 1.2);
+
+    assert(db2.get<bool>(0) == true);
+    assert(db2.get<bool>(1) == false);
+    assert(db2.get<int32_t>(2) == 987);
+    assert(db2.get<int32_t>(3) == 987);
+    assert(db2.get<int32_t>(4) == 987);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/Makefile.am b/test/multi_type_vector/element-blocks/Makefile.am
new file mode 100644
index 0000000..db48655
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/Makefile.am
@@ -0,0 +1,35 @@
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include
+
+check_PROGRAMS = test test-soa test-aos
+
+test_SOURCES = \
+	test_main.cpp \
+	test_basic.cpp \
+	test_std_vector_bool.cpp \
+	test_store_types.cpp \
+	test_functions.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_soa_SOURCES = \
+	test_soa.cpp \
+	test_no_standard_blocks_soa.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_aos_SOURCES = \
+	test_aos.cpp \
+	test_no_standard_blocks_aos.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+EXTRA_DIST = \
+	no_standard_blocks_defs.inl \
+	no_standard_blocks_funcs.inl \
+	test_soa.hpp \
+	test_aos.hpp \
+	test_main.hpp
+
+TESTS = test test-soa test-aos
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/multi_type_vector/element-blocks/Makefile.in b/test/multi_type_vector/element-blocks/Makefile.in
new file mode 100644
index 0000000..9a032d1
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/Makefile.in
@@ -0,0 +1,1073 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
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+  len = length(header); \
+  for (i = 1; i <= len; i = i + 1) \
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+
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+	test_soa.hpp \
+	test_aos.hpp \
+	test_main.hpp
+
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+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_aos.Po
+	-rm -f ./$(DEPDIR)/test_basic.Po
+	-rm -f ./$(DEPDIR)/test_functions.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f ./$(DEPDIR)/test_no_standard_blocks_aos.Po
+	-rm -f ./$(DEPDIR)/test_no_standard_blocks_soa.Po
+	-rm -f ./$(DEPDIR)/test_soa.Po
+	-rm -f ./$(DEPDIR)/test_std_vector_bool.Po
+	-rm -f ./$(DEPDIR)/test_store_types.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/element-blocks/no_standard_blocks_defs.inl b/test/multi_type_vector/element-blocks/no_standard_blocks_defs.inl
new file mode 100644
index 0000000..1d8b90f
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/no_standard_blocks_defs.inl
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+// NB: Code in this file must be soa vs aos neutral, and occurs before the
+// inclusion of the header that defines multi_type_vector.
+
+#include <mdds/global.hpp>
+#include <mdds/multi_type_vector/block_funcs.hpp>
+#include <mdds/multi_type_vector/util.hpp>
+#include <mdds/multi_type_vector/macro.hpp>
+
+#include <deque>
+#include <vector>
+#include <type_traits>
+
+namespace mdds { namespace mtv {
+
+// These variables are defined in the header, so if it's included it should
+// cause a compiler error.
+constexpr element_t element_type_boolean = element_type_user_start;
+constexpr element_t element_type_int32 = element_type_user_start + 1;
+constexpr element_t element_type_uint32 = element_type_user_start + 2;
+
+using boolean_element_block = default_element_block<element_type_boolean, bool, std::deque>;
+using int32_element_block = default_element_block<element_type_int32, std::int32_t, std::vector>;
+using uint32_element_block = default_element_block<element_type_uint32, std::uint32_t, delayed_delete_vector>;
+
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(bool, element_type_boolean, false, boolean_element_block)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(std::int32_t, element_type_int32, 0, int32_element_block)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(std::uint32_t, element_type_uint32, 0, uint32_element_block)
+
+struct standard_element_blocks_traits;
+static_assert(
+    !mdds::detail::is_complete<standard_element_blocks_traits>::value,
+    "The standard_element_blocks_traits struct should not have been defined.");
+
+}} // namespace mdds::mtv
+
+static_assert(std::is_same_v<mdds::mtv::boolean_element_block::store_type, std::deque<bool>>);
+static_assert(std::is_same_v<mdds::mtv::int32_element_block::store_type, std::vector<std::int32_t>>);
+static_assert(
+    std::is_same_v<mdds::mtv::uint32_element_block::store_type, mdds::mtv::delayed_delete_vector<std::uint32_t>>);
+
+struct my_trait : mdds::mtv::default_traits
+{
+    using block_funcs = mdds::mtv::element_block_funcs<
+        mdds::mtv::boolean_element_block, mdds::mtv::int32_element_block, mdds::mtv::uint32_element_block>;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/no_standard_blocks_funcs.inl b/test/multi_type_vector/element-blocks/no_standard_blocks_funcs.inl
new file mode 100644
index 0000000..84a1f88
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/no_standard_blocks_funcs.inl
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+void test_mtv_basic()
+{
+    using this_mtv_type = mtv_type<my_trait>;
+
+    this_mtv_type db{};
+
+    db.push_back(true);
+    db.push_back(false);
+    db.push_back<std::int32_t>(123);
+    db.push_back<std::uint32_t>(456u);
+
+    assert(db.size() == 4);
+    assert(db.block_size() == 3);
+    assert(db.get<bool>(0) == true);
+    assert(db.get<bool>(1) == false);
+    assert(db.get<std::int32_t>(2) == 123);
+    assert(db.get<std::uint32_t>(3) == 456u);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_aos.cpp b/test/multi_type_vector/element-blocks/test_aos.cpp
new file mode 100644
index 0000000..cff3488
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_aos.cpp
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_aos.hpp"
+
+int main()
+{
+    test_mtv_basic();
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_aos.hpp b/test/multi_type_vector/element-blocks/test_aos.hpp
new file mode 100644
index 0000000..496a0ed
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_aos.hpp
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+void test_mtv_basic();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_basic.cpp b/test/multi_type_vector/element-blocks/test_basic.cpp
new file mode 100644
index 0000000..0d69a3a
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_basic.cpp
@@ -0,0 +1,46 @@
+
+#include "test_main.hpp"
+
+#include <mdds/multi_type_vector/types.hpp>
+#include <mdds/multi_type_vector.hpp>
+
+constexpr mdds::mtv::element_t type_1 = mdds::mtv::element_type_user_start;
+constexpr mdds::mtv::element_t type_2 = mdds::mtv::element_type_user_start + 1;
+constexpr mdds::mtv::element_t type_3 = mdds::mtv::element_type_user_start + 2;
+constexpr mdds::mtv::element_t type_4 = mdds::mtv::element_type_user_start + 3;
+
+struct my_type_1
+{
+};
+struct my_type_2
+{
+};
+struct my_type_3
+{
+};
+
+// Make sure these three block types can be instantiated without compile errors.
+using my_block1 = mdds::mtv::default_element_block<type_1, my_type_1>;
+using my_block2 = mdds::mtv::managed_element_block<type_2, my_type_2>;
+using my_block3 = mdds::mtv::noncopyable_managed_element_block<type_3, my_type_3>;
+
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS(my_type_1, type_1, my_type_1{}, my_block1)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS_PTR(my_type_2, type_2, nullptr, my_block2)
+MDDS_MTV_DEFINE_ELEMENT_CALLBACKS_PTR(my_type_3, type_3, nullptr, my_block3)
+
+struct my_trait : mdds::mtv::default_traits
+{
+    using block_funcs = mdds::mtv::element_block_funcs<my_block1, my_block2, my_block3>;
+};
+
+using mtv_type = mdds::multi_type_vector<my_trait>;
+
+void mtv_test_element_blocks_buildability()
+{
+    stack_printer __stack_printer__(__func__);
+
+    mtv_type con(20);
+    con.set(0, my_type_1{});
+    con.set(1, new my_type_2);
+    con.set(2, new my_type_3);
+}
diff --git a/test/multi_type_vector/element-blocks/test_functions.cpp b/test/multi_type_vector/element-blocks/test_functions.cpp
new file mode 100644
index 0000000..7dc8aae
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_functions.cpp
@@ -0,0 +1,95 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2023 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_main.hpp"
+
+#include <mdds/multi_type_vector/types.hpp>
+
+#include <vector>
+#include <iostream>
+
+void mtv_test_element_blocks_range()
+{
+    stack_printer __stack_printer__(__func__);
+
+    constexpr mdds::mtv::element_t element_type_int32 = mdds::mtv::element_type_user_start + 2;
+    using block_type = mdds::mtv::default_element_block<element_type_int32, std::int32_t, std::vector>;
+
+    const std::vector<std::int8_t> values = {1, 2, 3, 4, 5};
+    auto blk = block_type(values.begin(), values.end());
+    const auto& crblk = blk;
+
+    assert(block_type::size(blk) == 5u);
+
+    {
+        auto it = block_type::begin(blk), it_end = block_type::end(blk);
+        assert(std::distance(it, it_end) == 5u);
+        assert(*it++ == 1);
+        assert(*it++ == 2);
+        assert(*it++ == 3);
+        assert(*it++ == 4);
+        assert(*it++ == 5);
+        assert(it == it_end);
+    }
+
+    {
+        // immutable range access
+        auto it = block_type::begin(crblk);
+        for (auto v : block_type::range(crblk))
+        {
+            std::cout << "v=" << v << std::endl;
+            assert(v == *it++);
+        }
+
+        assert(it == block_type::end(crblk));
+    }
+
+    {
+        // mutable range access
+        auto it = block_type::begin(blk);
+        for (auto v : block_type::range(blk))
+        {
+            std::cout << "v=" << v << std::endl;
+            assert(v == *it);
+            *it = v + 2;
+            ++it;
+        }
+
+        assert(it == block_type::end(blk));
+
+        it = block_type::begin(blk);
+        assert(*it++ == 3);
+        assert(*it++ == 4);
+        assert(*it++ == 5);
+        assert(*it++ == 6);
+        assert(*it++ == 7);
+        assert(it == block_type::end(blk));
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_main.cpp b/test/multi_type_vector/element-blocks/test_main.cpp
new file mode 100644
index 0000000..b666679
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_main.cpp
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_element_blocks_buildability();
+        mtv_test_element_blocks_std_vector();
+        mtv_test_element_blocks_std_deque();
+        mtv_test_element_blocks_std_vector_bool();
+        mtv_test_element_blocks_std_deque_bool();
+        mtv_test_element_blocks_delayed_delete_vector_bool();
+        mtv_test_element_blocks_range();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_main.hpp b/test/multi_type_vector/element-blocks/test_main.hpp
new file mode 100644
index 0000000..e926af2
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_main.hpp
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+// We don't include any multi_type_vector specific headers here in order to
+// test features controlled by preprocessor defines.
+
+void mtv_test_element_blocks_buildability();
+void mtv_test_element_blocks_std_vector();
+void mtv_test_element_blocks_std_deque();
+void mtv_test_element_blocks_std_vector_bool();
+void mtv_test_element_blocks_std_deque_bool();
+void mtv_test_element_blocks_delayed_delete_vector_bool();
+void mtv_test_element_blocks_range();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_no_standard_blocks_aos.cpp b/test/multi_type_vector/element-blocks/test_no_standard_blocks_aos.cpp
new file mode 100644
index 0000000..3612d0e
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_no_standard_blocks_aos.cpp
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "no_standard_blocks_defs.inl"
+
+// Settting this to 0 should make the multi_type_vector code to NOT include
+// the header for the standard element blocks.
+#define MDDS_MTV_USE_STANDARD_ELEMENT_BLOCKS 0
+#include <mdds/multi_type_vector/aos/main.hpp>
+
+template<typename... Ts>
+using mtv_type = mdds::mtv::aos::multi_type_vector<Ts...>;
+
+#include "no_standard_blocks_funcs.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_no_standard_blocks_soa.cpp b/test/multi_type_vector/element-blocks/test_no_standard_blocks_soa.cpp
new file mode 100644
index 0000000..e6eaedd
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_no_standard_blocks_soa.cpp
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "no_standard_blocks_defs.inl"
+
+// Settting this to 0 should make the multi_type_vector code to NOT include
+// the header for the standard element blocks.
+#define MDDS_MTV_USE_STANDARD_ELEMENT_BLOCKS 0
+#include <mdds/multi_type_vector/soa/main.hpp>
+
+template<typename... Ts>
+using mtv_type = mdds::mtv::soa::multi_type_vector<Ts...>;
+
+#include "no_standard_blocks_funcs.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_soa.cpp b/test/multi_type_vector/element-blocks/test_soa.cpp
new file mode 100644
index 0000000..e034ded
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_soa.cpp
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_soa.hpp"
+
+int main()
+{
+    test_mtv_basic();
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_soa.hpp b/test/multi_type_vector/element-blocks/test_soa.hpp
new file mode 100644
index 0000000..496a0ed
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_soa.hpp
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+void test_mtv_basic();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_std_vector_bool.cpp b/test/multi_type_vector/element-blocks/test_std_vector_bool.cpp
new file mode 100644
index 0000000..f37b6e7
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_std_vector_bool.cpp
@@ -0,0 +1,88 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_main.hpp"
+
+#include <mdds/multi_type_vector/types.hpp>
+#include <mdds/multi_type_vector/block_funcs.hpp>
+
+#include <vector>
+#include <deque>
+
+void mtv_test_element_blocks_std_vector_bool()
+{
+    stack_printer __stack_printer__(__func__);
+
+    constexpr mdds::mtv::element_t element_type_bool = mdds::mtv::element_type_user_start + 3;
+    using this_block = mdds::mtv::default_element_block<element_type_bool, bool, std::vector>;
+
+    static_assert(this_block::block_type == element_type_bool);
+    static_assert(mdds::mtv::detail::has_std_vector_bool_store<this_block>::type::value);
+
+    auto* blk = this_block::create_block(10);
+
+    [[maybe_unused]] auto v = mdds::mtv::detail::get_block_element_at<this_block>(*blk, 2);
+
+    this_block::delete_block(blk);
+}
+
+void mtv_test_element_blocks_std_deque_bool()
+{
+    stack_printer __stack_printer__(__func__);
+
+    constexpr mdds::mtv::element_t element_type_bool = mdds::mtv::element_type_user_start + 2;
+    using this_block = mdds::mtv::default_element_block<element_type_bool, bool, std::deque>;
+
+    static_assert(this_block::block_type == element_type_bool);
+    static_assert(!mdds::mtv::detail::has_std_vector_bool_store<this_block>::type::value);
+
+    auto* blk = this_block::create_block(10);
+
+    [[maybe_unused]] auto v = mdds::mtv::detail::get_block_element_at<this_block>(*blk, 2);
+
+    this_block::delete_block(blk);
+}
+
+void mtv_test_element_blocks_delayed_delete_vector_bool()
+{
+    stack_printer __stack_printer__(__func__);
+
+    constexpr mdds::mtv::element_t element_type_bool = mdds::mtv::element_type_user_start + 1;
+    using this_block = mdds::mtv::default_element_block<element_type_bool, bool, mdds::mtv::delayed_delete_vector>;
+
+    static_assert(this_block::block_type == element_type_bool);
+    static_assert(mdds::mtv::detail::has_std_vector_bool_store<this_block>::type::value);
+
+    auto* blk = this_block::create_block(10);
+
+    [[maybe_unused]] auto v = mdds::mtv::detail::get_block_element_at<this_block>(*blk, 2);
+
+    this_block::delete_block(blk);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/element-blocks/test_store_types.cpp b/test/multi_type_vector/element-blocks/test_store_types.cpp
new file mode 100644
index 0000000..e98a1c9
--- /dev/null
+++ b/test/multi_type_vector/element-blocks/test_store_types.cpp
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_main.hpp"
+
+#include <mdds/multi_type_vector/types.hpp>
+#include <mdds/multi_type_vector/block_funcs.hpp>
+
+#include <vector>
+#include <deque>
+#include <type_traits>
+
+void mtv_test_element_blocks_std_vector()
+{
+    stack_printer __stack_printer__(__func__);
+
+    constexpr mdds::mtv::element_t element_type_int8 = mdds::mtv::element_type_user_start + 2;
+    using this_block = mdds::mtv::default_element_block<element_type_int8, std::int8_t, std::vector>;
+
+    static_assert(this_block::block_type == element_type_int8);
+    static_assert(std::is_same_v<this_block::store_type, std::vector<std::int8_t>>);
+
+    auto* blk = this_block::create_block(10);
+
+    assert(mdds::mtv::get_block_type(*blk) == this_block::block_type);
+    assert(this_block::size(*blk) == 10u);
+
+    auto cap = this_block::capacity(*blk);
+    assert(cap >= 10u);
+
+    this_block::reserve(*blk, 100u);
+    cap = this_block::capacity(*blk);
+    assert(cap >= 100u);
+
+    this_block::shrink_to_fit(*blk);
+
+    this_block::delete_block(blk);
+}
+
+void mtv_test_element_blocks_std_deque()
+{
+    stack_printer __stack_printer__(__func__);
+
+    constexpr mdds::mtv::element_t element_type_int8 = mdds::mtv::element_type_user_start + 20;
+    using this_block = mdds::mtv::default_element_block<element_type_int8, std::int8_t, std::deque>;
+
+    static_assert(this_block::block_type == element_type_int8);
+    static_assert(std::is_same_v<this_block::store_type, std::deque<std::int8_t>>);
+
+    auto* blk = this_block::create_block(10);
+
+    assert(mdds::mtv::get_block_type(*blk) == this_block::block_type);
+    assert(this_block::size(*blk) == 10u);
+
+    // std::deque does not have a capacity() method, but this should still compile.
+    [[maybe_unused]] auto cap = this_block::capacity(*blk);
+
+    // std::deque does not have a reserve() method either.
+    this_block::reserve(*blk, 100u);
+
+    // ditto with shrink_to_fit()
+    this_block::shrink_to_fit(*blk);
+
+    this_block::delete_block(blk);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/Makefile.am b/test/multi_type_vector/event/Makefile.am
new file mode 100644
index 0000000..ddfbe44
--- /dev/null
+++ b/test/multi_type_vector/event/Makefile.am
@@ -0,0 +1 @@
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diff --git a/test/multi_type_vector/event/Makefile.in b/test/multi_type_vector/event/Makefile.in
new file mode 100644
index 0000000..5d17fea
--- /dev/null
+++ b/test/multi_type_vector/event/Makefile.in
@@ -0,0 +1,638 @@
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+  if test "X$(AM_COLOR_TESTS)" = Xno; then \
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+  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
+    if (++n[$$2] == $(am__install_max)) \
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+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
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+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/multi_type_vector/event/aos/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/multi_type_vector/event/aos/Makefile
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+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
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+@am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
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+install: install-am
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+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	-rm -f ./$(DEPDIR)/test_main-test_block_counter.Po
+	-rm -f ./$(DEPDIR)/test_main-test_block_init.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
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+	-rm -f ./$(DEPDIR)/test_main-test_block_init.Po
+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap.Po
+	-rm -f Makefile
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+
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+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/event/aos/test_block_counter.cpp b/test/multi_type_vector/event/aos/test_block_counter.cpp
new file mode 100644
index 0000000..dfe18e7
--- /dev/null
+++ b/test/multi_type_vector/event/aos/test_block_counter.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "block_counter.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/aos/test_block_init.cpp b/test/multi_type_vector/event/aos/test_block_init.cpp
new file mode 100644
index 0000000..c4fad26
--- /dev/null
+++ b/test/multi_type_vector/event/aos/test_block_init.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "block_init.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/aos/test_main.cpp b/test/multi_type_vector/event/aos/test_main.cpp
new file mode 100644
index 0000000..d3c2861
--- /dev/null
+++ b/test/multi_type_vector/event/aos/test_main.cpp
@@ -0,0 +1,47 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2015 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_block_counter();
+        mtv_test_block_init();
+        mtv_test_swap();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_vector/event/aos/test_main.hpp b/test/multi_type_vector/event/aos/test_main.hpp
new file mode 100644
index 0000000..24a26e0
--- /dev/null
+++ b/test/multi_type_vector/event/aos/test_main.hpp
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/aos/main.hpp>
+
+#include <iostream>
+#include <vector>
+
+template<typename Traits>
+using mtv_template_type = mdds::mtv::aos::multi_type_vector<Traits>;
+
+void mtv_test_block_counter();
+void mtv_test_block_init();
+void mtv_test_swap();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/aos/test_swap.cpp b/test/multi_type_vector/event/aos/test_swap.cpp
new file mode 100644
index 0000000..bc7ad88
--- /dev/null
+++ b/test/multi_type_vector/event/aos/test_swap.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "swap.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/soa/Makefile.am b/test/multi_type_vector/event/soa/Makefile.am
new file mode 100644
index 0000000..225da82
--- /dev/null
+++ b/test/multi_type_vector/event/soa/Makefile.am
@@ -0,0 +1,23 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = test-main
+
+test_main_SOURCES = \
+	test_main.cpp \
+	test_block_counter.cpp \
+	test_block_init.cpp \
+	test_swap.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_main_CPPFLAGS = \
+	-I$(srcdir)/../tc \
+	$(AM_CPPFLAGS)
+
+EXTRA_DIST = test_main.hpp
+
+TESTS = test-main
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/multi_type_vector/event/soa/Makefile.in b/test/multi_type_vector/event/soa/Makefile.in
new file mode 100644
index 0000000..7679f69
--- /dev/null
+++ b/test/multi_type_vector/event/soa/Makefile.in
@@ -0,0 +1,1088 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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+	$(top_builddir)/test/test_main-test_global.$(OBJEXT)
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
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+	fi
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+	-rm -f ./$(DEPDIR)/test_main-test_main.Po
+	-rm -f ./$(DEPDIR)/test_main-test_swap.Po
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/event/soa/test_block_counter.cpp b/test/multi_type_vector/event/soa/test_block_counter.cpp
new file mode 100644
index 0000000..dfe18e7
--- /dev/null
+++ b/test/multi_type_vector/event/soa/test_block_counter.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "block_counter.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/soa/test_block_init.cpp b/test/multi_type_vector/event/soa/test_block_init.cpp
new file mode 100644
index 0000000..c4fad26
--- /dev/null
+++ b/test/multi_type_vector/event/soa/test_block_init.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "block_init.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/soa/test_main.cpp b/test/multi_type_vector/event/soa/test_main.cpp
new file mode 100644
index 0000000..2301d61
--- /dev/null
+++ b/test/multi_type_vector/event/soa/test_main.cpp
@@ -0,0 +1,46 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2015 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+int main()
+{
+    try
+    {
+        mtv_test_block_counter();
+        mtv_test_block_init();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/multi_type_vector/event/soa/test_main.hpp b/test/multi_type_vector/event/soa/test_main.hpp
new file mode 100644
index 0000000..78ea1e6
--- /dev/null
+++ b/test/multi_type_vector/event/soa/test_main.hpp
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#pragma once
+
+#define MDDS_MULTI_TYPE_VECTOR_DEBUG 1
+#include <mdds/multi_type_vector/soa/main.hpp>
+
+#include <iostream>
+#include <vector>
+
+template<typename Traits>
+using mtv_template_type = mdds::mtv::soa::multi_type_vector<Traits>;
+
+void mtv_test_block_counter();
+void mtv_test_block_init();
+void mtv_test_swap();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/soa/test_swap.cpp b/test/multi_type_vector/event/soa/test_swap.cpp
new file mode 100644
index 0000000..bc7ad88
--- /dev/null
+++ b/test/multi_type_vector/event/soa/test_swap.cpp
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_main.hpp"
+
+#include "swap.inl"
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/tc/Makefile.am b/test/multi_type_vector/event/tc/Makefile.am
new file mode 100644
index 0000000..3e84c57
--- /dev/null
+++ b/test/multi_type_vector/event/tc/Makefile.am
@@ -0,0 +1,4 @@
+EXTRA_DIST = \
+	block_counter.inl  \
+	block_init.inl \
+	swap.inl
diff --git a/test/multi_type_vector/event/tc/Makefile.in b/test/multi_type_vector/event/tc/Makefile.in
new file mode 100644
index 0000000..5232a12
--- /dev/null
+++ b/test/multi_type_vector/event/tc/Makefile.in
@@ -0,0 +1,464 @@
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+EXTRA_DIST = \
+	block_counter.inl  \
+	block_init.inl \
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+
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+
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/multi_type_vector/event/tc/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/multi_type_vector/event/tc/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
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+check-valgrind-sgcheck-local: 
+tags TAGS:
+
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+
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+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d "$(distdir)/$$file"; then \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/multi_type_vector/event/tc/block_counter.inl b/test/multi_type_vector/event/tc/block_counter.inl
new file mode 100644
index 0000000..55794c7
--- /dev/null
+++ b/test/multi_type_vector/event/tc/block_counter.inl
@@ -0,0 +1,1118 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+struct event_block_counter
+{
+    size_t block_count; // number of element (data) blocks
+    size_t block_count_numeric;
+    size_t block_count_string;
+    size_t block_count_int16;
+    size_t block_count_uint16;
+    size_t block_count_int32;
+    size_t block_count_uint32;
+    size_t block_count_int64;
+    size_t block_count_uint64;
+    size_t block_count_boolean;
+    size_t block_count_int8;
+    size_t block_count_uint8;
+
+    event_block_counter()
+        : block_count(0), block_count_numeric(0), block_count_string(0), block_count_int16(0), block_count_uint16(0),
+          block_count_int32(0), block_count_uint32(0), block_count_int64(0), block_count_uint64(0),
+          block_count_boolean(0), block_count_int8(0), block_count_uint8(0)
+    {}
+
+    /**
+     * This copy constructor intentionally does not copy the counters.
+     */
+    event_block_counter(const event_block_counter&)
+        : block_count(0), block_count_numeric(0), block_count_string(0), block_count_int16(0), block_count_uint16(0),
+          block_count_int32(0), block_count_uint32(0), block_count_int64(0), block_count_uint64(0),
+          block_count_boolean(0), block_count_int8(0), block_count_uint8(0)
+    {}
+
+    void element_block_acquired(const mdds::mtv::base_element_block* block)
+    {
+        ++block_count;
+
+        switch (mdds::mtv::get_block_type(*block))
+        {
+            case mdds::mtv::element_type_double:
+                ++block_count_numeric;
+                break;
+            case mdds::mtv::element_type_string:
+                ++block_count_string;
+                break;
+            case mdds::mtv::element_type_int16:
+                ++block_count_int16;
+                break;
+            case mdds::mtv::element_type_uint16:
+                ++block_count_uint16;
+                break;
+            case mdds::mtv::element_type_int32:
+                ++block_count_int32;
+                break;
+            case mdds::mtv::element_type_uint32:
+                ++block_count_uint32;
+                break;
+            case mdds::mtv::element_type_int64:
+                ++block_count_int64;
+                break;
+            case mdds::mtv::element_type_uint64:
+                ++block_count_uint64;
+                break;
+            case mdds::mtv::element_type_boolean:
+                ++block_count_boolean;
+                break;
+            case mdds::mtv::element_type_int8:
+                ++block_count_int8;
+                break;
+            case mdds::mtv::element_type_uint8:
+                ++block_count_uint8;
+                break;
+            default:;
+        }
+    }
+
+    void element_block_released(const mdds::mtv::base_element_block* block)
+    {
+        --block_count;
+
+        switch (mdds::mtv::get_block_type(*block))
+        {
+            case mdds::mtv::element_type_double:
+                --block_count_numeric;
+                break;
+            case mdds::mtv::element_type_string:
+                --block_count_string;
+                break;
+            case mdds::mtv::element_type_int16:
+                --block_count_int16;
+                break;
+            case mdds::mtv::element_type_uint16:
+                --block_count_uint16;
+                break;
+            case mdds::mtv::element_type_int32:
+                --block_count_int32;
+                break;
+            case mdds::mtv::element_type_uint32:
+                --block_count_uint32;
+                break;
+            case mdds::mtv::element_type_int64:
+                --block_count_int64;
+                break;
+            case mdds::mtv::element_type_uint64:
+                --block_count_uint64;
+                break;
+            case mdds::mtv::element_type_boolean:
+                --block_count_boolean;
+                break;
+            case mdds::mtv::element_type_int8:
+                --block_count_int8;
+                break;
+            case mdds::mtv::element_type_uint8:
+                --block_count_uint8;
+                break;
+            default:;
+        }
+    }
+};
+
+struct eb_counter_trait : public mdds::mtv::standard_element_blocks_traits
+{
+    using event_func = event_block_counter;
+
+    constexpr static mdds::mtv::lu_factor_t loop_unrolling = mdds::mtv::lu_factor_t::lu8;
+};
+
+void mtv_test_block_counter()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    using mtv_type = mtv_template_type<eb_counter_trait>;
+
+    {
+        // Initializing with an empty block should not create any element block.
+        mtv_type db(10);
+        assert(db.event_handler().block_count == 0);
+    }
+
+    {
+        // Initializing with one element block of size 10.
+        mtv_type db(10, 1.2);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.clear();
+        assert(db.event_handler().block_count == 0);
+        assert(db.event_handler().block_count_numeric == 0);
+
+        db.push_back(5.5); // create a new block.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.push_back(6.6); // no new block creation.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.push_back(std::string("foo")); // another new block.
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 1);
+
+        // This should remove the last string block.
+        db.resize(2);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 0);
+
+        // This should have no effect on the block count.
+        db.resize(1);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+
+        // This should remove the last remaining block.
+        db.resize(0);
+        assert(db.event_handler().block_count == 0);
+        assert(db.event_handler().block_count_numeric == 0);
+    }
+
+    {
+        mtv_type db(5);
+        assert(db.event_handler().block_count == 0);
+
+        db.set(0, true);
+        assert(db.event_handler().block_count == 1);
+        db.set(1, 12.2);
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_boolean == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+
+        db.set(4, std::string("foo"));
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_string == 1);
+        db.set(3, std::string("bar"));
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_string == 1);
+
+        // This should delete the top two element blocks.
+        db.set_empty(0, 1);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_boolean == 0);
+        assert(db.event_handler().block_count_numeric == 0);
+
+        // Now, delete the bottom one.
+        db.set_empty(3, 4);
+        assert(db.event_handler().block_count == 0);
+        assert(db.event_handler().block_count_string == 0);
+
+        // Create and delete a block in the middle.
+        db.set(3, false);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_boolean == 1);
+        db.set_empty(3, 3);
+        assert(db.event_handler().block_count == 0);
+        assert(db.event_handler().block_count_boolean == 0);
+
+        db.set(2, 10.5);
+        db.set(3, std::string("hmm"));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 1);
+        db.set_empty(3, 3);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 0);
+
+        // Start over.
+        db.clear();
+        assert(db.event_handler().block_count == 0);
+
+        db.push_back(1.1);
+        db.push_back(1.2);
+        db.push_back(1.3);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+
+        // Put empty block in the middle.
+        db.set_empty(1, 1);
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 2);
+    }
+
+    {
+        mtv_type db(4, 1.2);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+
+        // Split the block into two.
+        db.insert_empty(2, 2);
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 2);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(1, 1.2); // This creates a new element block.
+        assert(db.event_handler().block_count == 1);
+        db.set(0, 1.1); // The element block count should not change.
+        assert(db.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(1, std::string("test"));
+        assert(db.event_handler().block_count == 1);
+        db.set(0, 1.1);
+        assert(db.event_handler().block_count == 2);
+        db.set(0, true);
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_boolean == 1);
+        assert(db.event_handler().block_count_string == 1);
+
+        db.set(0, std::string("foo"));
+        assert(db.event_handler().block_count == 1);
+
+        db.set(1, 1.2);
+        assert(db.event_handler().block_count == 2);
+        db.set(1, std::string("bar"));
+        assert(db.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type db(2);
+        db.set(0, std::string("test")); // This creates a new string block.
+        assert(db.event_handler().block_count == 1);
+        db.set(1, std::string("foo")); // This appends to the existing string block.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_string == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, std::string("test"));
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_string == 1);
+        db.set(2, std::string("foo"));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_string == 2);
+        db.set(1, std::string("bar")); // This merges all data into a single string block.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_string == 1);
+    }
+
+    {
+        mtv_type db(4);
+        db.set(0, std::string("test"));
+        assert(db.event_handler().block_count == 1);
+        db.set(2, std::string("foo1"));
+        assert(db.event_handler().block_count == 2);
+        db.set(3, std::string("foo2"));
+        assert(db.event_handler().block_count == 2);
+        db.set(1, std::string("bar")); // This merges all data into a single string block.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_string == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, std::string("test"));
+        assert(db.event_handler().block_count == 1);
+        db.set(2, 1.2);
+        assert(db.event_handler().block_count == 2);
+        db.set(1, std::string("bar"));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, std::string("test"));
+        assert(db.event_handler().block_count == 1);
+        db.set(2, 1.2);
+        assert(db.event_handler().block_count == 2);
+        db.set(1, 1.1); // This will get prepended to the next numeric block.
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 1);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2, 1.3};
+        mtv_type db(vals.size(), vals.begin(), vals.end());
+        assert(db.event_handler().block_count == 1);
+
+        mtv_type db2(db);
+        assert(db2.event_handler().block_count == 1);
+        db2.push_back(std::string("foo"));
+        assert(db2.event_handler().block_count == 2);
+        mtv_type db3 = db2;
+        assert(db3.event_handler().block_count == 2);
+
+        mtv_type db4(3);
+        db4.insert(0, vals.begin(), vals.end());
+        assert(db4.event_handler().block_count == 1);
+
+        mtv_type db5(3, int64_t(10));
+        assert(db5.event_handler().block_count == 1);
+        db5.insert(0, vals.begin(), vals.end());
+        assert(db5.event_handler().block_count == 2);
+
+        mtv_type db6(2, int32_t(30));
+        assert(db6.event_handler().block_count == 1);
+        db6.insert(1, vals.begin(), vals.end()); // Insert to split the block.
+        assert(db6.event_handler().block_count == 3);
+        assert(db6.event_handler().block_count_int32 == 2);
+        assert(db6.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(1, 1.1);
+        db.set(2, true);
+        assert(db.event_handler().block_count == 2);
+        db.set(1, false);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_boolean == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(1, 1.1);
+        db.set(0, true);
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_boolean == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.set(1, false);
+        assert(db.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, true);
+        db.set(1, 1.1);
+        db.set(2, false);
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_boolean == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.set(1, true);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_boolean == 1);
+
+        db.set(1, 1.1);
+        assert(db.event_handler().block_count == 3);
+        db.set(2, int64_t(10));
+        db.set(1, true);
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_boolean == 1);
+        assert(db.event_handler().block_count_int64 == 1);
+
+        db.set(1, 1.1);
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_boolean == 1);
+        assert(db.event_handler().block_count_int64 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.set(1, int64_t(20));
+        assert(db.event_handler().block_count == 2);
+
+        db.release();
+        assert(db.event_handler().block_count == 0);
+    }
+
+    {
+        mtv_type db;
+        db.push_back(1.1);
+        db.push_back(int64_t(10));
+        db.push_back(std::string("foo"));
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_int64 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 1);
+
+        db.erase(0, 2);
+        assert(db.event_handler().block_count == 0);
+    }
+
+    {
+        mtv_type db;
+        db.push_back(1.1);
+        db.push_back_empty();
+        assert(db.event_handler().block_count == 1);
+        db.erase(0, 0);
+        assert(db.event_handler().block_count == 0);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(0, std::string("top"));
+        db.set(2, std::string("bottom"));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_string == 2);
+        db.erase(1, 1);
+        assert(db.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type db(3);
+        db.set(1, 1.1);
+        assert(db.event_handler().block_count == 1);
+        db.erase(1, 1);
+        assert(db.event_handler().block_count == 0);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(4);
+        db.set(0, 0.1);
+        db.set(1, 0.2);
+        db.set(2, std::string("foo"));
+        db.set(3, std::string("bar"));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_string == 1);
+        db.set(2, vals.begin(), vals.end()); // remove a block and append to previous one.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(4);
+        db.set(0, int32_t(5));
+        db.set(1, int32_t(10));
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_int32 == 1);
+        db.set(2, vals.begin(), vals.end()); // set to empty block.
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(4);
+        db.set(0, int32_t(5));
+        db.set(1, int32_t(10));
+        db.set(2, std::string("foo"));
+        db.set(3, std::string("bar"));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_string == 1);
+        db.set(2, vals.begin(), vals.end()); // replace a block.
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(4, std::string("foo"));
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_string == 1);
+        db.set(0, vals.begin(), vals.end()); // replace the upper part of a block.
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_string == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(4, std::string("foo"));
+        assert(db.event_handler().block_count == 1);
+        db.set(2, vals.begin(), vals.end()); // replace the lower part of the last block.
+        assert(db.event_handler().block_count == 2);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(4, std::string("foo"));
+        db.push_back(int64_t(100));
+        assert(db.event_handler().block_count == 2);
+        db.set(2, vals.begin(), vals.end()); // replace the lower part of a block.
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_string == 1);
+        assert(db.event_handler().block_count_int64 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        std::vector<double> vals = {1.1, 1.2};
+        mtv_type db(6, std::string("foo"));
+        assert(db.event_handler().block_count == 1);
+        db.set(2, vals.begin(), vals.end()); // set the values to the middle of a block.
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_string == 2);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type db(1, 0.1);
+        db.push_back(int16_t(1));
+        db.push_back(int32_t(20));
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_int16 == 1);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+
+        std::vector<double> vals = {1.1, 1.2, 1.3}; // same type as the top block.
+        db.set(0, vals.begin(), vals.end()); // overwrite multiple blocks.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type db(1, std::string("foo"));
+        db.push_back(int16_t(1));
+        db.push_back(int32_t(20));
+        assert(db.event_handler().block_count == 3);
+        assert(db.event_handler().block_count_int16 == 1);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_string == 1);
+
+        std::vector<double> vals = {1.1, 1.2, 1.3}; // differene type from that of the top block.
+        db.set(0, vals.begin(), vals.end()); // overwrite multiple blocks.
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type db(6);
+        db.set(2, 1.1);
+        db.set(3, int32_t(22));
+        assert(db.event_handler().block_count == 2);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        db.erase(2, 3);
+        assert(db.event_handler().block_count == 0);
+    }
+
+    {
+        mtv_type db(6, int8_t('a'));
+        db.set(2, 1.1);
+        db.set(3, int32_t(22));
+        assert(db.event_handler().block_count == 4);
+        assert(db.event_handler().block_count_int32 == 1);
+        assert(db.event_handler().block_count_numeric == 1);
+        assert(db.event_handler().block_count_int8 == 2);
+        db.erase(2, 3);
+        assert(db.event_handler().block_count == 1);
+        assert(db.event_handler().block_count_int8 == 1);
+    }
+
+    {
+        mtv_type src(6, int8_t('a')), dst(6);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 0);
+        src.transfer(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.transfer(3, 5, dst, 3);
+        assert(src.event_handler().block_count == 0);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(6), dst(6);
+        src.set(0, int8_t('z'));
+        src.set(1, int32_t(10));
+        src.set(2, int16_t(5));
+        dst.set(3, 1.1);
+        assert(src.event_handler().block_count == 3);
+        assert(src.event_handler().block_count_int8 == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(src.event_handler().block_count_int16 == 1);
+        assert(dst.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+
+        src.transfer(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 0);
+        assert(dst.event_handler().block_count == 4);
+        assert(dst.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count_int8 == 1);
+        assert(dst.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count_int16 == 1);
+    }
+
+    {
+        mtv_type src(6), dst(6);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 0);
+
+        src.transfer(1, 3, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(6), dst(6);
+        src.set(3, 1.1);
+        src.set(4, 1.2);
+        src.set(5, 1.3);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 0);
+
+        src.transfer(1, 3, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(3), dst(3);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(4), dst(3);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+        src.set(3, 1.4);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(5), dst(3);
+        src.set(0, std::string("2.0"));
+        src.set(1, 1.1);
+        src.set(2, 1.2);
+        src.set(3, 1.3);
+        src.set(4, 1.4);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(1, 3, dst, 0);
+        assert(src.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(4), dst(3);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+        src.set(3, 1.4);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(1, 3, dst, 0);
+        assert(src.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(5), dst(3);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+        src.set(3, 1.4);
+        src.set(4, std::string("2.4"));
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(1, 3, dst, 0);
+        assert(src.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(5), dst(3);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+        src.set(3, 1.4);
+        src.set(4, 1.5);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(1, 3, dst, 0);
+        assert(src.event_handler().block_count == 3);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(3), dst(3);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, int32_t(100));
+        dst.set(2, std::string("2.3"));
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 3);
+        assert(dst.event_handler().block_count_string == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 3);
+        assert(src.event_handler().block_count_string == 2);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(5), dst(5);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+        src.set(3, 1.4);
+        src.set(4, 1.5);
+
+        dst.set(0, std::string("2.1"));
+        dst.set(1, std::string("2.2"));
+        dst.set(2, int32_t(100));
+        dst.set(3, std::string("2.3"));
+        dst.set(4, std::string("2.4"));
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 3);
+        assert(dst.event_handler().block_count_string == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(1, 3, dst, 1);
+        assert(src.event_handler().block_count == 5);
+        assert(src.event_handler().block_count_numeric == 2);
+        assert(src.event_handler().block_count_string == 2);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 3);
+        assert(dst.event_handler().block_count_string == 2);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(4);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, 2.1);
+        dst.set(1, int32_t(5));
+        dst.set(2, int32_t(6));
+        dst.set(3, int32_t(7));
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(5);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, 2.1);
+        dst.set(1, int32_t(5));
+        dst.set(2, int32_t(6));
+        dst.set(3, int32_t(7));
+        dst.set(4, 2.2);
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 3);
+        assert(dst.event_handler().block_count_numeric == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(4);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, int32_t(5));
+        dst.set(1, int32_t(6));
+        dst.set(2, int32_t(7));
+        dst.set(3, 2.1);
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+
+        src.swap(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(4);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, int32_t(5));
+        dst.set(1, int32_t(6));
+        dst.set(2, int32_t(7));
+        dst.set(3, int32_t(8));
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(0, 2, dst, 0);
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(5);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, 2.1);
+        dst.set(1, int32_t(5));
+        dst.set(2, int32_t(6));
+        dst.set(3, int32_t(7));
+        dst.set(4, int32_t(8));
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count_int32 == 1);
+    }
+
+    {
+        mtv_type src(3), dst(5);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, int32_t(4));
+        dst.set(1, int32_t(5));
+        dst.set(2, int32_t(6));
+        dst.set(3, int32_t(7));
+        dst.set(4, int32_t(8));
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.swap(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 3);
+        assert(dst.event_handler().block_count_int32 == 2);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(4);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, int32_t(4));
+        dst.set(1, int32_t(5));
+        dst.set(2, int32_t(6));
+        dst.set(3, int32_t(7));
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(5);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, int32_t(4));
+        dst.set(1, int32_t(5));
+        dst.set(2, int32_t(6));
+        dst.set(3, int32_t(7));
+        dst.set(4, 2.1);
+
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_numeric == 1);
+        assert(dst.event_handler().block_count_int32 == 1);
+
+        src.swap(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 1);
+        assert(src.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count == 2);
+        assert(dst.event_handler().block_count_int32 == 1);
+        assert(dst.event_handler().block_count_numeric == 1);
+    }
+
+    {
+        mtv_type src(3), dst(5);
+        src.set(0, 1.1);
+        src.set(1, 1.2);
+        src.set(2, 1.3);
+
+        dst.set(0, 2.1);
+        dst.set(4, 2.2);
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 2);
+
+        src.transfer(0, 2, dst, 1);
+        assert(src.event_handler().block_count == 0);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type src(20), dst(20);
+        src.set(9, 1.2);
+
+        dst.set(10, 2.1);
+        dst.set(11, 2.2);
+
+        assert(src.event_handler().block_count == 1);
+        assert(dst.event_handler().block_count == 1);
+
+        src.transfer(9, 9, dst, 9);
+        assert(src.event_handler().block_count == 0);
+        assert(dst.event_handler().block_count == 1);
+    }
+
+    {
+        mtv_type db1(10);
+        db1.set<int32_t>(0, 2);
+        db1.set<int32_t>(1, 3);
+        db1.set<int32_t>(2, 4);
+        db1.set<std::string>(3, "A");
+        db1.set<std::string>(4, "B");
+        db1.set<std::string>(5, "C");
+
+        // Leave some empty range.
+        mtv_type db2(10);
+        for (int32_t i = 0; i < 10; ++i)
+            db2.set<int32_t>(i, 10 + i);
+        db2.set<int8_t>(5, 'Z');
+
+        assert(db1.event_handler().block_count == 2);
+        assert(db1.event_handler().block_count_int32 == 1);
+        assert(db1.event_handler().block_count_string == 1);
+
+        assert(db2.event_handler().block_count == 3);
+        assert(db2.event_handler().block_count_int32 == 2);
+        assert(db2.event_handler().block_count_int8 == 1);
+
+        db1.swap(1, 7, db2, 2);
+
+        assert(db1.event_handler().block_count == 3);
+        assert(db1.event_handler().block_count_int32 == 2);
+        assert(db1.event_handler().block_count_string == 0);
+        assert(db1.event_handler().block_count_int8 == 1);
+
+        assert(db2.event_handler().block_count == 3);
+        assert(db2.event_handler().block_count_int32 == 2);
+        assert(db2.event_handler().block_count_int8 == 0);
+        assert(db2.event_handler().block_count_string == 1);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/tc/block_init.inl b/test/multi_type_vector/event/tc/block_init.inl
new file mode 100644
index 0000000..e530c12
--- /dev/null
+++ b/test/multi_type_vector/event/tc/block_init.inl
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+struct event_block_init
+{
+    std::string name;
+    std::string ctor_type;
+
+    event_block_init() : ctor_type("empty")
+    {}
+    event_block_init(const std::string& _name) : name(_name), ctor_type("normal")
+    {}
+    event_block_init(const event_block_init& other) : name(other.name), ctor_type("copy")
+    {}
+    event_block_init(event_block_init&& other) : name(std::move(other.name)), ctor_type("move")
+    {}
+
+    void element_block_acquired(const mdds::mtv::base_element_block* /*block*/)
+    {}
+    void element_block_released(const mdds::mtv::base_element_block* /*block*/)
+    {}
+};
+
+struct eb_init_trait : public mdds::mtv::standard_element_blocks_traits
+{
+    using event_func = event_block_init;
+
+    constexpr static mdds::mtv::lu_factor_t loop_unrolling = mdds::mtv::lu_factor_t::lu8;
+};
+
+void mtv_test_block_init()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    using mtv_type = mtv_template_type<eb_init_trait>;
+
+    {
+        mtv_type db(event_block_init("some name")); // pass an rvalue
+        assert(db.event_handler().name == "some name");
+        assert(db.event_handler().ctor_type == "move");
+
+        auto db2{db};
+        assert(db2.event_handler().name == "some name");
+        assert(db2.event_handler().ctor_type == "copy");
+    }
+
+    {
+        event_block_init ebi("other name");
+        assert(ebi.ctor_type == "normal");
+        mtv_type db(ebi); // pass an lvalue
+        assert(db.event_handler().name == "other name");
+        assert(db.event_handler().ctor_type == "copy");
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/event/tc/swap.inl b/test/multi_type_vector/event/tc/swap.inl
new file mode 100644
index 0000000..60d8ef4
--- /dev/null
+++ b/test/multi_type_vector/event/tc/swap.inl
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2022 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+struct event_handler : public mdds::mtv::empty_event_func
+{
+    std::string name;
+
+    event_handler()
+    {}
+};
+
+struct trait : public mdds::mtv::default_traits
+{
+    using event_func = event_handler;
+};
+
+using mtv_type = mtv_template_type<trait>;
+
+void mtv_test_swap()
+{
+    stack_printer __stack_printer__(__FUNCTION__);
+
+    mtv_type db1(10), db2(2);
+    db1.event_handler().name = "db1";
+    db2.event_handler().name = "db2";
+
+    assert(db1.size() == 10);
+    assert(db2.size() == 2);
+    assert(db1.event_handler().name == "db1");
+    assert(db2.event_handler().name == "db2");
+
+    // This should also swap the event handlers.
+    db1.swap(db2);
+
+    assert(db1.size() == 2);
+    assert(db2.size() == 10);
+    assert(db1.event_handler().name == "db2");
+    assert(db2.event_handler().name == "db1");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/multi_type_vector/perf/Makefile.am b/test/multi_type_vector/perf/Makefile.am
new file mode 100644
index 0000000..d5c0088
--- /dev/null
+++ b/test/multi_type_vector/perf/Makefile.am
@@ -0,0 +1,14 @@
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include
+
+check_PROGRAMS = test
+
+test_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+
+
+
diff --git a/test/multi_type_vector/perf/Makefile.in b/test/multi_type_vector/perf/Makefile.in
new file mode 100644
index 0000000..a448f9c
--- /dev/null
+++ b/test/multi_type_vector/perf/Makefile.in
@@ -0,0 +1,613 @@
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diff --git a/test/multi_type_vector/perf/test_main.cpp b/test/multi_type_vector/perf/test_main.cpp
new file mode 100644
index 0000000..5edae6d
--- /dev/null
+++ b/test/multi_type_vector/perf/test_main.cpp
@@ -0,0 +1,132 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2011-2013 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+#include <mdds/multi_type_vector.hpp>
+
+#include <cassert>
+#include <sstream>
+#include <vector>
+#include <deque>
+
+using namespace std;
+using namespace mdds;
+
+namespace {
+
+typedef mdds::multi_type_vector<mdds::mtv::standard_element_blocks_traits> mtv_type;
+
+void mtv_perf_test_block_position_lookup()
+{
+    size_t n = 24000;
+
+    {
+        // Default insertion which always looks up the right element block
+        // from the position of the first block.  As such, as the block size
+        // grows, so does the time it takes to search for the right block.
+
+        mtv_type db(n * 2);
+        double val1 = 1.1;
+        int val2 = 23;
+        stack_printer __stack_printer__("::mtv_perf_test_block_position_lookup::default insertion");
+        for (size_t i = 0; i < n; ++i)
+        {
+            size_t pos1 = i * 2, pos2 = i * 2 + 1;
+            db.set(pos1, val1);
+            db.set(pos2, val2);
+        }
+    }
+
+    {
+        // As a solution for this, we can use an iterator to specify the start
+        // position, which eliminates the above scalability problem nicely.
+
+        mtv_type db(n * 2);
+        mtv_type::iterator pos_hint = db.begin();
+        double val1 = 1.1;
+        int val2 = 23;
+        stack_printer __stack_printer__("::mtv_perf_test_block_position_lookup::insertion with position hint");
+        for (size_t i = 0; i < n; ++i)
+        {
+            size_t pos1 = i * 2, pos2 = i * 2 + 1;
+            pos_hint = db.set(pos_hint, pos1, val1);
+            pos_hint = db.set(pos_hint, pos2, val2);
+        }
+    }
+}
+
+void mtv_perf_test_insert_via_position_object()
+{
+    size_t data_size = 80000;
+    mtv_type db(data_size);
+    {
+        stack_printer __stack_printer__("::mtv_perf_test_insert_via_position_object initialize mtv.");
+        mtv_type::iterator it = db.begin();
+        for (size_t i = 0, n = db.size() / 2; i < n; ++i)
+        {
+            it = db.set(it, i * 2, 1.1);
+        }
+    }
+
+    mtv_type db2 = db;
+    {
+        stack_printer __stack_printer__("::mtv_perf_test_insert_via_position_object insert with position hint.");
+        mtv_type::iterator it = db2.begin();
+        for (size_t i = 0, n = db2.size(); i < n; ++i)
+        {
+            it = db2.set(it, i, string("foo"));
+        }
+    }
+
+    db2 = db;
+    {
+        stack_printer __stack_printer__("::mtv_perf_test_insert_via_position_object insert via position object.");
+        mtv_type::position_type pos = db2.position(0);
+        for (; pos.first != db2.end(); pos = mtv_type::next_position(pos))
+        {
+            size_t log_pos = mtv_type::logical_position(pos);
+            pos.first = db2.set(pos.first, log_pos, string("foo"));
+            pos.second = log_pos - pos.first->position;
+        }
+    }
+}
+
+} // namespace
+
+int main()
+try
+{
+    mtv_perf_test_block_position_lookup();
+    mtv_perf_test_insert_via_position_object();
+
+    return EXIT_SUCCESS;
+}
+catch (...)
+{
+    return EXIT_FAILURE;
+}
diff --git a/test/point_quad_tree/Makefile.am b/test/point_quad_tree/Makefile.am
new file mode 100644
index 0000000..b4927a7
--- /dev/null
+++ b/test/point_quad_tree/Makefile.am
@@ -0,0 +1,14 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
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+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+TESTS = test-main
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/point_quad_tree/Makefile.in b/test/point_quad_tree/Makefile.in
new file mode 100644
index 0000000..3b775e7
--- /dev/null
+++ b/test/point_quad_tree/Makefile.in
@@ -0,0 +1,990 @@
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+	$(AM_V_CXXLD)$(CXXLINK) $(test_main_OBJECTS) $(test_main_LDADD) $(LIBS)
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+	  if test $$# -gt 0; then \
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+	esac; \
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+# Recover from deleted '.trs' file; this should ensure that
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+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
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+	 else								\
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+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/point_quad_tree/test_main.cpp b/test/point_quad_tree/test_main.cpp
new file mode 100644
index 0000000..605e410
--- /dev/null
+++ b/test/point_quad_tree/test_main.cpp
@@ -0,0 +1,477 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2010 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "mdds/point_quad_tree.hpp"
+
+#include <algorithm>
+#include <memory>
+#include <vector>
+#include <sstream>
+#include <boost/cstdint.hpp>
+
+using namespace std;
+using namespace mdds;
+using ::boost::uint16_t;
+
+struct data_printer
+{
+    void operator()(const string* p)
+    {
+        cout << *p << " ";
+    }
+};
+
+template<typename _DbType>
+struct search_result_printer
+{
+    void operator()(const pair<const typename _DbType::point, const typename _DbType::value_type>& r) const
+    {
+        cout << "  (x=" << r.first.x << ", y=" << r.first.y << ", value='" << *r.second << "')" << endl;
+    }
+};
+
+void pqt_test_basic()
+{
+    stack_printer __stack_printer__("::pqt_test");
+    typedef point_quad_tree<uint16_t, const string*> db_type;
+    db_type db;
+
+    string A("A");
+    string B("B");
+    string C("C");
+    string D("D");
+    string E("E");
+    string F("F");
+    string G("G");
+    string H("H");
+    string I("I");
+    string J("J");
+    string K("K");
+    string L("L");
+    string M("M");
+    string N("N");
+
+    db.insert(25, 32, &A);
+    db.insert(5, 45, &B);
+    db.insert(52, 10, &C);
+    db.insert(80, 5, &D);
+    db.insert(40, 50, &E);
+    db.insert(10, 10, &F);
+    db.insert(20, 20, &G);
+    db.insert(80, 80, &H);
+    db.insert(58, 46, &I);
+    db.insert(36, 55, &J);
+    db.insert(26, 52, &K);
+    db.insert(38, 68, &L);
+    db.insert(39, 78, &M);
+    db.insert(72, 52, &N);
+
+    assert(db.size() == 14);
+
+    cout << "node count = " << get_node_instance_count() << endl;
+    db.dump_tree_svg("./obj/test.svg");
+
+    {
+        db_type::data_array_type result;
+        db.search_region(10, 10, 60, 20, result);
+        cout << "search region: (10, 10, 60, 20)" << endl;
+        cout << "result: ";
+        for_each(result.begin(), result.end(), data_printer());
+        cout << endl;
+
+        result.clear();
+        db.search_region(10, 10, 61, 61, result);
+        cout << "search region: (10, 10, 61, 61)" << endl;
+        cout << "result: ";
+        for_each(result.begin(), result.end(), data_printer());
+        cout << endl;
+    }
+
+    db_type::search_results result = db.search_region(10, 10, 60, 20);
+    db_type::search_results::const_iterator itr = result.begin(), itr_end = result.end();
+    cout << "result: " << endl;
+    for_each(result.begin(), result.end(), search_result_printer<db_type>());
+
+    result = db.search_region(10, 10, 61, 61);
+    itr = result.begin(), itr_end = result.end();
+    cout << "result: " << endl;
+    for_each(result.begin(), result.end(), search_result_printer<db_type>());
+
+    db.remove(20, 20);
+    db.remove(40, 50);
+    assert(db.size() == 12);
+    db.dump_tree_svg("./obj/test-remove.svg");
+
+    db.clear();
+    assert(db.empty());
+    assert(db.size() == 0);
+}
+
+void pqt_test_insertion_removal()
+{
+    stack_printer __stack_printer__("::pqt_test_insertion_removal");
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    db_type db;
+
+    // Check its empty-ness...
+    assert(db.empty());
+    assert(db.size() == 0);
+
+    // Create all data instances.
+    vector<unique_ptr<string>> data_store;
+    data_store.reserve(100);
+    for (size_t i = 0; i < 100; ++i)
+    {
+        ostringstream os;
+        os << "0x" << hex << i;
+        data_store.emplace_back(new string(os.str()));
+    }
+
+    vector<db_type::node_data> expected;
+
+    // Insert data one by one, and verify each insertion.
+    for (int32_t i = 0; i < 10; ++i)
+    {
+        for (int32_t j = 0; j < 10; ++j)
+        {
+            int32_t x = i * 10 + 1, y = j * 10 + 1;
+            size_t index = i * 10 + j;
+            const string* data_ptr = data_store[index].get();
+            cout << "inserting '" << *data_ptr << "' at (" << x << "," << y << ")" << endl;
+            db.insert(x, y, data_ptr);
+            expected.push_back(db_type::node_data(x, y, data_ptr));
+
+            vector<db_type::node_data> stored_data;
+            db.get_all_stored_data(stored_data);
+            assert(stored_data.size() == (index + 1));
+            assert(db.size() == (index + 1));
+            assert(!db.empty());
+            bool success = db.verify_data(expected);
+            assert(success);
+        }
+    }
+    db.dump_tree_svg("./obj/pqt_test_insertion.svg");
+
+    // Remove data one by one, and check the size after each removal.
+    size_t node_count = 100;
+    for (int32_t i = 0; i < 10; ++i)
+    {
+        for (int32_t j = 0; j < 10; ++j)
+        {
+            int32_t x = i * 10 + 1, y = j * 10 + 1;
+            db.remove(x, y);
+            size_t n = db.size();
+            cout << "removing node at (" << x << "," << y << ")  "
+                 << "size after removal: " << n << endl;
+            --node_count;
+            assert(node_count == n);
+        }
+    }
+}
+
+void pqt_test_remove_root()
+{
+    stack_printer __stack_printer__("::pqt_test_remove_root");
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    string O("O");
+    string NW("NW");
+    string NE("NE");
+    string SW("SW");
+    string SE("SE");
+    db_type db;
+
+    // Insert all data and verify their storage.
+    db.insert(10, 10, &O);
+    db.insert(20, 0, &NE);
+    db.insert(0, 0, &NW);
+    db.insert(20, 20, &SE);
+    db.insert(0, 20, &SW);
+    db.dump_tree_svg("./obj/pqt_test_remove_root-1.svg");
+
+    vector<db_type::node_data> expected;
+    expected.push_back(db_type::node_data(10, 10, &O));
+    expected.push_back(db_type::node_data(20, 0, &NE));
+    expected.push_back(db_type::node_data(0, 0, &NW));
+    expected.push_back(db_type::node_data(20, 20, &SE));
+    expected.push_back(db_type::node_data(0, 20, &SW));
+    bool success = db.verify_data(expected);
+    assert(success);
+    assert(db.size() == 5);
+
+    // Now, remove the root node.
+    db.remove(10, 10);
+    db.dump_tree_svg("./obj/pqt_test_remove_root-2.svg");
+    expected.clear();
+    expected.push_back(db_type::node_data(20, 0, &NE));
+    expected.push_back(db_type::node_data(0, 0, &NW));
+    expected.push_back(db_type::node_data(20, 20, &SE));
+    expected.push_back(db_type::node_data(0, 20, &SW));
+    success = db.verify_data(expected);
+    assert(success);
+    assert(db.size() == 4);
+}
+
+void pqt_test_equality()
+{
+    stack_printer __stack_printer__("::pqt_test_equality");
+
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    db_type db1, db2;
+
+    string A("A");
+    string B("B");
+    string C("C");
+    string D("D");
+    string E("E");
+    string F("F");
+
+    assert(db1 == db2); // both are empty.
+
+    db1.insert(0, 0, &A);
+    db2.insert(0, 0, &A);
+    assert(db1 == db2);
+    db1.remove(0, 0);
+    assert(db1 != db2);
+    db1.insert(0, 0, &B);
+    assert(db1 != db2);
+    db2.insert(0, 0, &B); // B overwrites A.
+    assert(db1 == db2); // Both should have B at (0,0).
+    db1.insert(1, 1, &C);
+    db2.insert(2, 2, &C);
+    assert(db1 != db2);
+    db1.insert(2, 2, &C);
+    db2.insert(1, 1, &C);
+    assert(db1 == db2);
+
+    // Inserting data in different orders should make no difference in equality.
+    db1.insert(1, 3, &D);
+    db1.insert(1, 4, &E);
+    db1.insert(1, 5, &F);
+
+    db2.insert(1, 5, &F);
+    db2.insert(1, 4, &E);
+    db2.insert(1, 3, &D);
+    assert(db1 == db2);
+    db1.remove(1, 4);
+    db2.remove(1, 4);
+    assert(db1 == db2);
+
+    // Make them empty again.
+    db1.clear();
+    db2.clear();
+    assert(db1 == db2);
+}
+
+void pqt_test_assignment()
+{
+    stack_printer __stack_printer__("::pqt_test_assignment");
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    db_type db1, db2;
+    string A("A");
+    string B("B");
+    string C("C");
+    string D("D");
+    string E("E");
+    string F("F");
+
+    db1.insert(0, 10, &A);
+    db1.insert(2, 5, &B);
+    db1.insert(-10, 2, &C);
+    db1.insert(5, 7, &D);
+    vector<db_type::node_data> expected;
+    expected.push_back(db_type::node_data(0, 10, &A));
+    expected.push_back(db_type::node_data(2, 5, &B));
+    expected.push_back(db_type::node_data(-10, 2, &C));
+    expected.push_back(db_type::node_data(5, 7, &D));
+    bool success = db1.verify_data(expected);
+    assert(success);
+
+    db2 = db1;
+    success = db2.verify_data(expected);
+    assert(success);
+    success = db1.verify_data(expected);
+    assert(success);
+
+    db2.insert(12, 45, &E);
+    db2.insert(20, 42, &F);
+    success = db2.verify_data(expected); // This should fail.
+    assert(!success);
+    db2 = db1; // Assign once again.
+    success = db2.verify_data(expected); // This now should succeed.
+    assert(success);
+}
+
+void pqt_test_swap()
+{
+    stack_printer __stack_printer__("::pqt_test_swap");
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    db_type db1, db2;
+    string A("A");
+    string B("B");
+    string C("C");
+    string D("D");
+    string E("E");
+    string F("F");
+
+    db1.insert(0, 10, &A);
+    db1.insert(2, 5, &B);
+    db1.insert(-10, 2, &C);
+    db1.insert(5, 7, &D);
+    vector<db_type::node_data> expected;
+    expected.push_back(db_type::node_data(0, 10, &A));
+    expected.push_back(db_type::node_data(2, 5, &B));
+    expected.push_back(db_type::node_data(-10, 2, &C));
+    expected.push_back(db_type::node_data(5, 7, &D));
+    bool success = db1.verify_data(expected);
+    assert(success);
+    assert(db2.empty());
+
+    db1.swap(db2);
+    assert(db1.empty());
+    assert(!db2.empty());
+    success = db2.verify_data(expected);
+    assert(success);
+}
+
+template<typename _DbType>
+bool verify_find(
+    const _DbType& db, typename _DbType::key_type x, typename _DbType::key_type y,
+    const typename _DbType::value_type data)
+{
+    try
+    {
+        typename _DbType::value_type found = db.find(x, y);
+        cout << "found at (" << x << "," << y << "): " << found << endl;
+        if (found == data)
+            return true;
+    }
+    catch (const typename _DbType::data_not_found&)
+    {
+        cout << "nothing found at (" << x << "," << y << ")" << endl;
+    }
+    return false;
+}
+
+void pqt_test_find()
+{
+    stack_printer __stack_printer__("::pqt_test_find");
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    db_type db;
+    string A("A");
+    string B("B");
+    string C("C");
+    string D("D");
+    string E("E");
+    string F("F");
+    db.insert(92, 27, &A);
+    db.insert(53, 26, &B);
+    db.insert(69, 18, &C);
+    db.insert(0, 78, &D);
+    db.insert(17, 7, &E);
+    db.insert(91, 88, &F);
+    assert(db.size() == 6);
+    db.dump_tree_svg("obj/pqt_test_find.svg");
+
+    bool check;
+    check = verify_find(db, 92, 27, &A);
+    assert(check);
+    check = verify_find(db, 53, 26, &B);
+    assert(check);
+    check = verify_find(db, 69, 18, &C);
+    assert(check);
+    check = verify_find(db, 0, 78, &D);
+    assert(check);
+    check = verify_find(db, 17, 7, &E);
+    assert(check);
+    check = verify_find(db, 91, 88, &F);
+    assert(check);
+
+    // Check for non-existent data.
+    check = verify_find(db, 34, 86, &A);
+    assert(!check);
+    check = verify_find(db, -1, 7, &A);
+    assert(!check);
+    check = verify_find(db, 91, 27, &A);
+    assert(!check);
+}
+
+void pqt_test_node_access()
+{
+    stack_printer __stack_printer__("::pqt_test_node_access");
+    typedef point_quad_tree<int32_t, const string*> db_type;
+    db_type db;
+    db_type::node_access nac = db.get_node_access();
+    assert(!nac);
+    string A("A");
+    string B("B");
+    string C("C");
+    string D("D");
+    string E("E");
+    string F("F");
+    db.insert(92, 27, &A);
+    db.insert(53, 26, &B);
+    db.insert(69, 18, &C);
+    db.insert(0, 78, &D);
+    db.insert(17, 7, &E);
+    db.insert(91, 88, &F);
+    assert(db.size() == 6);
+
+    nac = db.get_node_access();
+    // Test root node.
+    assert(nac);
+    assert(nac.x() == 92);
+    assert(nac.y() == 27);
+    assert(nac.data() == &A);
+
+    bool success = db.verify_node_iterator(nac);
+    assert(success);
+}
+
+int main()
+{
+    try
+    {
+        pqt_test_basic();
+        pqt_test_insertion_removal();
+        pqt_test_remove_root();
+        pqt_test_equality();
+        pqt_test_assignment();
+        pqt_test_swap();
+        pqt_test_find();
+        pqt_test_node_access();
+        assert(get_node_instance_count() == 0);
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
diff --git a/test/ref_pair_test.cpp b/test/ref_pair_test.cpp
new file mode 100644
index 0000000..4a4c58f
--- /dev/null
+++ b/test/ref_pair_test.cpp
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2020 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "mdds/ref_pair.hpp"
+
+#include <iostream>
+
+using namespace std;
+
+void test_basic()
+{
+    stack_printer __stack_printer__("::test_basic");
+
+    using rp_type = mdds::detail::ref_pair<const int, int>;
+    using pair_type = std::pair<int, int>;
+
+    int v1 = 11;
+    int v2 = 22;
+    rp_type rp(v1, v2);
+
+    rp.second = 34;
+
+    assert(rp == pair_type(11, 34));
+    assert(rp != pair_type(12, 34));
+    assert(rp != pair_type(11, 32));
+    assert(rp == rp);
+
+    int v3 = 23;
+    int v4 = 33;
+    rp_type rp2(v3, v4);
+    assert(rp != rp2);
+    assert(rp2 == pair_type(23, 33));
+
+    rp_type rp3(rp);
+    assert(rp3 == rp);
+}
+
+void test_used_in_iterator()
+{
+    stack_printer __stack_printer__("::test_used_in_iterator");
+
+    using rp_type = mdds::detail::ref_pair<int, int>;
+
+    struct fake_iterator
+    {
+        int m_v1 = 222;
+        int m_v2 = 456;
+
+        fake_iterator()
+        {}
+
+        rp_type operator*()
+        {
+            return rp_type(m_v1, m_v2);
+        }
+
+        rp_type operator->()
+        {
+            return rp_type(m_v1, m_v2);
+        }
+    };
+
+    fake_iterator it;
+
+    assert((*it).first == 222);
+    assert((*it).second == 456);
+    assert(it->first == 222);
+    assert(it->second == 456);
+
+    // Make sure the member values can be modified.
+    it->second = 897;
+    assert(it->second == 897);
+    (*it).first = -23;
+    assert(it->first == -23);
+}
+
+int main()
+{
+    test_basic();
+    test_used_in_iterator();
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/Makefile.am b/test/rtree/Makefile.am
new file mode 100644
index 0000000..a664104
--- /dev/null
+++ b/test/rtree/Makefile.am
@@ -0,0 +1,41 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+DISTCLEANFILES = \
+	rtree-test-*.obj \
+	rtree-test-*.svg
+
+check_PROGRAMS = test-main test-bulkload
+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_main_SOURCES = \
+	test_basic.cpp \
+	test_copy.cpp \
+	test_directory_node_split.cpp \
+	test_erase_directories.cpp \
+	test_exact_search_by_extent.cpp \
+	test_exact_search_by_point.cpp \
+	test_forced_reinsertion.cpp \
+	test_geometry.cpp \
+	test_intersection.cpp \
+	test_main.cpp \
+	test_move.cpp \
+	test_node_split.cpp \
+	test_point_objects.cpp \
+	test_square_distance.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+test_bulkload_SOURCES = \
+	test_bulkload_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+EXTRA_DIST = test_global_rtree.hpp
+
+TESTS = test-main test-bulkload
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/rtree/Makefile.in b/test/rtree/Makefile.in
new file mode 100644
index 0000000..429699f
--- /dev/null
+++ b/test/rtree/Makefile.in
@@ -0,0 +1,1089 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
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+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_basic.Po
+	-rm -f ./$(DEPDIR)/test_bulkload_main.Po
+	-rm -f ./$(DEPDIR)/test_copy.Po
+	-rm -f ./$(DEPDIR)/test_directory_node_split.Po
+	-rm -f ./$(DEPDIR)/test_erase_directories.Po
+	-rm -f ./$(DEPDIR)/test_exact_search_by_extent.Po
+	-rm -f ./$(DEPDIR)/test_exact_search_by_point.Po
+	-rm -f ./$(DEPDIR)/test_forced_reinsertion.Po
+	-rm -f ./$(DEPDIR)/test_geometry.Po
+	-rm -f ./$(DEPDIR)/test_intersection.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f ./$(DEPDIR)/test_move.Po
+	-rm -f ./$(DEPDIR)/test_node_split.Po
+	-rm -f ./$(DEPDIR)/test_point_objects.Po
+	-rm -f ./$(DEPDIR)/test_square_distance.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_basic.Po
+	-rm -f ./$(DEPDIR)/test_bulkload_main.Po
+	-rm -f ./$(DEPDIR)/test_copy.Po
+	-rm -f ./$(DEPDIR)/test_directory_node_split.Po
+	-rm -f ./$(DEPDIR)/test_erase_directories.Po
+	-rm -f ./$(DEPDIR)/test_exact_search_by_extent.Po
+	-rm -f ./$(DEPDIR)/test_exact_search_by_point.Po
+	-rm -f ./$(DEPDIR)/test_forced_reinsertion.Po
+	-rm -f ./$(DEPDIR)/test_geometry.Po
+	-rm -f ./$(DEPDIR)/test_intersection.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f ./$(DEPDIR)/test_move.Po
+	-rm -f ./$(DEPDIR)/test_node_split.Po
+	-rm -f ./$(DEPDIR)/test_point_objects.Po
+	-rm -f ./$(DEPDIR)/test_square_distance.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/rtree/test_basic.cpp b/test/rtree/test_basic.cpp
new file mode 100644
index 0000000..4dd3354
--- /dev/null
+++ b/test/rtree/test_basic.cpp
@@ -0,0 +1,148 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_basic_search()
+{
+    stack_printer __stack_printer__("::rtree_test_basic_search");
+    using rt_type = rtree<int16_t, std::string>;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    rt_type::extent_type expected_bb;
+
+    tree.insert({{0, 0}, {2, 2}}, "test");
+    expected_bb = {{0, 0}, {2, 2}};
+    assert(tree.extent() == expected_bb);
+    assert(tree.size() == 1);
+
+    tree.insert({{3, 3}, {5, 5}}, "test again");
+    expected_bb = {{0, 0}, {5, 5}};
+    assert(tree.extent() == expected_bb);
+    assert(tree.size() == 2);
+
+    tree.insert({{-2, 1}, {3, 6}}, "more test");
+    expected_bb = {{-2, 0}, {5, 6}};
+    assert(tree.extent() == expected_bb);
+    assert(tree.size() == 3);
+
+    tree.check_integrity(check_props);
+
+    // Verify the search method works.
+
+    rt_type::const_search_results res = ctree.search({1, 1}, search_type::overlap);
+
+    auto it = res.cbegin(), it_end = res.cend();
+
+    size_t n = std::distance(it, it_end);
+    assert(n == 2);
+
+    std::unordered_map<std::string, rt_type::extent_type> expected_values = {
+        {"test", {{0, 0}, {2, 2}}},
+        {"more test", {{-2, 1}, {3, 6}}},
+    };
+
+    for (; it != it_end; ++it)
+    {
+        cout << "bounding box: " << it.extent().to_string() << "; value: " << *it << "; depth: " << it.depth() << endl;
+        auto itv = expected_values.find(*it);
+        assert(itv != expected_values.end());
+        assert(itv->second == it.extent());
+        assert(it.depth() == 1);
+    }
+
+    // Perform an out-of-bound search by point.
+    std::vector<rt_type::point_type> pts = {
+        {-10, -10},
+        {1, 7},
+        {6, 3},
+    };
+
+    for (const rt_type::point_type& pt : pts)
+    {
+        res = ctree.search(pt, search_type::overlap);
+        assert(res.cbegin() == res.cend());
+    }
+}
+
+void rtree_test_basic_erase()
+{
+    stack_printer __stack_printer__("::rtree_test_basic_erase");
+    using rt_type = rtree<int16_t, std::string>;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    tree.insert({{-2, -2}, {2, 2}}, "erase me");
+    assert(!tree.empty());
+    assert(tree.size() == 1);
+
+    rt_type::const_search_results res = ctree.search({0, 0}, search_type::overlap);
+
+    size_t n = std::distance(res.begin(), res.end());
+    assert(n == 1);
+
+    rt_type::const_iterator it = res.begin();
+    assert(it != res.end());
+
+    tree.erase(it);
+    assert(tree.empty());
+    assert(tree.size() == 0);
+    assert(rt_type::extent_type() == tree.extent());
+
+    tree.insert({{0, 0}, {2, 2}}, "erase me");
+    tree.insert({{-10, -4}, {0, 0}}, "erase me");
+    rt_type::extent_type expected_bb({-10, -4}, {2, 2});
+    assert(tree.extent() == expected_bb);
+    assert(tree.size() == 2);
+
+    res = ctree.search({-5, -2}, search_type::overlap);
+    n = std::distance(res.begin(), res.end());
+    assert(n == 1);
+    it = res.begin();
+    tree.erase(it);
+    assert(!tree.empty()); // there should be one value stored in the tree.
+    assert(tree.size() == 1);
+    expected_bb = {{0, 0}, {2, 2}};
+    assert(tree.extent() == expected_bb);
+
+    tree.check_integrity(check_props);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_bulkload_main.cpp b/test/rtree/test_bulkload_main.cpp
new file mode 100644
index 0000000..8295c29
--- /dev/null
+++ b/test/rtree/test_bulkload_main.cpp
@@ -0,0 +1,281 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+#include <vector>
+#include <fstream>
+#include <unordered_map>
+
+using namespace mdds;
+using namespace std;
+
+void rtree_test_bl_empty()
+{
+    stack_printer __stack_printer__("::rtree_test_bl_empty");
+    using rt_type = rtree<int16_t, std::string>;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    // Load nothing.
+    rt_type::bulk_loader loader;
+    rt_type tree = loader.pack();
+    assert(tree.empty());
+    tree.check_integrity(check_props);
+}
+
+void rtree_test_bl_insert_points_move()
+{
+    stack_printer __stack_printer__("::rtree_test_bl_insert_points_move");
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d_forced_reinsertion>;
+    using key_type = rt_type::key_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    rt_type::bulk_loader loader;
+    for (key_type x = 0; x < 20; ++x)
+    {
+        key_type yn = (x == 0) ? 19 : 20;
+        for (key_type y = 0; y < yn; ++y)
+        {
+            std::ostringstream os;
+            os << '(' << x << ',' << y << ')';
+            loader.insert({x, y}, os.str());
+        }
+    }
+
+    auto tree = loader.pack();
+    assert(tree.size() == 399);
+    tree.check_integrity(check_props);
+    export_tree(tree, "rtree-test-bl-insert-points-move");
+}
+
+void rtree_test_bl_insert_points_copy()
+{
+    stack_printer __stack_printer__("::rtree_test_bl_insert_points_copy");
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d_forced_reinsertion>;
+    using point_type = rt_type::point_type;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    struct kv
+    {
+        point_type point;
+        std::string value;
+    };
+
+    std::vector<kv> values = {
+        {{0, 0}, "origin"},        {{125, 125}, "middle"},  {{22, 987}, "somewhere"},
+        {{-34, -200}, "negative"}, {{2, 3}, "near origin"},
+    };
+
+    // Insert less than max node size in order to test the packing
+    // implementation that doesn't involve per-level packing.
+    tiny_trait_2d_forced_reinsertion t;
+    assert(values.size() <= t.max_node_size);
+
+    for (size_t n_values = 1; n_values <= values.size(); ++n_values)
+    {
+        auto loader = rt_type::bulk_loader();
+
+        // Insert specified number of value(s).
+        for (size_t i = 0; i < n_values; ++i)
+            loader.insert(values[i].point, values[i].value);
+
+        // Populate and pack the tree.
+        auto tree = loader.pack();
+        tree.check_integrity(check_props);
+        assert(tree.size() == n_values);
+
+        // Make sure the inserted values are all there.
+        for (size_t i = 0; i < n_values; ++i)
+        {
+            auto res = tree.search(values[i].point, search_type::match);
+            assert(std::distance(res.begin(), res.end()) == 1);
+            auto it = res.begin();
+            assert(*it == values[i].value);
+
+            // The values should all be the immediate children of the root
+            // directory node.
+            assert(it.depth() == 1);
+        }
+    }
+}
+
+void rtree_test_bl_insert_extents_move()
+{
+    stack_printer __stack_printer__("::rtree_test_bl_insert_extents_move");
+    using rt_type = rtree<int16_t, only_movable, tiny_trait_2d_forced_reinsertion>;
+    using extent_type = rt_type::extent_type;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    struct kv
+    {
+        int16_t x;
+        int16_t y;
+        int16_t w;
+        int16_t h;
+        double value;
+    };
+
+    std::vector<kv> values = {
+        {2142, 2777, 1781, 1273, 1.0},   {5063, 2396, 765, 1019, 1.1},   {1887, 4935, 1400, 892, 1.2},
+        {4428, 4046, 1527, 1146, 1.3},   {2268, 6713, 1146, 2162, 1.4},  {7729, 7094, 2924, 1908, 1.5},
+        {10396, 2014, 6480, 892, 1.6},   {3158, 12302, 2035, 2289, 1.7}, {10777, 11032, 3432, 2289, 1.8},
+        {14334, 5063, 1781, 2797, 1.9},  {8365, 4301, 3051, 1019, 2.0},  {16619, 11794, 638, 511, 2.1},
+        {15222, 9254, 892, 511, 2.2},    {8111, 10142, 765, 638, 2.3},   {6587, 10397, 765, 511, 2.4},
+        {7475, 11793, 638, 1146, 2.5},   {8746, 11285, 765, 892, 2.6},   {16620, 3665, 511, 2162, 2.7},
+        {6332, 14714, 2162, 1908, 2.8},  {1634, 12048, 765, 5083, 2.9},  {15349, 16238, 1400, 1400, 3.0},
+        {11666, 14587, 1400, 1146, 3.1},
+    };
+
+    for (size_t n_values = 5; n_values <= values.size(); ++n_values)
+    {
+        rt_type::bulk_loader loader = rt_type::bulk_loader();
+
+        for (size_t i = 0; i < n_values; ++i)
+        {
+            const auto& v = values[i];
+            extent_type extent{{v.x, v.y}, {int16_t(v.x + v.w), int16_t(v.y + v.h)}};
+            only_movable vv(v.value);
+
+            loader.insert(extent, std::move(vv));
+        }
+
+        auto tree = loader.pack();
+        assert(tree.size() == n_values);
+        tree.check_integrity(check_props);
+
+        // Make sure the values are all there.
+        for (size_t i = 0; i < n_values; ++i)
+        {
+            const auto& v = values[i];
+            extent_type extent{{v.x, v.y}, {int16_t(v.x + v.w), int16_t(v.y + v.h)}};
+            auto res = tree.search(extent, search_type::match);
+            assert(std::distance(res.begin(), res.end()) == 1);
+            assert(res.begin()->get() == v.value);
+        }
+
+        if (n_values == values.size())
+            export_tree(tree, "rtree-test-bl-insert-extents-move");
+    }
+}
+
+void rtree_test_bl_insert_extents_copy()
+{
+    stack_printer __stack_printer__("::rtree_test_bl_insert_extents_copy");
+    using rt_type = rtree<int16_t, only_copyable, tiny_trait_2d_forced_reinsertion>;
+    using extent_type = rt_type::extent_type;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    struct kv
+    {
+        int16_t x;
+        int16_t y;
+        int16_t w;
+        int16_t h;
+        double value;
+    };
+
+    std::vector<kv> values = {
+        {2142, 2777, 1781, 1273, 1.0},   {5063, 2396, 765, 1019, 1.1},    {1887, 4935, 1400, 892, 1.2},
+        {4428, 4046, 1527, 1146, 1.3},   {2268, 6713, 1146, 2162, 1.4},   {7729, 7094, 2924, 1908, 1.5},
+        {10396, 2014, 6480, 892, 1.6},   {2904, 11286, 2035, 2289, 1.7},  {11412, 10524, 3432, 2289, 1.8},
+        {14334, 5063, 1781, 2797, 1.9},  {8365, 4301, 3051, 1019, 2.0},   {16619, 11794, 638, 511, 2.1},
+        {15222, 9254, 892, 511, 2.2},    {8111, 10142, 765, 638, 2.3},    {6587, 10397, 765, 511, 2.4},
+        {7475, 11793, 638, 1146, 2.5},   {8746, 11285, 765, 892, 2.6},    {16620, 3665, 511, 2162, 2.7},
+        {1760, 17762, 2162, 1908, 2.8},  {1634, 12048, 765, 5083, 2.9},   {15349, 16238, 1400, 1400, 3.0},
+        {11793, 13190, 1400, 1146, 3.1}, {4174, 6078, 1019, 638, 3.2},    {13191, 3412, 1781, 257, 3.3},
+        {6714, 11413, 511, 765, 3.4},    {2903, 14969, 892, 511, 3.5},    {3919, 16366, 638, 511, 3.6},
+        {4554, 15222, 892, 638, 3.7},    {2904, 16238, 511, 892, 3.8},    {1507, 20557, 6099, 257, 3.9},
+        {4047, 7221, 1273, 384, 4.0},    {12301, 3538, 638, 1908, 4.1},   {12174, 6460, 1146, 511, 4.2},
+        {13318, 4046, 1273, 384, 4.3},   {16620, 6459, 1019, 638, 4.4},   {14080, 8238, 511, 765, 4.5},
+        {8365, 12555, 765, 384, 4.6},    {16493, 7349, 511, 511, 4.7},    {7603, 11031, 511, 384, 4.8},
+        {13571, 13191, 638, 1527, 4.9},  {15858, 13826, 2035, 2035, 5.0}, {7094, 1380, 892, 3305, 5.1},
+        {7094, 6332, 1400, 1400, 5.2},   {10142, 8237, 2162, 384, 5.3},   {13444, 9761, 4, 130, 5.4},
+    };
+
+    for (size_t n_values = 22; n_values <= values.size(); ++n_values)
+    {
+        rt_type::bulk_loader loader = rt_type::bulk_loader();
+
+        for (size_t i = 0; i < n_values; ++i)
+        {
+            const auto& v = values[i];
+            extent_type extent{{v.x, v.y}, {int16_t(v.x + v.w), int16_t(v.y + v.h)}};
+            only_copyable vv(v.value);
+
+            loader.insert(extent, vv);
+        }
+
+        auto tree = loader.pack();
+        assert(tree.size() == n_values);
+        tree.check_integrity(check_props);
+
+        // Make sure the values are all there.
+        for (size_t i = 0; i < n_values; ++i)
+        {
+            const auto& v = values[i];
+            extent_type extent{{v.x, v.y}, {int16_t(v.x + v.w), int16_t(v.y + v.h)}};
+            auto res = tree.search(extent, search_type::match);
+            assert(std::distance(res.begin(), res.end()) == 1);
+            assert(res.begin()->get() == v.value);
+        }
+
+        if (n_values == values.size())
+            export_tree(tree, "rtree-test-bl-insert-extents-copy");
+    }
+}
+
+int main()
+{
+    try
+    {
+        rtree_test_bl_empty();
+        rtree_test_bl_insert_points_move();
+        rtree_test_bl_insert_points_copy();
+        rtree_test_bl_insert_extents_move();
+        rtree_test_bl_insert_extents_copy();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_copy.cpp b/test/rtree/test_copy.cpp
new file mode 100644
index 0000000..dd4e5a9
--- /dev/null
+++ b/test/rtree/test_copy.cpp
@@ -0,0 +1,147 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_copy()
+{
+    stack_printer __stack_printer__("::rtree_test_copy");
+
+    using rt_type = rtree<double, double, tiny_trait_2d_forced_reinsertion>;
+    using point_type = rt_type::point_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    struct input
+    {
+        point_type start;
+        point_type end;
+        double value;
+    };
+
+    std::vector<input> inputs = {
+        {{0.0, 0.0}, {1.0, 1.0}, 1.0},    {{2.0, 2.0}, {2.1, 2.1}, 2.4},    {{100.0, 80.0}, {101.0, 85.0}, 100.0},
+        {{1.0, 75.0}, {2.0, 78.0}, 65.0}, {{1.0, 80.0}, {2.0, 82.0}, 68.0}, {{1.2, 1.0}, {2.2, 1.5}, 2.1},
+        {{2.2, 2.2}, {2.3, 2.4}, 3.5},    {{3.0, 3.0}, {3.3, 3.4}, 3.8},    {{4.0, 4.0}, {8.3, 12.4}, 13.8},
+        {{3.0, 5.0}, {4.3, 11.4}, 13.9},
+    };
+
+    rt_type tree;
+    for (const input& i : inputs)
+        tree.insert({i.start, i.end}, double(i.value));
+
+    auto copied(tree);
+
+    tree.check_integrity(check_props);
+    copied.check_integrity(check_props);
+
+    std::string str_src = tree.export_tree(rt_type::export_tree_type::formatted_node_properties);
+    std::string str_dst = tree.export_tree(rt_type::export_tree_type::formatted_node_properties);
+
+    assert(!str_src.empty() && str_src == str_dst);
+
+    // Test the "copy via assignment" scenario too.
+    auto copied_via_assign = tree;
+    copied_via_assign.check_integrity(check_props);
+    str_dst = copied_via_assign.export_tree(rt_type::export_tree_type::formatted_node_properties);
+
+    assert(!str_src.empty() && str_src == str_dst);
+}
+
+/**
+ * Make sure the rtree works with values that are only copyable (i.e. not
+ * movable).
+ */
+void rtree_test_only_copyable()
+{
+    stack_printer __stack_printer__("::rtree_test_only_copyable");
+
+    using rt_type = rtree<float, only_copyable, tiny_trait_2d_forced_reinsertion>;
+    using search_type = rt_type::search_type;
+    using extent_type = rt_type::extent_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    only_copyable v(11.2);
+    tree.insert({{0, 0}, {2, 5}}, v);
+    v.set(12.5);
+    tree.insert({9, 9}, v);
+
+    tree.check_integrity(check_props);
+
+    {
+        // Immutable search.
+        auto cres = ctree.search({1, 1}, search_type::overlap);
+        assert(std::distance(cres.begin(), cres.end()) == 1);
+        assert(cres.begin()->get() == 11.2);
+
+        cres = ctree.search({9, 9}, search_type::overlap);
+        assert(std::distance(cres.cbegin(), cres.cend()) == 1);
+        assert(cres.cbegin()->get() == 12.5);
+    }
+
+    {
+        // Mutable search
+        auto res = tree.search({9, 9}, search_type::match);
+        assert(std::distance(res.begin(), res.end()) == 1);
+        assert(res.begin()->get() == 12.5);
+        auto it = res.begin();
+        (*it).set(34.5);
+
+        res = tree.search({9, 9}, search_type::match);
+        assert(std::distance(res.begin(), res.end()) == 1);
+        assert(res.begin()->get() == 34.5);
+    }
+
+    {
+        // Erase the only object via mutable iterator.
+        assert(tree.size() == 2);
+        rt_type::search_results res = tree.search({{0, 0}, {100, 100}}, search_type::overlap);
+        assert(std::distance(res.begin(), res.end()) == 2);
+
+        res = tree.search({9, 9}, search_type::match);
+        assert(std::distance(res.begin(), res.end()) == 1);
+        tree.erase(res.begin());
+
+        assert(tree.size() == 1);
+        res = tree.search({{0, 0}, {100, 100}}, search_type::overlap);
+        assert(std::distance(res.begin(), res.end()) == 1);
+        auto it = res.begin();
+        assert(it.extent() == extent_type({{0, 0}, {2, 5}}));
+        assert(it->get() == 11.2);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_directory_node_split.cpp b/test/rtree/test_directory_node_split.cpp
new file mode 100644
index 0000000..8f851a0
--- /dev/null
+++ b/test/rtree/test_directory_node_split.cpp
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_directory_node_split()
+{
+    stack_printer __stack_printer__("::rtree_test_directory_node_split");
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d>;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    using point = rt_type::point_type;
+    using bounding_box = rt_type::extent_type;
+
+    for (int16_t x = 0; x < 10; ++x)
+    {
+        for (int16_t y = 0; y < 10; ++y)
+        {
+            std::ostringstream os;
+            os << "(x=" << x << ",y=" << y << ")";
+            std::string v = os.str();
+            int16_t xe = x + 1, ye = y + 1;
+            point s({x, y}), e({xe, ye});
+            bounding_box bb(s, e);
+            cout << "Inserting value '" << v << "' to {" << bb.to_string() << "} ..." << endl;
+            tree.insert({s, e}, std::move(v));
+            tree.check_integrity(check_props);
+        }
+    }
+
+    assert(tree.size() == 100);
+
+    // All value nodes in this tree should be at depth 4 (root having the
+    // depth of 0).  Just check a few of them.
+
+    std::vector<point> pts = {
+        {5, 5},
+        {2, 3},
+        {7, 9},
+    };
+
+    for (const point& pt : pts)
+    {
+        auto res = ctree.search(pt, search_type::overlap);
+        auto it = res.cbegin();
+        assert(it != res.cend());
+        assert(it.depth() == 4);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_erase_directories.cpp b/test/rtree/test_erase_directories.cpp
new file mode 100644
index 0000000..c753a1e
--- /dev/null
+++ b/test/rtree/test_erase_directories.cpp
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_erase_directories()
+{
+    stack_printer __stack_printer__("::rtree_test_erase_directories");
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d>;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    using point = rt_type::point_type;
+    using bounding_box = rt_type::extent_type;
+
+    for (int16_t x = 0; x < 5; ++x)
+    {
+        for (int16_t y = 0; y < 5; ++y)
+        {
+            std::ostringstream os;
+            int16_t x2 = x * 2;
+            int16_t y2 = y * 2;
+            os << "(x=" << x2 << ",y=" << y2 << ")";
+            std::string v = os.str();
+            int16_t xe = x2 + 2, ye = y2 + 2;
+            point s({x2, y2}), e({xe, ye});
+            bounding_box bb(s, e);
+            tree.insert({s, e}, std::move(v));
+        }
+    }
+
+    assert(tree.size() == 25);
+    tree.check_integrity(check_props);
+    cout << tree.export_tree(rt_type::export_tree_type::formatted_node_properties) << endl;
+
+    size_t expected_size = 25;
+
+    for (int16_t x = 0; x < 5; ++x)
+    {
+        for (int16_t y = 0; y < 5; ++y)
+        {
+            int16_t x2 = x * 2 + 1;
+            int16_t y2 = y * 2 + 1;
+
+            cout << "erase at (" << x2 << ", " << y2 << ")" << endl;
+
+            auto res = ctree.search({x2, y2}, search_type::overlap);
+            auto it = res.begin(), ite = res.end();
+            size_t n = std::distance(it, ite);
+            assert(n == 1);
+
+            tree.erase(it);
+
+            assert(tree.size() == --expected_size);
+            tree.check_integrity(check_props);
+
+            res = ctree.search({x2, y2}, search_type::overlap);
+            n = std::distance(res.begin(), res.end());
+            assert(n == 0);
+        }
+    }
+
+    assert(tree.empty());
+    assert(tree.size() == 0);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_exact_search_by_extent.cpp b/test/rtree/test_exact_search_by_extent.cpp
new file mode 100644
index 0000000..dfcde7c
--- /dev/null
+++ b/test/rtree/test_exact_search_by_extent.cpp
@@ -0,0 +1,85 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_exact_search_by_extent()
+{
+    stack_printer __stack_printer__("::rtree_test_exact_search_by_extent");
+
+    using rt_type = rtree<double, double, tiny_trait_2d_forced_reinsertion>;
+    using extent_type = rt_type::extent_type;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    tree.insert({{0, 0}, {2, 2}}, 1.1);
+    tree.insert({{1, 1}, {3, 3}}, 1.2);
+    tree.insert({{2, 2}, {4, 4}}, 1.3);
+    tree.check_integrity(check_props);
+
+    {
+        // Immutable search
+        rt_type::const_search_results cres = ctree.search({{1, 1}, {3, 3}}, search_type::overlap);
+        size_t n = std::distance(cres.begin(), cres.end());
+        assert(n == 3);
+
+        cres = ctree.search({{1, 1}, {3, 3}}, search_type::match);
+        n = std::distance(cres.begin(), cres.end());
+        assert(n == 1);
+        auto it = cres.cbegin();
+        assert(*it == 1.2);
+        assert(it.extent() == extent_type({{1, 1}, {3, 3}}));
+        assert(it.depth() == 1);
+    }
+
+    {
+        // Mutable search
+        rt_type::search_results res = tree.search({{1, 1}, {3, 3}}, search_type::overlap);
+        size_t n = std::distance(res.begin(), res.end());
+        assert(n == 3);
+
+        // Modify the values.
+        for (double& v : res)
+            v += 1.0;
+
+        res = tree.search({{1, 1}, {3, 3}}, search_type::match);
+        n = std::distance(res.begin(), res.end());
+        assert(n == 1);
+        assert(*res.begin() == 2.2); // The value should be updated.
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_exact_search_by_point.cpp b/test/rtree/test_exact_search_by_point.cpp
new file mode 100644
index 0000000..a40852c
--- /dev/null
+++ b/test/rtree/test_exact_search_by_point.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_exact_search_by_point()
+{
+    stack_printer __stack_printer__("::rtree_test_exact_search_by_point");
+
+    using rt_type = rtree<double, double, tiny_trait_2d_forced_reinsertion>;
+    using point_type = rt_type::point_type;
+    using extent_type = rt_type::extent_type;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+    tree.insert({{0, 0}, {4, 4}}, 10.0);
+    tree.insert({1, 1}, 11.0);
+    tree.insert({3, 3}, 33.0);
+    tree.check_integrity(check_props);
+
+    rt_type::const_search_results res = ctree.search({1, 1}, search_type::overlap);
+    size_t n = std::distance(res.begin(), res.end());
+    assert(n == 2);
+
+    res = ctree.search({3, 3}, search_type::overlap);
+    n = std::distance(res.begin(), res.end());
+    assert(n == 2);
+
+    res = ctree.search({2, 2}, search_type::overlap);
+    n = std::distance(res.begin(), res.end());
+    assert(n == 1);
+    rt_type::const_iterator it = res.begin();
+    assert(*it == 10.0);
+    assert(it.extent() == extent_type({{0, 0}, {4, 4}}));
+
+    res = ctree.search({1, 1}, search_type::match);
+    n = std::distance(res.begin(), res.end());
+    assert(n == 1);
+    it = res.begin();
+    assert(*it == 11.0);
+    assert(it.extent().is_point());
+    assert(it.extent().start == point_type({1, 1}));
+
+    res = ctree.search({3, 3}, search_type::match);
+    n = std::distance(res.begin(), res.end());
+    assert(n == 1);
+    it = res.begin();
+    assert(*it == 33.0);
+    assert(it.extent().is_point());
+    assert(it.extent().start == point_type({3, 3}));
+
+    res = ctree.search({{0, 0}, {4, 4}}, search_type::match);
+    n = std::distance(res.begin(), res.end());
+    assert(n == 1);
+    it = res.begin();
+    assert(*it == 10.0);
+    assert(it.extent() == extent_type({{0, 0}, {4, 4}}));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_forced_reinsertion.cpp b/test/rtree/test_forced_reinsertion.cpp
new file mode 100644
index 0000000..a23e29a
--- /dev/null
+++ b/test/rtree/test_forced_reinsertion.cpp
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_forced_reinsertion()
+{
+    stack_printer __stack_printer__("::rtree_test_forced_reinsertion");
+
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d_forced_reinsertion>;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    rt_type tree;
+
+    for (int16_t i = 0; i < 6; ++i)
+    {
+        int16_t w = 1;
+        std::ostringstream os;
+        os << "foo" << i;
+        tree.insert({{i, i}, {int16_t(i + w), int16_t(i + w)}}, os.str());
+    }
+
+    assert(tree.size() == 6);
+    tree.check_integrity(check_props);
+
+    tree.clear();
+    assert(tree.empty());
+    assert(tree.size() == 0);
+    tree.check_integrity(check_props);
+
+    for (int16_t x = 0; x < 5; ++x)
+    {
+        for (int16_t y = 0; y < 5; ++y)
+        {
+            std::ostringstream os;
+            int16_t x2 = x * 2;
+            int16_t y2 = y * 2;
+            os << "(x=" << x2 << ",y=" << y2 << ")";
+            std::string v = os.str();
+            int16_t xe = x2 + 2, ye = y2 + 2;
+            tree.insert({{x2, y2}, {xe, ye}}, std::move(v));
+        }
+    }
+
+    tree.check_integrity(check_props);
+    assert(tree.size() == 25);
+
+    export_tree(tree, "rtree-test-forced-reinsertion");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_geometry.cpp b/test/rtree/test_geometry.cpp
new file mode 100644
index 0000000..77b89b1
--- /dev/null
+++ b/test/rtree/test_geometry.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_area_enlargement()
+{
+    stack_printer __stack_printer__("::rtree_test_area_enlargement");
+    using rt_type = rtree<int16_t, std::string>;
+    using bounding_box = rt_type::extent_type;
+    using mdds::detail::rtree::calc_area_enlargement;
+
+    struct check
+    {
+        bounding_box host;
+        bounding_box guest;
+        int16_t expected_area;
+    };
+
+    std::vector<check> checks = {
+        {{{0, 0}, {2, 2}}, {{2, 2}, {3, 3}}, 5}, // 3x3 - 2x2 = 5
+        {{{0, 0}, {2, 2}}, {{0, 1}, {1, 2}}, 0}, // no enlargement
+        {{{0, 0}, {3, 3}}, {{-3, 1}, {7, 2}}, 21}, // 10x3 - 3x3 = 21
+        {{{0, 0}, {0, 0}}, {{-1, -1}, {0, 0}}, 1}, // 1x1 = 1
+        {{{0, 0}, {1, 1}}, {{-4, -3}, {-3, -2}}, 19}, // 5x4 - 1x1 = 19
+    };
+
+    for (const check& c : checks)
+    {
+        int16_t area = calc_area_enlargement(c.host, c.guest);
+        assert(area == c.expected_area);
+    }
+}
+
+void rtree_test_center_point()
+{
+    stack_printer __stack_printer__("::rtree_test_center_point");
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d>;
+    using mdds::detail::rtree::get_center_point;
+    using extent_type = rt_type::extent_type;
+    using point_type = rt_type::point_type;
+
+    struct test_case
+    {
+        extent_type extent;
+        point_type expected;
+    };
+
+    std::vector<test_case> tcs = {
+        {{{0, 0}, {2, 2}}, {1, 1}},
+        {{{-2, -4}, {2, 4}}, {0, 0}},
+        {{{3, 5}, {8, 10}}, {5, 7}},
+    };
+
+    for (const test_case& tc : tcs)
+    {
+        cout << "extent: " << tc.extent.to_string() << endl;
+        auto pt = get_center_point(tc.extent);
+        assert(pt == tc.expected);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_global_rtree.hpp b/test/rtree/test_global_rtree.hpp
new file mode 100644
index 0000000..7819cda
--- /dev/null
+++ b/test/rtree/test_global_rtree.hpp
@@ -0,0 +1,148 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_MDDS_TEST_GLOBAL_RTREE_HPP
+#define INCLUDED_MDDS_TEST_GLOBAL_RTREE_HPP
+
+#define MDDS_RTREE_DEBUG 1
+#include <mdds/rtree.hpp>
+#include <fstream>
+
+struct tiny_trait_1d
+{
+    constexpr static size_t dimensions = 1;
+    constexpr static size_t min_node_size = 2;
+    constexpr static size_t max_node_size = 5;
+    constexpr static size_t max_tree_depth = 100;
+
+    constexpr static bool enable_forced_reinsertion = false;
+    constexpr static size_t reinsertion_size = 2;
+};
+
+struct tiny_trait_2d
+{
+    constexpr static size_t dimensions = 2;
+    constexpr static size_t min_node_size = 2;
+    constexpr static size_t max_node_size = 5;
+    constexpr static size_t max_tree_depth = 100;
+
+    constexpr static bool enable_forced_reinsertion = false;
+    constexpr static size_t reinsertion_size = 2;
+};
+
+struct tiny_trait_2d_forced_reinsertion
+{
+    constexpr static size_t dimensions = 2;
+    constexpr static size_t min_node_size = 2;
+    constexpr static size_t max_node_size = 5;
+    constexpr static size_t max_tree_depth = 100;
+
+    constexpr static bool enable_forced_reinsertion = true;
+    constexpr static size_t reinsertion_size = 2;
+};
+
+class only_movable
+{
+    double m_value;
+
+public:
+    only_movable() : m_value(0.0)
+    {}
+    only_movable(double v) : m_value(v)
+    {}
+    only_movable(const only_movable&) = delete;
+    only_movable(only_movable&& other) : m_value(other.m_value)
+    {
+        other.m_value = 0.0;
+    }
+
+    double get() const
+    {
+        return m_value;
+    }
+};
+
+class only_copyable
+{
+    double m_value;
+
+public:
+    only_copyable() : m_value(0.0)
+    {}
+    only_copyable(double v) : m_value(v)
+    {}
+    only_copyable(const only_copyable& other) : m_value(other.m_value)
+    {}
+
+    only_copyable(only_copyable&&) = delete;
+
+    void set(double v)
+    {
+        m_value = v;
+    }
+    double get() const
+    {
+        return m_value;
+    }
+};
+
+template<typename T>
+void export_tree(const T& tree, const std::string& basename)
+{
+    {
+        std::ofstream fout(basename + ".obj");
+        fout << tree.export_tree(T::export_tree_type::extent_as_obj);
+    }
+
+    {
+        std::ofstream fout(basename + ".svg");
+        fout << tree.export_tree(T::export_tree_type::extent_as_svg);
+    }
+}
+
+void rtree_test_intersection();
+void rtree_test_square_distance();
+void rtree_test_center_point();
+void rtree_test_area_enlargement();
+void rtree_test_basic_search();
+void rtree_test_basic_erase();
+void rtree_test_node_split();
+void rtree_test_directory_node_split();
+void rtree_test_erase_directories();
+void rtree_test_forced_reinsertion();
+void rtree_test_move();
+void rtree_test_move_custom_type();
+void rtree_test_copy();
+void rtree_test_point_objects();
+void rtree_test_only_copyable();
+void rtree_test_exact_search_by_extent();
+void rtree_test_exact_search_by_point();
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_intersection.cpp b/test/rtree/test_intersection.cpp
new file mode 100644
index 0000000..0cf5b93
--- /dev/null
+++ b/test/rtree/test_intersection.cpp
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_intersection()
+{
+    stack_printer __stack_printer__("::rtree_test_intersection");
+    using rt_type = rtree<int16_t, std::string>;
+    using bounding_box = rt_type::extent_type;
+    using mdds::detail::rtree::calc_intersection;
+    using mdds::detail::rtree::calc_linear_intersection;
+
+    struct check
+    {
+        bounding_box bb1;
+        bounding_box bb2;
+        int16_t expected_length1;
+        int16_t expected_length2;
+    };
+
+    std::vector<check> checks = {
+        // bounding box 1           bounding box 2
+        {{{0, 0}, {3, 6}}, {{1, 2}, {7, 5}}, 2, 3},       {{{3, 2}, {7, 10}}, {{1, 10}, {10, 11}}, 4, 0},
+        {{{3, 2}, {7, 10}}, {{1, 9}, {10, 11}}, 4, 1},    {{{3, 2}, {7, 6}}, {{5, 4}, {11, 8}}, 2, 2},
+        {{{-2, -8}, {2, -5}}, {{0, -10}, {8, -1}}, 2, 3}, {{{2, 2}, {20, 12}}, {{5, 6}, {16, 9}}, 11, 3},
+        {{{0, 0}, {6, 6}}, {{0, 0}, {2, 3}}, 2, 3},
+    };
+
+    for (const check& c : checks)
+    {
+        int16_t length1 = calc_linear_intersection<bounding_box>(0, c.bb1, c.bb2);
+        assert(length1 == c.expected_length1);
+        int16_t length2 = calc_linear_intersection<bounding_box>(1, c.bb1, c.bb2);
+        assert(length2 == c.expected_length2);
+
+        int16_t area = calc_intersection<bounding_box>(c.bb1, c.bb2);
+        int16_t expected_area = c.expected_length1 * c.expected_length2;
+        assert(area == expected_area);
+
+        // Swap the boxes and run the same tests. We should get the same results.
+
+        length1 = calc_linear_intersection<bounding_box>(0, c.bb2, c.bb1);
+        assert(length1 == c.expected_length1);
+        length2 = calc_linear_intersection<bounding_box>(1, c.bb2, c.bb1);
+        assert(length2 == c.expected_length2);
+
+        area = calc_intersection<bounding_box>(c.bb2, c.bb1);
+        assert(area == expected_area);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_main.cpp b/test/rtree/test_main.cpp
new file mode 100644
index 0000000..6e776a8
--- /dev/null
+++ b/test/rtree/test_main.cpp
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using namespace std;
+
+int main()
+{
+    try
+    {
+        rtree_test_intersection();
+        rtree_test_square_distance();
+        rtree_test_center_point();
+        rtree_test_area_enlargement();
+        rtree_test_basic_search();
+        rtree_test_basic_erase();
+        rtree_test_node_split();
+        rtree_test_directory_node_split();
+        rtree_test_erase_directories();
+        rtree_test_forced_reinsertion();
+        rtree_test_move();
+        rtree_test_move_custom_type();
+        rtree_test_copy();
+        rtree_test_point_objects();
+        rtree_test_only_copyable();
+        rtree_test_exact_search_by_extent();
+        rtree_test_exact_search_by_point();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_move.cpp b/test/rtree/test_move.cpp
new file mode 100644
index 0000000..1a81b82
--- /dev/null
+++ b/test/rtree/test_move.cpp
@@ -0,0 +1,134 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_move()
+{
+    stack_printer __stack_printer__("::rtree_test_move");
+
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d_forced_reinsertion>;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    rt_type tree;
+
+    for (int16_t x = 0; x < 5; ++x)
+    {
+        for (int16_t y = 0; y < 5; ++y)
+        {
+            std::ostringstream os;
+            int16_t x2 = x * 2;
+            int16_t y2 = y * 2;
+            os << "(x=" << x2 << ",y=" << y2 << ")";
+            std::string v = os.str();
+            int16_t xe = x2 + 2, ye = y2 + 2;
+            tree.insert({{x2, y2}, {xe, ye}}, std::move(v));
+        }
+    }
+
+    tree.check_integrity(check_props);
+    assert(tree.size() == 25);
+
+    // moved via constructor.
+    rt_type tree_moved(std::move(tree));
+    tree.check_integrity(check_props);
+    tree_moved.check_integrity(check_props);
+    assert(tree.empty());
+    assert(tree.size() == 0);
+    assert(tree_moved.size() == 25);
+
+    // moved via assignment operator.
+    rt_type tree_moved_2;
+    tree_moved_2.check_integrity(check_props);
+    tree_moved_2 = std::move(tree_moved);
+    tree_moved.check_integrity(check_props);
+    tree_moved_2.check_integrity(check_props);
+    assert(tree_moved.empty());
+    assert(tree_moved.size() == 0);
+    assert(tree_moved_2.size() == 25);
+}
+
+/**
+ * Make sure we can 1) store objects that are only movable but not copyable,
+ * and 2) the whole tree can still be moved.
+ */
+void rtree_test_move_custom_type()
+{
+    stack_printer __stack_printer__("::rtree_test_move_custom_type");
+
+    using rt_type = rtree<double, only_movable, tiny_trait_2d_forced_reinsertion>;
+    using point_type = rt_type::point_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    {
+        // Make sure you can actually move an object of this type.
+        only_movable v1(1.5);
+        only_movable v2(std::move(v1));
+    }
+
+    struct input
+    {
+        point_type start;
+        point_type end;
+        double value;
+    };
+
+    std::vector<input> inputs = {
+        {{0.0, 0.0}, {1.0, 1.0}, 1.0},    {{2.0, 2.0}, {2.1, 2.1}, 2.4},    {{100.0, 80.0}, {101.0, 85.0}, 100.0},
+        {{1.0, 75.0}, {2.0, 78.0}, 65.0}, {{1.0, 80.0}, {2.0, 82.0}, 68.0}, {{1.2, 1.0}, {2.2, 1.5}, 2.1},
+        {{2.2, 2.2}, {2.3, 2.4}, 3.5},    {{3.0, 3.0}, {3.3, 3.4}, 3.8},    {{4.0, 4.0}, {8.3, 12.4}, 13.8},
+        {{3.0, 5.0}, {4.3, 11.4}, 13.9},
+    };
+
+    rt_type tree;
+
+    for (const input& i : inputs)
+        tree.insert({i.start, i.end}, only_movable(i.value));
+
+    assert(tree.size() == inputs.size());
+
+    tree.check_integrity(check_props);
+
+    export_tree(tree, "rtree-test-move-custom-type");
+
+    // Now move the tree.
+    rt_type tree_moved = std::move(tree);
+    tree.check_integrity(check_props);
+    tree_moved.check_integrity(check_props);
+    assert(tree.empty());
+    assert(tree_moved.size() == inputs.size());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_node_split.cpp b/test/rtree/test_node_split.cpp
new file mode 100644
index 0000000..c09727a
--- /dev/null
+++ b/test/rtree/test_node_split.cpp
@@ -0,0 +1,140 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_node_split()
+{
+    stack_printer __stack_printer__("::rtree_test_node_split");
+    using rt_type = rtree<int16_t, std::string, tiny_trait_2d>;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = true;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+
+    // Inserting 6 entries should cause the root directory node to split.
+    // After the split, the root node should become a non-leaf directory
+    // storing two leaf directory nodes as its children.
+
+    for (int16_t i = 0; i < 6; ++i)
+    {
+        int16_t w = 1;
+        std::ostringstream os;
+        os << "foo" << i;
+        tree.insert({{i, i}, {int16_t(i + w), int16_t(i + w)}}, os.str());
+    }
+
+    assert(tree.size() == 6);
+
+    cout << tree.export_tree(rt_type::export_tree_type::formatted_node_properties) << endl;
+
+    size_t count_values = 0;
+    size_t count_leaf = 0;
+    size_t count_nonleaf = 0;
+
+    auto walker = [&](const rt_type::node_properties& np) {
+        switch (np.type)
+        {
+            case rt_type::node_type::value:
+                ++count_values;
+                break;
+            case rt_type::node_type::directory_leaf:
+                ++count_leaf;
+                break;
+            case rt_type::node_type::directory_nonleaf:
+                ++count_nonleaf;
+                break;
+            default:;
+        }
+    };
+
+    tree.walk(walker);
+
+    assert(count_values == 6);
+    assert(count_leaf == 2);
+    assert(count_nonleaf == 1);
+
+    tree.check_integrity(check_props);
+
+    // Adding two more entries will cause one of the leaf directory nodes
+    // below the root node to split.
+
+    for (int16_t i = 6; i < 8; ++i)
+    {
+        int16_t w = 1;
+        std::ostringstream os;
+        os << "bar" << i;
+        tree.insert({{i, i}, {int16_t(i + w), int16_t(i + w)}}, os.str());
+    }
+
+    assert(tree.size() == 8);
+    tree.check_integrity(check_props);
+
+    // Count all the nodes again.
+    count_values = 0;
+    count_leaf = 0;
+    count_nonleaf = 0;
+
+    tree.walk(walker);
+
+    assert(count_values == 8);
+    assert(count_leaf == 3);
+    assert(count_nonleaf == 1);
+
+    // Erase the entry at (0, 0).  There should be only one match.  Erasing
+    // this entry will cause the node to be underfilled.
+
+    rt_type::const_search_results res = ctree.search({0, 0}, search_type::overlap);
+    auto it = res.cbegin();
+    assert(it != res.cend());
+    assert(std::distance(it, res.cend()) == 1);
+    tree.erase(it);
+
+    assert(tree.size() == 7);
+    tree.check_integrity(check_props);
+
+    // Count all the nodes again.
+    count_values = 0;
+    count_leaf = 0;
+    count_nonleaf = 0;
+
+    tree.walk(walker);
+
+    assert(count_values == 7);
+    assert(count_leaf == 2);
+    assert(count_nonleaf == 1);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_point_objects.cpp b/test/rtree/test_point_objects.cpp
new file mode 100644
index 0000000..b2a3602
--- /dev/null
+++ b/test/rtree/test_point_objects.cpp
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_point_objects()
+{
+    stack_printer __stack_printer__("::rtree_test_point_objects");
+
+    using rt_type = rtree<double, double, tiny_trait_2d_forced_reinsertion>;
+    using key_type = rt_type::key_type;
+    using search_type = rt_type::search_type;
+    rt_type::integrity_check_properties check_props;
+    check_props.throw_on_first_error = false;
+
+    rt_type tree;
+    const rt_type& ctree = tree;
+
+    for (key_type x = 0; x < 10; ++x)
+    {
+        for (key_type y = 0; y < 10; ++y)
+        {
+            tree.insert({x, y}, x * y);
+        }
+    }
+
+    tree.check_integrity(check_props);
+
+    for (key_type x = 0; x < 10; ++x)
+    {
+        for (key_type y = 0; y < 10; ++y)
+        {
+            auto results = tree.search({x, y}, search_type::overlap);
+            assert(std::distance(results.begin(), results.end()) == 1);
+            double expected = x * y;
+            auto it = results.begin();
+            assert(expected == *it);
+        }
+    }
+
+    // Test an extent-based search on point data.
+    auto results = ctree.search({{0, 0}, {3, 3}}, search_type::overlap);
+    size_t n_results = std::distance(results.cbegin(), results.cend());
+    assert(n_results == 16);
+
+    export_tree(tree, "rtree-test-point-objects");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/rtree/test_square_distance.cpp b/test/rtree/test_square_distance.cpp
new file mode 100644
index 0000000..4ea80d3
--- /dev/null
+++ b/test/rtree/test_square_distance.cpp
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "test_global_rtree.hpp"
+
+using mdds::rtree;
+using std::cout;
+using std::endl;
+
+void rtree_test_square_distance()
+{
+    stack_printer __stack_printer__("::rtree_test_square_distance");
+    using mdds::detail::rtree::calc_square_distance;
+
+    {
+        // 1 dimensional unsigned
+        using rt_type = rtree<uint16_t, std::string, tiny_trait_1d>;
+        using point_type = rt_type::point_type;
+
+        struct test_case
+        {
+            point_type p1;
+            point_type p2;
+            uint16_t expected;
+        };
+
+        std::vector<test_case> tcs = {
+            {{3}, {5}, 4},
+            {{9}, {2}, 49},
+            {{0}, {0}, 0},
+        };
+
+        for (const test_case& tc : tcs)
+        {
+            cout << "p1: " << tc.p1.to_string() << "; p2: " << tc.p2.to_string() << endl;
+
+            uint16_t dist = calc_square_distance<point_type>(tc.p1, tc.p2);
+            assert(dist == tc.expected);
+
+            // Flip the value to make sure we still get the same result.
+            dist = calc_square_distance<point_type>(tc.p2, tc.p1);
+            assert(dist == tc.expected);
+        }
+    }
+
+    {
+        // 2 dimensional unsigned
+        using rt_type = rtree<uint16_t, std::string, tiny_trait_2d>;
+        using point_type = rt_type::point_type;
+
+        struct test_case
+        {
+            point_type p1;
+            point_type p2;
+            uint16_t expected;
+        };
+
+        std::vector<test_case> tcs = {
+            {{0, 0}, {0, 0}, 0},
+            {{0, 0}, {1, 1}, 2},
+            {{0, 0}, {2, 2}, 8},
+            {{3, 0}, {0, 4}, 25},
+        };
+
+        for (const test_case& tc : tcs)
+        {
+            cout << "p1: " << tc.p1.to_string() << "; p2: " << tc.p2.to_string() << endl;
+
+            uint16_t dist = calc_square_distance<point_type>(tc.p1, tc.p2);
+            assert(dist == tc.expected);
+
+            // Flip the value to make sure we still get the same result.
+            dist = calc_square_distance<point_type>(tc.p2, tc.p1);
+            assert(dist == tc.expected);
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/segment_tree/Makefile.am b/test/segment_tree/Makefile.am
new file mode 100644
index 0000000..b4927a7
--- /dev/null
+++ b/test/segment_tree/Makefile.am
@@ -0,0 +1,14 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = test-main
+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+TESTS = test-main
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/segment_tree/Makefile.in b/test/segment_tree/Makefile.in
new file mode 100644
index 0000000..97cc373
--- /dev/null
+++ b/test/segment_tree/Makefile.in
@@ -0,0 +1,990 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
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+
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+# developer- defined test setup AM_TESTS_ENVIRONMENT (if any), and
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+$(am__sh_e_setup);					\
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+srcdir=$(srcdir); export srcdir;			\
+case "$@" in						\
+  */*) am__odir=`echo "./$@" | sed 's|/[^/]*$$||'`;;	\
+    *) am__odir=.;; 					\
+esac;							\
+test "x$$am__odir" = x"." || test -d "$$am__odir" 	\
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+  am__enable_hard_errors=no; 				\
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+  *[\ \	]$$f[\ \	]* | *[\ \	]$$dir$$f[\ \	]*) \
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+  *)							\
+    am__expect_failure=no;;				\
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+AM_CPPFLAGS = \
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+test_main_SOURCES = \
+	test_main.cpp \
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+all: all-am
+
+.SUFFIXES:
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+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/segment_tree/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/segment_tree/Makefile
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+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
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+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
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+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	@$(MKDIR_P) $(top_builddir)/test
+	@: > $(top_builddir)/test/$(am__dirstamp)
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+	@$(MKDIR_P) $(top_builddir)/test/$(DEPDIR)
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+	$(top_builddir)/test/$(am__dirstamp) \
+	$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
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+test-main$(EXEEXT): $(test_main_OBJECTS) $(test_main_DEPENDENCIES) $(EXTRA_test_main_DEPENDENCIES) 
+	@rm -f test-main$(EXEEXT)
+	$(AM_V_CXXLD)$(CXXLINK) $(test_main_OBJECTS) $(test_main_LDADD) $(LIBS)
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+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+	-rm -f $(top_builddir)/test/*.$(OBJEXT)
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+distclean-compile:
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+ID: $(am__tagged_files)
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+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
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+	$(am__define_uniq_tagged_files); \
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+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
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+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
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+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
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+# Recover from deleted '.trs' file; this should ensure that
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+# both 'foo.log' and 'foo.trs'.  Break the recipe in two subshells
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+	rm -f $< $@
+	$(MAKE) $(AM_MAKEFLAGS) $<
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+	redo_bases=`for i in $$bases; do \
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+	            done`; \
+	if test -n "$$redo_bases"; then \
+	  redo_logs=`for i in $$redo_bases; do echo $$i.log; done`; \
+	  redo_results=`for i in $$redo_bases; do echo $$i.trs; done`; \
+	  if $(am__make_dryrun); then :; else \
+	    rm -f $$redo_logs && rm -f $$redo_results || exit 1; \
+	  fi; \
+	fi; \
+	if test -n "$$am__remaking_logs"; then \
+	  echo "fatal: making $(TEST_SUITE_LOG): possible infinite" \
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+	  am__remaking_logs=yes $(MAKE) $(AM_MAKEFLAGS) $$redo_logs; \
+	fi; \
+	if $(am__make_dryrun); then :; else \
+	  st=0;  \
+	  errmsg="fatal: making $(TEST_SUITE_LOG): failed to create"; \
+	  for i in $$redo_bases; do \
+	    test -f $$i.trs && test -r $$i.trs \
+	      || { echo "$$errmsg $$i.trs" >&2; st=1; }; \
+	    test -f $$i.log && test -r $$i.log \
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+	  done; \
+	  test $$st -eq 0 || exit 1; \
+	fi
+	@$(am__sh_e_setup); $(am__tty_colors); $(am__set_TESTS_bases); \
+	ws='[ 	]'; \
+	results=`for b in $$bases; do echo $$b.trs; done`; \
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+	all=`  grep "^$$ws*:test-result:"           $$results | wc -l`; \
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+	skip=` grep "^$$ws*:test-result:$$ws*SKIP"  $$results | wc -l`; \
+	xfail=`grep "^$$ws*:test-result:$$ws*XFAIL" $$results | wc -l`; \
+	xpass=`grep "^$$ws*:test-result:$$ws*XPASS" $$results | wc -l`; \
+	error=`grep "^$$ws*:test-result:$$ws*ERROR" $$results | wc -l`; \
+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
+	else \
+	  success=false; \
+	fi; \
+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
+	create_testsuite_report --maybe-color;				\
+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
+check-TESTS: $(check_PROGRAMS)
+	@list='$(RECHECK_LOGS)';           test -z "$$list" || rm -f $$list
+	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	trs_list=`for i in $$bases; do echo $$i.trs; done`; \
+	log_list=`echo $$log_list`; trs_list=`echo $$trs_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) TEST_LOGS="$$log_list"; \
+	exit $$?;
+recheck: all $(check_PROGRAMS)
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	bases=`for i in $$bases; do echo $$i; done \
+	         | $(am__list_recheck_tests)` || exit 1; \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	log_list=`echo $$log_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
+test-main.log: test-main$(EXEEXT)
+	@p='test-main$(EXEEXT)'; \
+	b='test-main'; \
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+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+check-valgrind-am: check-valgrind-local
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+	-rm -f ./$(DEPDIR)/test_main.Po
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+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/segment_tree/test_main.cpp b/test/segment_tree/test_main.cpp
new file mode 100644
index 0000000..c636a22
--- /dev/null
+++ b/test/segment_tree/test_main.cpp
@@ -0,0 +1,1136 @@
+/*************************************************************************
+ *
+ * Copyright (c) 2010, 2011 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+#include "mdds/segment_tree.hpp"
+
+#include <cstdlib>
+#include <cstdio>
+#include <iostream>
+#include <list>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#define ARRAY_SIZE(x) sizeof(x) / sizeof(x[0])
+
+using namespace std;
+using namespace mdds;
+
+template<typename key_type, typename value_type>
+void build_and_dump(segment_tree<key_type, value_type>& db)
+{
+    cout << "build and dump (start) -----------------------------------------" << endl;
+    db.build_tree();
+    db.dump_tree();
+    db.dump_leaf_nodes();
+    cout << "build and dump (end) -------------------------------------------" << endl;
+}
+
+struct test_data
+{
+    string name; // data structure expects the data to have 'name' data member.
+
+    test_data(const string& s) : name(s)
+    {}
+
+    struct ptr_printer
+    {
+        void operator()(const test_data* data) const
+        {
+            cout << data->name << " ";
+        }
+    };
+
+    /**
+     * Use this to sort instances of test_data by name, in ascending order.
+     */
+    struct sort_by_name
+    {
+        bool operator()(const test_data* left, const test_data* right) const
+        {
+            return left->name < right->name;
+        }
+    };
+
+    struct name_printer
+    {
+        void operator()(const test_data* p) const
+        {
+            cout << p->name << " ";
+        }
+    };
+};
+
+template<typename key_type, typename value_type>
+bool check_leaf_nodes(
+    const segment_tree<key_type, value_type>& db, const key_type* keys, value_type* data_chain, size_t key_size)
+{
+    typedef segment_tree<key_type, value_type> st_type;
+    vector<typename st_type::leaf_node_check> checks;
+    checks.reserve(key_size);
+    size_t dcid = 0;
+    for (size_t i = 0; i < key_size; ++i)
+    {
+        typename st_type::leaf_node_check c;
+        c.key = keys[i];
+        value_type p = data_chain[dcid];
+        while (p)
+        {
+            c.data_chain.push_back(p);
+            p = data_chain[++dcid];
+        }
+        checks.push_back(c);
+        ++dcid;
+    }
+
+    return db.verify_leaf_nodes(checks);
+}
+
+template<typename value_type>
+bool check_against_expected(const list<value_type>& test, value_type* expected)
+{
+    size_t i = 0;
+    value_type p = expected[i++];
+    typename list<value_type>::const_iterator itr = test.begin(), itr_end = test.end();
+    while (p)
+    {
+        if (itr == itr_end)
+            // data chain ended prematurely.
+            return false;
+
+        if (*itr != p)
+            // the value is not as expected.
+            return false;
+
+        p = expected[i++];
+        ++itr;
+    }
+    if (itr != itr_end)
+        // data chain is too long.
+        return false;
+
+    return true;
+}
+
+/**
+ * Only check the search result against expected result set.  The caller
+ * needs to run search and pass the result to this function.
+ */
+template<typename key_type, typename value_type>
+bool check_search_result_only(
+    const segment_tree<key_type, value_type>& /*db*/,
+    const typename segment_tree<key_type, value_type>::search_results_type& result, key_type key, value_type* expected)
+{
+    cout << "search key: " << key << " ";
+
+    list<value_type> test;
+    copy(result.begin(), result.end(), back_inserter(test));
+    test.sort(test_data::sort_by_name());
+
+    cout << "search result (sorted): ";
+    for_each(test.begin(), test.end(), test_data::name_printer());
+    cout << endl;
+
+    return check_against_expected(test, expected);
+}
+
+/**
+ * Run the search and check the search result.
+ */
+template<typename key_type, typename value_type>
+bool check_search_result(const segment_tree<key_type, value_type>& db, key_type key, value_type* expected)
+{
+    cout << "search key: " << key << " ";
+
+    typedef typename segment_tree<key_type, value_type>::search_results_type search_result_type;
+    search_result_type data_chain;
+    db.search(key, data_chain);
+    return check_search_result_only(db, data_chain, key, expected);
+}
+
+template<typename key_type, typename value_type>
+bool check_search_result_iterator(const segment_tree<key_type, value_type>& db, key_type key, value_type* expected)
+{
+    cout << "search key: " << key << " ";
+
+    typedef segment_tree<key_type, value_type> db_type;
+    typename db_type::search_results result = db.search(key);
+    list<value_type> test;
+    copy(result.begin(), result.end(), back_inserter(test));
+    test.sort(test_data::sort_by_name());
+
+    cout << "search result (sorted): ";
+    for_each(test.begin(), test.end(), test_data::name_printer());
+    cout << endl;
+
+    return check_against_expected(test, expected);
+}
+
+void st_test_insert_search_removal()
+{
+    stack_printer __stack_printer__("::st_test_insert_segments");
+
+    typedef long key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    db_type db;
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+
+    build_and_dump(db);
+    assert(db_type::node::get_instance_count() == 0);
+
+    db.insert(0, 10, &A);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 10};
+        value_type* data_chain[] = {&A, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+        assert(db.verify_node_lists());
+    }
+
+    db.insert(0, 5, &B);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 5, 10};
+        value_type* data_chain[] = {&A, &B, 0, &A, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+    }
+
+    db.insert(5, 12, &C);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 5, 10, 12};
+        value_type* data_chain[] = {&A, &B, 0, &A, &C, 0, &C, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+        assert(db.verify_node_lists());
+    }
+
+    db.insert(10, 24, &D);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 5, 10, 12, 24};
+        value_type* data_chain[] = {&A, &B, 0, &A, &C, 0, &C, &D, 0, &D, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+        assert(db.verify_node_lists());
+    }
+
+    db.insert(4, 24, &E);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 4, 5, 10, 12, 24};
+        value_type* data_chain[] = {&B, 0, &B, &E, 0, &A, &C, 0, &C, &D, 0, &D, &E, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+        assert(db.verify_node_lists());
+    }
+
+    db.insert(0, 26, &F);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 4, 5, 10, 12, 24, 26};
+        value_type* data_chain[] = {&B, 0, &B, &E, 0, &A, &C, 0, &C, &D, 0, &D, &E, &F, 0, &F, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+        assert(db.verify_node_lists());
+    }
+
+    db.insert(12, 26, &G);
+    build_and_dump(db);
+    {
+        key_type keys[] = {0, 4, 5, 10, 12, 24, 26};
+        value_type* data_chain[] = {&B, 0, &B, &E, 0, &A, &C, 0, &C, &D, 0, &D, &E, &F, &G, 0, &F, &G, 0, 0};
+        assert(check_leaf_nodes(db, keys, data_chain, ARRAY_SIZE(keys)));
+        assert(db_type::node::get_instance_count() == db.leaf_size());
+        assert(db.verify_node_lists());
+    }
+
+    // Search tests.  Test boundary cases.
+
+    for (key_type i = -10; i <= 30; ++i)
+    {
+        db_type::search_results_type data_chain;
+        db.search(i, data_chain);
+        cout << "search key " << i << ": ";
+        for_each(data_chain.begin(), data_chain.end(), test_data::ptr_printer());
+        cout << endl;
+    }
+
+    {
+        key_type key = -1;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 0;
+        value_type* expected[] = {&A, &B, &F, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 4;
+        value_type* expected[] = {&A, &B, &E, &F, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 5;
+        value_type* expected[] = {&A, &C, &E, &F, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 10;
+        value_type* expected[] = {&C, &D, &E, &F, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 12;
+        value_type* expected[] = {&D, &E, &F, &G, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 24;
+        value_type* expected[] = {&F, &G, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 30;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 9999;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    // Remove E, F and G and check search results.
+
+    db.remove(&E);
+    db.remove(&F);
+    db.remove(&G);
+    cout << "removed: E F G" << endl;
+    db.dump_tree();
+    db.dump_leaf_nodes();
+
+    for (key_type i = -10; i <= 30; ++i)
+    {
+        db_type::search_results_type data_chain;
+        db.search(i, data_chain);
+        cout << "search key " << i << ": ";
+        for_each(data_chain.begin(), data_chain.end(), test_data::ptr_printer());
+        cout << endl;
+    }
+
+    {
+        key_type key = -1;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 0;
+        value_type* expected[] = {&A, &B, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 4;
+        value_type* expected[] = {&A, &B, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 5;
+        value_type* expected[] = {&A, &C, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 10;
+        value_type* expected[] = {&C, &D, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 12;
+        value_type* expected[] = {&D, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 24;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 30;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 9999;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    // Re-build the tree and check the search results once again, to make sure
+    // we get the same results.
+
+    db.build_tree();
+    db.dump_tree();
+    db.dump_leaf_nodes();
+
+    {
+        key_type key = -1;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 0;
+        value_type* expected[] = {&A, &B, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 4;
+        value_type* expected[] = {&A, &B, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 5;
+        value_type* expected[] = {&A, &C, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 10;
+        value_type* expected[] = {&C, &D, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 12;
+        value_type* expected[] = {&D, 0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 24;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+
+    {
+        key_type key = 30;
+        value_type* expected[] = {0};
+        assert(check_search_result(db, key, expected));
+    }
+}
+
+void st_test_copy_constructor()
+{
+    stack_printer __stack_printer__("::st_test_copy_constructor");
+
+    typedef long key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    db_type db;
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+    vector<db_type::segment_data> segments;
+    segments.push_back(db_type::segment_data(0, 10, &A));
+    segments.push_back(db_type::segment_data(0, 5, &B));
+    segments.push_back(db_type::segment_data(5, 12, &C));
+    segments.push_back(db_type::segment_data(10, 24, &D));
+    segments.push_back(db_type::segment_data(4, 24, &E));
+    segments.push_back(db_type::segment_data(0, 26, &F));
+    segments.push_back(db_type::segment_data(12, 26, &G));
+    segments.push_back(db_type::segment_data(0, 0, nullptr)); // null-terminated
+
+    db_type::segment_map_type checks;
+    for (size_t i = 0; segments[i].pdata; ++i)
+    {
+        db.insert(segments[i].begin_key, segments[i].end_key, segments[i].pdata);
+        pair<key_type, key_type> range;
+        range.first = segments[i].begin_key;
+        range.second = segments[i].end_key;
+        checks.insert(db_type::segment_map_type::value_type(segments[i].pdata, range));
+    }
+
+    // Copy before the tree is built.
+
+    db.dump_segment_data();
+    assert(db.verify_segment_data(checks));
+
+    db_type db_copied(db);
+    db_copied.dump_segment_data();
+    assert(db_copied.verify_segment_data(checks));
+    assert(db.is_tree_valid() == db_copied.is_tree_valid());
+    assert(db == db_copied);
+
+    // Copy after the tree is built.
+    db.build_tree();
+    db_type db_copied_tree(db);
+    db_copied_tree.dump_segment_data();
+    db_copied_tree.dump_tree();
+    assert(db_copied_tree.verify_segment_data(checks));
+    assert(db.is_tree_valid() == db_copied_tree.is_tree_valid());
+    assert(db == db_copied_tree);
+}
+
+void st_test_equality()
+{
+    stack_printer __stack_printer__("::st_test_equality");
+
+    typedef uint32_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+    {
+        db_type db1, db2;
+        db1.insert(0, 10, &A);
+        db2.insert(0, 10, &A);
+        assert(db1 == db2);
+        db2.insert(5, 12, &B);
+        assert(db1 != db2);
+        db1.insert(5, 12, &C);
+        assert(db1 != db2);
+        db1.remove(&C);
+        db2.remove(&B);
+        assert(db1 == db2);
+        db1.insert(4, 20, &D);
+        db2.insert(4, 20, &D);
+        assert(db1 == db2);
+        db1.insert(3, 12, &E);
+        db2.insert(3, 15, &E);
+        assert(db1 != db2);
+    }
+}
+
+void st_test_clear()
+{
+    stack_printer __stack_printer__("::st_test_clear");
+
+    typedef uint8_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+
+    vector<db_type::segment_data> segments;
+    segments.push_back(db_type::segment_data(0, 10, &A));
+    segments.push_back(db_type::segment_data(0, 5, &B));
+    segments.push_back(db_type::segment_data(5, 12, &C));
+    segments.push_back(db_type::segment_data(10, 24, &D));
+    segments.push_back(db_type::segment_data(4, 24, &E));
+    segments.push_back(db_type::segment_data(0, 26, &F));
+    segments.push_back(db_type::segment_data(12, 26, &G));
+    segments.push_back(db_type::segment_data(0, 0, nullptr)); // null-terminated
+
+    db_type db;
+    for (size_t i = 0; segments[i].pdata; ++i)
+        db.insert(segments[i].begin_key, segments[i].end_key, segments[i].pdata);
+
+    assert(!db.empty());
+    assert(db.size() == 7);
+    cout << "size of db is " << db.size() << endl;
+
+    db.clear();
+    assert(db.empty());
+    assert(db.size() == 0);
+
+    // Insert the same data set once again, but this time build tree afterwards.
+    for (size_t i = 0; segments[i].pdata; ++i)
+        db.insert(segments[i].begin_key, segments[i].end_key, segments[i].pdata);
+
+    db.build_tree();
+    assert(!db.empty());
+    assert(db.size() == 7);
+
+    db.clear();
+    assert(db.empty());
+    assert(db.size() == 0);
+}
+
+void st_test_duplicate_insertion()
+{
+    stack_printer __stack_printer__("::st_test_duplicate_insertion");
+
+    typedef short key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+
+    db_type db;
+    assert(db.insert(0, 10, &A));
+    assert(!db.insert(0, 10, &A));
+    assert(!db.insert(2, 30, &A));
+    assert(db.insert(0, 10, &B));
+    db.remove(&A);
+    assert(db.insert(2, 30, &A));
+    build_and_dump(db);
+}
+
+/**
+ * When the number of segments is not a multiple of 2, it creates a tree
+ * where the right side becomes "cut off".  Make sure the search works
+ * correctly under those conditions.
+ */
+void st_test_search_on_uneven_tree()
+{
+    stack_printer __stack_printer__("::st_test_search_on_uneven_tree");
+
+    typedef int16_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    for (key_type data_count = 10; data_count < 20; ++data_count)
+    {
+        vector<unique_ptr<test_data>> data_store;
+        data_store.reserve(data_count);
+        for (key_type i = 0; i < data_count; ++i)
+        {
+            ostringstream os;
+            os << hex << showbase << i;
+            data_store.emplace_back(new test_data(os.str()));
+        }
+        assert(data_store.size() == static_cast<size_t>(data_count));
+
+        db_type db;
+        for (key_type i = 0; i < data_count; ++i)
+        {
+            test_data* p = data_store[i].get();
+            db.insert(0, i + 1, p);
+        }
+        assert(db.size() == static_cast<size_t>(data_count));
+
+        db.build_tree();
+
+        for (key_type i = -1; i < data_count + 1; ++i)
+        {
+            db_type::search_results_type result;
+            bool success = db.search(i, result);
+            assert(success);
+            cout << "search key: " << i << "  result: ";
+            for_each(result.begin(), result.end(), test_data::name_printer());
+            cout << endl;
+        }
+    }
+}
+
+void st_test_perf_insertion()
+{
+    stack_printer __stack_printer__("::st_test_perf_insertion");
+
+    typedef uint32_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    key_type data_count = 1000000;
+
+    // First, create test data instances and store them into a vector.
+    vector<unique_ptr<test_data>> data_store;
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: data array creation");
+        data_store.reserve(data_count);
+        for (key_type i = 0; i < data_count; ++i)
+        {
+            ostringstream os;
+            os << hex << i;
+            data_store.emplace_back(new test_data(os.str()));
+        }
+    }
+    assert(data_store.size() == data_count);
+
+    db_type db;
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: data array insertion into segment tree");
+        for (key_type i = 0; i < data_count; ++i)
+        {
+            test_data* p = data_store[i].get();
+            db.insert(0, i + 1, p);
+        }
+    }
+    assert(db.size() == data_count);
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: build tree");
+        db.build_tree();
+    }
+    assert(db.is_tree_valid());
+
+    const test_data* test = nullptr;
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 200 searches with max results");
+        for (key_type i = 0; i < 200; ++i)
+        {
+            db_type::search_results_type result;
+            db.search(0, result);
+            db_type::search_results_type::const_iterator itr = result.begin(), itr_end = result.end();
+            for (; itr != itr_end; ++itr)
+            {
+                test = *itr;
+                assert(test);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 200 searches with max results (iterator)");
+        for (key_type i = 0; i < 200; ++i)
+        {
+            db_type::search_results result = db.search(0);
+            db_type::search_results::iterator itr = result.begin(), itr_end = result.end();
+            for (; itr != itr_end; ++itr)
+            {
+                test = *itr;
+                assert(test);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 200 searches with median results");
+        for (key_type i = 0; i < 200; ++i)
+        {
+            db_type::search_results_type result;
+            db.search(data_count / 2, result);
+            db_type::search_results_type::const_iterator itr = result.begin(), itr_end = result.end();
+            for (; itr != itr_end; ++itr)
+            {
+                test = *itr;
+                assert(test);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 200 searches with median results (iterator)");
+        for (key_type i = 0; i < 200; ++i)
+        {
+            db_type::search_results result = db.search(data_count / 2);
+            db_type::search_results::iterator itr = result.begin(), itr_end = result.end();
+            for (; itr != itr_end; ++itr)
+            {
+                test = *itr;
+                assert(test);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 200 searches with empty results");
+        for (key_type i = 0; i < 200; ++i)
+        {
+            db_type::search_results_type result;
+            db.search(data_count, result);
+            db_type::search_results_type::const_iterator itr = result.begin(), itr_end = result.end();
+            for (; itr != itr_end; ++itr)
+            {
+                test = *itr;
+                assert(test);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 200 searches with empty results (iterator)");
+        for (key_type i = 0; i < 200; ++i)
+        {
+            db_type::search_results result = db.search(data_count);
+            db_type::search_results::iterator itr = result.begin(), itr_end = result.end();
+            for (; itr != itr_end; ++itr)
+            {
+                test = *itr;
+                assert(test);
+            }
+        }
+    }
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: 10000 segment removals");
+        for (key_type i = 0; i < 10000; ++i)
+        {
+            test_data* p = data_store[i].get();
+            db.remove(p);
+        }
+    }
+    assert(db.size() == data_count - 10000);
+
+    {
+        stack_printer __stack_printer2__("::st_test_perf_insertion:: clear");
+        db.clear();
+    }
+}
+
+void st_test_aggregated_search_results()
+{
+    stack_printer __stack_printer__("::st_test_aggregated_search_results");
+
+    typedef uint16_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+
+    vector<db_type::segment_data> segments;
+    segments.push_back(db_type::segment_data(0, 10, &A));
+    segments.push_back(db_type::segment_data(0, 5, &B));
+    segments.push_back(db_type::segment_data(5, 12, &C));
+    segments.push_back(db_type::segment_data(10, 24, &D));
+    segments.push_back(db_type::segment_data(4, 24, &E));
+    segments.push_back(db_type::segment_data(0, 26, &F));
+    segments.push_back(db_type::segment_data(12, 26, &G));
+    segments.push_back(db_type::segment_data(0, 0, nullptr)); // null-terminated
+
+    db_type db;
+    for (size_t i = 0; segments[i].pdata; ++i)
+        db.insert(segments[i].begin_key, segments[i].end_key, segments[i].pdata);
+
+    db.dump_segment_data();
+    db.build_tree();
+
+    db_type::search_results_type result;
+    {
+        key_type key = 0;
+        db.search(key, result);
+        value_type* expected[] = {&A, &B, &F, 0};
+        assert(check_search_result_only(db, result, key, expected));
+    }
+
+    {
+        key_type key = 10;
+        db.search(key, result);
+        // Note the duplicated F's in the search result.
+        value_type* expected[] = {&A, &B, &C, &D, &E, &F, &F, 0};
+        assert(check_search_result_only(db, result, key, expected));
+    }
+
+    {
+        key_type key = 5;
+        db.search(key, result);
+        value_type* expected[] = {&A, &A, &B, &C, &C, &D, &E, &E, &F, &F, &F, 0};
+        assert(check_search_result_only(db, result, key, expected));
+    }
+
+    {
+        result.clear(); // clear the accumulated result set.
+        key_type key = 5;
+        db.search(key, result);
+        value_type* expected[] = {&A, &C, &E, &F, 0};
+        assert(check_search_result_only(db, result, key, expected));
+    }
+}
+
+void st_test_dense_tree_search()
+{
+    stack_printer __stack_printer__("::st_test_dense_tree_search");
+
+    typedef uint16_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+    db_type db;
+    db.insert(0, 1, &A);
+    db.insert(0, 2, &B);
+    db.insert(0, 3, &C);
+    db.insert(0, 4, &D);
+    db.insert(0, 5, &E);
+    db.insert(0, 6, &F);
+    db.insert(0, 7, &G);
+    db.build_tree();
+    db.dump_tree();
+    db.dump_leaf_nodes();
+
+    {
+        db_type::value_type expected[] = {&A, &B, &C, &D, &E, &F, &G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 0, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {&B, &C, &D, &E, &F, &G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 1, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {&C, &D, &E, &F, &G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 2, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {&D, &E, &F, &G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 3, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {&E, &F, &G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 4, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {&F, &G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 5, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {&G, 0};
+        bool success = check_search_result<key_type, value_type*>(db, 6, expected);
+        assert(success);
+    }
+    {
+        db_type::value_type expected[] = {0};
+        bool success = check_search_result<key_type, value_type*>(db, 7, expected);
+        assert(success);
+    }
+}
+
+void st_test_search_on_empty_set()
+{
+    stack_printer __stack_printer__("::st_test_search_on_empty_set");
+
+    typedef uint16_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    db_type db;
+    db.build_tree();
+
+    // Search on an empty set should still be considered a success as long as
+    // the tree is built beforehand.
+    db_type::search_results_type result;
+    bool success = db.search(0, result);
+    assert(success);
+    assert(result.empty());
+}
+
+void st_test_search_iterator_basic()
+{
+    stack_printer __stack_printer__("::st_test_search_iterator");
+    typedef uint16_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+    db_type db;
+    db.insert(0, 1, &A);
+    db.insert(0, 2, &B);
+    db.insert(0, 3, &C);
+    db.insert(0, 4, &D);
+    db.insert(0, 5, &E);
+    db.insert(0, 6, &F);
+    db.insert(0, 7, &G);
+    db.build_tree();
+    db.dump_tree();
+    db.dump_leaf_nodes();
+
+    db_type::search_results result = db.search(0);
+    db_type::search_results::iterator itr;
+    db_type::search_results::iterator itr_beg = result.begin();
+    db_type::search_results::iterator itr_end = result.end();
+    cout << "Iterate through the search results." << endl;
+    for (itr = itr_beg; itr != itr_end; ++itr)
+        cout << (*itr)->name << " ";
+    cout << endl;
+
+    cout << "Do it again." << endl;
+    for (itr = itr_beg; itr != itr_end; ++itr)
+        cout << (*itr)->name << " ";
+    cout << endl;
+
+    cout << "Iterate backwards" << endl;
+    do
+    {
+        --itr;
+        cout << (*itr)->name << " ";
+    } while (itr != itr_beg);
+    cout << endl;
+
+    cout << "Get the last item from the end position." << endl;
+    itr = itr_end;
+    --itr;
+    cout << (*itr)->name << endl;
+
+    cout << "Use for_each to print names." << endl;
+    for_each(itr_beg, itr_end, test_data::ptr_printer());
+    cout << endl;
+}
+
+void st_test_search_iterator_result_check()
+{
+    stack_printer __stack_printer__("::st_test_search_iterator_result_check");
+
+    typedef uint16_t key_type;
+    typedef test_data value_type;
+    typedef segment_tree<key_type, value_type*> db_type;
+
+    value_type A("A"), B("B"), C("C"), D("D"), E("E"), F("F"), G("G");
+    db_type db;
+    db.insert(0, 1, &A);
+    db.insert(0, 2, &B);
+    db.insert(0, 3, &C);
+    db.insert(0, 4, &D);
+    db.insert(0, 5, &E);
+    db.insert(0, 6, &F);
+    db.insert(0, 7, &G);
+    db.build_tree();
+
+    {
+        value_type* expected[] = {&A, &B, &C, &D, &E, &F, &G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 0, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {&B, &C, &D, &E, &F, &G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 1, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {&C, &D, &E, &F, &G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 2, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {&D, &E, &F, &G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 3, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {&E, &F, &G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 4, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {&F, &G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 5, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {&G, 0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 6, expected);
+        assert(success);
+    }
+    {
+        value_type* expected[] = {0};
+        bool success = check_search_result_iterator<key_type, value_type*>(db, 7, expected);
+        assert(success);
+    }
+}
+
+/**
+ * When calling search() on empty tree, even without calling build_tree()
+ * should still return a valid search_result instance with a size of 0.
+ */
+void st_test_empty_result_set()
+{
+    stack_printer __stack_printer__("::st_test_empty_result_set");
+    typedef segment_tree<long, string*> db_type;
+    db_type db;
+    db_type::search_results result = db.search(0);
+    cout << "size of empty result set: " << result.size() << endl;
+    assert(result.size() == 0);
+}
+
+void st_test_non_pointer_data()
+{
+    stack_printer __stack_printer__("::st_test_non_pointer_data");
+
+    typedef uint16_t key_type;
+    typedef size_t value_type;
+    typedef segment_tree<key_type, value_type> db_type;
+
+    db_type db;
+    db.insert(0, 1, 10);
+    db.build_tree();
+
+    db_type::search_results result = db.search(0);
+    assert(result.size() == 1);
+    assert(*result.begin() == 10);
+}
+
+int main(int argc, char** argv)
+{
+    try
+    {
+        cmd_options opt;
+        if (!parse_cmd_options(argc, argv, opt))
+            return EXIT_FAILURE;
+
+        if (opt.test_func)
+        {
+            st_test_insert_search_removal();
+            st_test_copy_constructor();
+            st_test_equality();
+            st_test_clear();
+            st_test_duplicate_insertion();
+            st_test_search_on_uneven_tree();
+            st_test_aggregated_search_results();
+            st_test_dense_tree_search();
+            st_test_search_on_empty_set();
+            st_test_search_iterator_basic();
+            st_test_search_iterator_result_check();
+            st_test_empty_result_set();
+            st_test_non_pointer_data();
+        }
+
+        if (opt.test_perf)
+        {
+            st_test_perf_insertion();
+        }
+
+        // At this point, all of the nodes created during the test run should have
+        // been destroyed.  If not, we are leaking memory.
+        typedef segment_tree<uint32_t, void*> db_type;
+        assert(db_type::node::get_instance_count() == 0);
+    }
+    catch (const std::exception& e)
+    {
+        fprintf(stdout, "Test failed: %s\n", e.what());
+        return EXIT_FAILURE;
+    }
+    fprintf(stdout, "Test finished successfully!\n");
+    return EXIT_SUCCESS;
+}
diff --git a/test/sorted_string_map/Makefile.am b/test/sorted_string_map/Makefile.am
new file mode 100644
index 0000000..0d6f9e0
--- /dev/null
+++ b/test/sorted_string_map/Makefile.am
@@ -0,0 +1,14 @@
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include
+
+check_PROGRAMS = test
+
+test_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+TESTS = test
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/sorted_string_map/Makefile.in b/test/sorted_string_map/Makefile.in
new file mode 100644
index 0000000..4e02b27
--- /dev/null
+++ b/test/sorted_string_map/Makefile.in
@@ -0,0 +1,989 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
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+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
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+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
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+    esac; \
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+  test $$has_opt = yes
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+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
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+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
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+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f $(top_builddir)/test/$(DEPDIR)/test_global.Po
+	-rm -f ./$(DEPDIR)/test_main.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
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+
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+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am check-valgrind-am check-valgrind-drd-am \
+	check-valgrind-drd-local check-valgrind-helgrind-am \
+	check-valgrind-helgrind-local check-valgrind-local \
+	check-valgrind-memcheck-am check-valgrind-memcheck-local \
+	check-valgrind-sgcheck-am check-valgrind-sgcheck-local clean \
+	clean-checkPROGRAMS clean-generic cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic distclean-tags \
+	distdir dvi dvi-am html html-am info info-am install \
+	install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+@VALGRIND_CHECK_RULES@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/sorted_string_map/test_main.cpp b/test/sorted_string_map/test_main.cpp
new file mode 100644
index 0000000..4f94aab
--- /dev/null
+++ b/test/sorted_string_map/test_main.cpp
@@ -0,0 +1,197 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2014-2015 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp"
+#define MDDS_SORTED_STRING_MAP_DEBUG 1
+#include "mdds/sorted_string_map.hpp"
+#include "mdds/global.hpp"
+
+#include <cstring>
+#include <vector>
+#include <fstream>
+
+enum name_type
+{
+    name_none = 0,
+    name_andy,
+    name_bruce,
+    name_charlie,
+    name_david
+};
+
+void ssmap_test_basic()
+{
+    stack_printer __sp__(__func__);
+
+    typedef mdds::sorted_string_map<name_type> map_type;
+
+    map_type::entry entries[] = {
+        {MDDS_ASCII("andy"), name_andy},   {MDDS_ASCII("andy1"), name_andy},      {MDDS_ASCII("andy13"), name_andy},
+        {MDDS_ASCII("bruce"), name_bruce}, {MDDS_ASCII("charlie"), name_charlie}, {MDDS_ASCII("david"), name_david},
+    };
+
+    size_t entry_count = sizeof(entries) / sizeof(entries[0]);
+    map_type names(entries, entry_count, name_none);
+    for (size_t i = 0; i < entry_count; ++i)
+    {
+        cout << "* key = " << entries[i].key << endl;
+        bool res = names.find(entries[i].key, strlen(entries[i].key)) == entries[i].value;
+        assert(res);
+    }
+
+    // Try invalid keys.
+    assert(names.find("foo", 3) == name_none);
+    assert(names.find("andy133", 7) == name_none);
+}
+
+void ssmap_test_mixed_case_null()
+{
+    stack_printer __sp__(__func__);
+
+    typedef mdds::sorted_string_map<int> map_type;
+
+    map_type::entry entries[] = {
+        {MDDS_ASCII("NULL"), 1},
+        {MDDS_ASCII("Null"), 2},
+        {MDDS_ASCII("null"), 3},
+        {MDDS_ASCII("~"), 4},
+    };
+
+    size_t entry_count = sizeof(entries) / sizeof(entries[0]);
+    map_type names(entries, entry_count, -1);
+    for (size_t i = 0; i < entry_count; ++i)
+    {
+        cout << "* key = " << entries[i].key << endl;
+        bool res = names.find(entries[i].key, strlen(entries[i].key)) == entries[i].value;
+        assert(res);
+    }
+
+    // Try invalid keys.
+    assert(names.find(MDDS_ASCII("NUll")) == -1);
+    assert(names.find(MDDS_ASCII("Oull")) == -1);
+    assert(names.find(MDDS_ASCII("Mull")) == -1);
+    assert(names.find(MDDS_ASCII("hell")) == -1);
+}
+
+void ssmap_test_string_view_entry()
+{
+    stack_printer __sp__(__func__);
+
+    constexpr int cv_unknown = -1;
+    constexpr int cv_days = 0;
+    constexpr int cv_hours = 1;
+    constexpr int cv_minutes = 2;
+    constexpr int cv_months = 3;
+    constexpr int cv_quarters = 4;
+    constexpr int cv_range = 5;
+    constexpr int cv_seconds = 6;
+    constexpr int cv_years = 7;
+
+    using map_type = mdds::sorted_string_map<int, mdds::string_view_map_entry>;
+
+    constexpr map_type::entry entries[] = {
+        {"days", cv_days},         {"hours", cv_hours}, {"minutes", cv_minutes}, {"months", cv_months},
+        {"quarters", cv_quarters}, {"range", cv_range}, {"seconds", cv_seconds}, {"years", cv_years},
+    };
+
+    map_type mapping{entries, std::size(entries), cv_unknown};
+
+    for (const auto& entry : entries)
+    {
+        auto v = mapping.find(entry.key);
+        assert(v == entry.value);
+    }
+
+    constexpr std::string_view unknown_keys[] = {
+        "dayss", "Days", "ddays", "adfsd", "secoonds", "years ",
+    };
+
+    for (const auto& key : unknown_keys)
+    {
+        auto v = mapping.find(key);
+        assert(v == cv_unknown);
+    }
+}
+
+void ssmap_test_perf()
+{
+    stack_printer __sp__(__func__);
+
+    std::ifstream in("misc/sorted_string_data.dat");
+    typedef mdds::sorted_string_map<int> map_type;
+    std::vector<map_type::entry> data;
+    std::string line;
+    int i = 0;
+    while (std::getline(in, line))
+    {
+        data.push_back(map_type::entry());
+        data.back().key_length = line.size();
+        data.back().value = i;
+        char* str = new char[line.size()];
+        data.back().key = str;
+        strcpy(str, &line[0]);
+        ++i;
+    }
+
+    assert(data.size() > 1000);
+    {
+        stack_printer __stack_printer__("::ssmap_test_perf");
+        map_type names(data.data(), data.size(), -1);
+
+        assert(names.find(MDDS_ASCII("test")) == -1);
+    }
+
+    for (auto it = data.begin(), itEnd = data.end(); it != itEnd; ++it)
+    {
+        delete[] it->key;
+    }
+}
+
+int main(int argc, char** argv)
+{
+    cmd_options opt;
+    if (!parse_cmd_options(argc, argv, opt))
+        return EXIT_FAILURE;
+
+    if (opt.test_func)
+    {
+        ssmap_test_basic();
+        ssmap_test_mixed_case_null();
+        ssmap_test_string_view_entry();
+    }
+
+    if (opt.test_perf)
+    {
+        ssmap_test_perf();
+    }
+
+    fprintf(stdout, "Test finished successfully!\n");
+    return 0;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/test_global.cpp b/test/test_global.cpp
new file mode 100644
index 0000000..90f86c6
--- /dev/null
+++ b/test/test_global.cpp
@@ -0,0 +1,108 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2021 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include "test_global.hpp" // This must be the first header to be included.
+
+#include <cstring>
+#include <chrono>
+
+cmd_options::cmd_options() : test_func(false), test_perf(false)
+{}
+
+bool parse_cmd_options(int argc, char** argv, cmd_options& opt)
+{
+    using namespace std;
+
+    if (argc > 1)
+    {
+        for (int i = 1; i < argc; ++i)
+        {
+            if (!strncmp(argv[i], "func", 4))
+                opt.test_func = true;
+            else if (!strncmp(argv[i], "perf", 4))
+                opt.test_perf = true;
+            else
+            {
+                cout << "unknown argument: " << argv[i] << endl;
+                return false;
+            }
+        }
+    }
+    else
+        opt.test_func = true;
+
+    return true;
+}
+
+double get_current_time()
+{
+    uint64_t usec_since_epoch =
+        std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch())
+            .count();
+
+    return usec_since_epoch / 1000000.0;
+}
+
+stack_watch::stack_watch() : m_start_time(get_current_time())
+{}
+
+void stack_watch::reset()
+{
+    m_start_time = get_current_time();
+}
+
+double stack_watch::get_duration() const
+{
+    return get_current_time() - m_start_time;
+}
+
+stack_printer::stack_printer(const char* msg) : m_msg(msg)
+{
+    std::cout << m_msg << ": --begin" << std::endl;
+    m_start_time = get_current_time();
+}
+
+stack_printer::stack_printer(std::string msg) : m_msg(std::move(msg))
+{
+    std::cout << m_msg << ": --begin" << std::endl;
+    m_start_time = get_current_time();
+}
+
+stack_printer::~stack_printer()
+{
+    double end_time = get_current_time();
+    std::cout << m_msg << ": --end (duration: " << (end_time - m_start_time) << " sec)" << std::endl;
+}
+
+void stack_printer::print_time(int line) const
+{
+    double end_time = get_current_time();
+    std::cout << m_msg << ": --(" << line << ") (duration: " << (end_time - m_start_time) << " sec)" << std::endl;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/test/trie_map/Makefile.am b/test/trie_map/Makefile.am
new file mode 100644
index 0000000..b4927a7
--- /dev/null
+++ b/test/trie_map/Makefile.am
@@ -0,0 +1,14 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+check_PROGRAMS = test-main
+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+TESTS = test-main
+
+@VALGRIND_CHECK_RULES@
diff --git a/test/trie_map/Makefile.in b/test/trie_map/Makefile.in
new file mode 100644
index 0000000..6630a00
--- /dev/null
+++ b/test/trie_map/Makefile.in
@@ -0,0 +1,990 @@
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+
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
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+  sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g'
+am__uninstall_files_from_dir = { \
+  test -z "$$files" \
+    || { test ! -d "$$dir" && test ! -f "$$dir" && test ! -r "$$dir"; } \
+    || { echo " ( cd '$$dir' && rm -f" $$files ")"; \
+         $(am__cd) "$$dir" && rm -f $$files; }; \
+  }
+am__recheck_rx = ^[ 	]*:recheck:[ 	]*
+am__global_test_result_rx = ^[ 	]*:global-test-result:[ 	]*
+am__copy_in_global_log_rx = ^[ 	]*:copy-in-global-log:[ 	]*
+# A command that, given a newline-separated list of test names on the
+# standard input, print the name of the tests that are to be re-run
+# upon "make recheck".
+am__list_recheck_tests = $(AWK) '{ \
+  recheck = 1; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
+    { \
+      if (rc < 0) \
+        { \
+          if ((getline line2 < ($$0 ".log")) < 0) \
+	    recheck = 0; \
+          break; \
+        } \
+      else if (line ~ /$(am__recheck_rx)[nN][Oo]/) \
+        { \
+          recheck = 0; \
+          break; \
+        } \
+      else if (line ~ /$(am__recheck_rx)[yY][eE][sS]/) \
+        { \
+          break; \
+        } \
+    }; \
+  if (recheck) \
+    print $$0; \
+  close ($$0 ".trs"); \
+  close ($$0 ".log"); \
+}'
+# A command that, given a newline-separated list of test names on the
+# standard input, create the global log from their .trs and .log files.
+am__create_global_log = $(AWK) ' \
+function fatal(msg) \
+{ \
+  print "fatal: making $@: " msg | "cat >&2"; \
+  exit 1; \
+} \
+function rst_section(header) \
+{ \
+  print header; \
+  len = length(header); \
+  for (i = 1; i <= len; i = i + 1) \
+    printf "="; \
+  printf "\n\n"; \
+} \
+{ \
+  copy_in_global_log = 1; \
+  global_test_result = "RUN"; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
+    { \
+      if (rc < 0) \
+         fatal("failed to read from " $$0 ".trs"); \
+      if (line ~ /$(am__global_test_result_rx)/) \
+        { \
+          sub("$(am__global_test_result_rx)", "", line); \
+          sub("[ 	]*$$", "", line); \
+          global_test_result = line; \
+        } \
+      else if (line ~ /$(am__copy_in_global_log_rx)[nN][oO]/) \
+        copy_in_global_log = 0; \
+    }; \
+  if (copy_in_global_log) \
+    { \
+      rst_section(global_test_result ": " $$0); \
+      while ((rc = (getline line < ($$0 ".log"))) != 0) \
+      { \
+        if (rc < 0) \
+          fatal("failed to read from " $$0 ".log"); \
+        print line; \
+      }; \
+      printf "\n"; \
+    }; \
+  close ($$0 ".trs"); \
+  close ($$0 ".log"); \
+}'
+# Restructured Text title.
+am__rst_title = { sed 's/.*/   &   /;h;s/./=/g;p;x;s/ *$$//;p;g' && echo; }
+# Solaris 10 'make', and several other traditional 'make' implementations,
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+# Default flags passed to test drivers.
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+  --enable-hard-errors "$$am__enable_hard_errors" \
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+# developer- defined test setup AM_TESTS_ENVIRONMENT (if any), and
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+# thy have one).
+am__check_pre = \
+$(am__sh_e_setup);					\
+$(am__vpath_adj_setup) $(am__vpath_adj)			\
+$(am__tty_colors);					\
+srcdir=$(srcdir); export srcdir;			\
+case "$@" in						\
+  */*) am__odir=`echo "./$@" | sed 's|/[^/]*$$||'`;;	\
+    *) am__odir=.;; 					\
+esac;							\
+test "x$$am__odir" = x"." || test -d "$$am__odir" 	\
+  || $(MKDIR_P) "$$am__odir" || exit $$?;		\
+if test -f "./$$f"; then dir=./;			\
+elif test -f "$$f"; then dir=;				\
+else dir="$(srcdir)/"; fi;				\
+tst=$$dir$$f; log='$@'; 				\
+if test -n '$(DISABLE_HARD_ERRORS)'; then		\
+  am__enable_hard_errors=no; 				\
+else							\
+  am__enable_hard_errors=yes; 				\
+fi; 							\
+case " $(XFAIL_TESTS) " in				\
+  *[\ \	]$$f[\ \	]* | *[\ \	]$$dir$$f[\ \	]*) \
+    am__expect_failure=yes;;				\
+  *)							\
+    am__expect_failure=no;;				\
+esac; 							\
+$(AM_TESTS_ENVIRONMENT) $(TESTS_ENVIRONMENT)
+# A shell command to get the names of the tests scripts with any registered
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+# '$bases'.  This honors runtime overriding of TESTS and TEST_LOGS.  Sadly,
+# we cannot use something simpler, involving e.g., "$(TEST_LOGS:.log=)",
+# since that might cause problem with VPATH rewrites for suffix-less tests.
+# See also 'test-harness-vpath-rewrite.sh' and 'test-trs-basic.sh'.
+am__set_TESTS_bases = \
+  bases='$(TEST_LOGS)'; \
+  bases=`for i in $$bases; do echo $$i; done | sed 's/\.log$$//'`; \
+  bases=`echo $$bases`
+AM_TESTSUITE_SUMMARY_HEADER = ' for $(PACKAGE_STRING)'
+RECHECK_LOGS = $(TEST_LOGS)
+AM_RECURSIVE_TARGETS = check recheck
+TEST_SUITE_LOG = test-suite.log
+TEST_EXTENSIONS = @EXEEXT@ .test
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+LOG_COMPILE = $(LOG_COMPILER) $(AM_LOG_FLAGS) $(LOG_FLAGS)
+am__set_b = \
+  case '$@' in \
+    */*) \
+      case '$*' in \
+        */*) b='$*';; \
+          *) b=`echo '$@' | sed 's/\.log$$//'`; \
+       esac;; \
+    *) \
+      b='$*';; \
+  esac
+am__test_logs1 = $(TESTS:=.log)
+am__test_logs2 = $(am__test_logs1:@EXEEXT@.log=.log)
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+am__DIST_COMMON = $(srcdir)/Makefile.in $(top_srcdir)/depcomp \
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+program_transform_name = @program_transform_name@
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+top_srcdir = @top_srcdir@
+valgrind_enabled_tools = @valgrind_enabled_tools@
+valgrind_tools = @valgrind_tools@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/test/include \
+	$(CXXFLAGS_UNITTESTS)
+
+test_main_SOURCES = \
+	test_main.cpp \
+	$(top_srcdir)/test/test_global.cpp
+
+all: all-am
+
+.SUFFIXES:
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+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign test/trie_map/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign test/trie_map/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
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+clean-checkPROGRAMS:
+	-test -z "$(check_PROGRAMS)" || rm -f $(check_PROGRAMS)
+$(top_builddir)/test/$(am__dirstamp):
+	@$(MKDIR_P) $(top_builddir)/test
+	@: > $(top_builddir)/test/$(am__dirstamp)
+$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) $(top_builddir)/test/$(DEPDIR)
+	@: > $(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+$(top_builddir)/test/test_global.$(OBJEXT):  \
+	$(top_builddir)/test/$(am__dirstamp) \
+	$(top_builddir)/test/$(DEPDIR)/$(am__dirstamp)
+
+test-main$(EXEEXT): $(test_main_OBJECTS) $(test_main_DEPENDENCIES) $(EXTRA_test_main_DEPENDENCIES) 
+	@rm -f test-main$(EXEEXT)
+	$(AM_V_CXXLD)$(CXXLINK) $(test_main_OBJECTS) $(test_main_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+	-rm -f $(top_builddir)/test/*.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@$(top_builddir)/test/$(DEPDIR)/test_global.Po@am__quote@ # am--include-marker
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+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.cpp.o:
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
+@am__fastdepCXX_TRUE@	$(CXXCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
+@am__fastdepCXX_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Po
+@AMDEP_TRUE@@am__fastdepCXX_FALSE@	$(AM_V_CXX)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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+
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+@am__fastdepCXX_TRUE@	$(CXXCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ `$(CYGPATH_W) '$<'` &&\
+@am__fastdepCXX_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Po
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+check-valgrind-drd-local: 
+check-valgrind-sgcheck-local: 
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
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+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+# Recover from deleted '.trs' file; this should ensure that
+# "rm -f foo.log; make foo.trs" re-run 'foo.test', and re-create
+# both 'foo.log' and 'foo.trs'.  Break the recipe in two subshells
+# to avoid problems with "make -n".
+.log.trs:
+	rm -f $< $@
+	$(MAKE) $(AM_MAKEFLAGS) $<
+
+# Leading 'am--fnord' is there to ensure the list of targets does not
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+am--force-recheck:
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+
+$(TEST_SUITE_LOG): $(TEST_LOGS)
+	@$(am__set_TESTS_bases); \
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+	redo_bases=`for i in $$bases; do \
+	              am__f_ok $$i.trs && am__f_ok $$i.log || echo $$i; \
+	            done`; \
+	if test -n "$$redo_bases"; then \
+	  redo_logs=`for i in $$redo_bases; do echo $$i.log; done`; \
+	  redo_results=`for i in $$redo_bases; do echo $$i.trs; done`; \
+	  if $(am__make_dryrun); then :; else \
+	    rm -f $$redo_logs && rm -f $$redo_results || exit 1; \
+	  fi; \
+	fi; \
+	if test -n "$$am__remaking_logs"; then \
+	  echo "fatal: making $(TEST_SUITE_LOG): possible infinite" \
+	       "recursion detected" >&2; \
+	elif test -n "$$redo_logs"; then \
+	  am__remaking_logs=yes $(MAKE) $(AM_MAKEFLAGS) $$redo_logs; \
+	fi; \
+	if $(am__make_dryrun); then :; else \
+	  st=0;  \
+	  errmsg="fatal: making $(TEST_SUITE_LOG): failed to create"; \
+	  for i in $$redo_bases; do \
+	    test -f $$i.trs && test -r $$i.trs \
+	      || { echo "$$errmsg $$i.trs" >&2; st=1; }; \
+	    test -f $$i.log && test -r $$i.log \
+	      || { echo "$$errmsg $$i.log" >&2; st=1; }; \
+	  done; \
+	  test $$st -eq 0 || exit 1; \
+	fi
+	@$(am__sh_e_setup); $(am__tty_colors); $(am__set_TESTS_bases); \
+	ws='[ 	]'; \
+	results=`for b in $$bases; do echo $$b.trs; done`; \
+	test -n "$$results" || results=/dev/null; \
+	all=`  grep "^$$ws*:test-result:"           $$results | wc -l`; \
+	pass=` grep "^$$ws*:test-result:$$ws*PASS"  $$results | wc -l`; \
+	fail=` grep "^$$ws*:test-result:$$ws*FAIL"  $$results | wc -l`; \
+	skip=` grep "^$$ws*:test-result:$$ws*SKIP"  $$results | wc -l`; \
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+	xpass=`grep "^$$ws*:test-result:$$ws*XPASS" $$results | wc -l`; \
+	error=`grep "^$$ws*:test-result:$$ws*ERROR" $$results | wc -l`; \
+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
+	else \
+	  success=false; \
+	fi; \
+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
+	create_testsuite_report --maybe-color;				\
+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
+check-TESTS: $(check_PROGRAMS)
+	@list='$(RECHECK_LOGS)';           test -z "$$list" || rm -f $$list
+	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
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+	log_list=`echo $$log_list`; trs_list=`echo $$trs_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) TEST_LOGS="$$log_list"; \
+	exit $$?;
+recheck: all $(check_PROGRAMS)
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	bases=`for i in $$bases; do echo $$i; done \
+	         | $(am__list_recheck_tests)` || exit 1; \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
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+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
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+	@p='test-main$(EXEEXT)'; \
+	b='test-main'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
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+	$(am__set_b); \
+	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
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+	"$$tst" $(AM_TESTS_FD_REDIRECT)
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+@am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_PROGRAMS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
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+clean-generic:
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+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	-test -z "$(top_builddir)/test/$(am__dirstamp)" || rm -f $(top_builddir)/test/$(am__dirstamp)
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+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+@VALGRIND_CHECK_RULES@
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/test/trie_map/test_main.cpp b/test/trie_map/test_main.cpp
new file mode 100644
index 0000000..3b7aa19
--- /dev/null
+++ b/test/trie_map/test_main.cpp
@@ -0,0 +1,1909 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2015-2018 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#define MDDS_TRIE_MAP_DEBUG 1
+#include "test_global.hpp" // This must be the first header to be included.
+//#define MDDS_TRIE_MAP_DEBUG_DUMP_TRIE 1
+//#define MDDS_TRIE_MAP_DEBUG_DUMP_PACKED 1
+
+#include "mdds/trie_map.hpp"
+#include "mdds/global.hpp"
+
+#include <iterator>
+#include <fstream>
+#include <vector>
+#include <list>
+
+using namespace std;
+using namespace mdds;
+
+using packed_int_map_type = packed_trie_map<trie::std_string_traits, int>;
+using packed_str_map_type = packed_trie_map<trie::std_string_traits, std::string>;
+
+bool verify_entries(const packed_int_map_type& db, const packed_int_map_type::entry* entries, size_t entry_size)
+{
+    auto results = db.prefix_search(nullptr, 0);
+    for (auto it = results.begin(), ite = results.end(); it != ite; ++it)
+        cout << it->first << ": " << it->second << endl;
+
+    const packed_int_map_type::entry* p = entries;
+    const packed_int_map_type::entry* p_end = p + entry_size;
+    for (; p != p_end; ++p)
+    {
+        auto it = db.find(p->key, p->keylen);
+        if (it == db.end() || it->second != p->value)
+            return false;
+    }
+
+    return true;
+}
+
+template<typename T>
+bool check_equal(const T& left, const T& right)
+{
+    if (left.first != right.first)
+    {
+        cout << "left: " << left.first << "; right: " << right.first << endl;
+        return false;
+    }
+
+    if (left.second != right.second)
+    {
+        cout << "left: " << left.second << "; right: " << right.second << endl;
+        return false;
+    }
+
+    return true;
+}
+
+void trie_packed_test1()
+{
+    stack_printer __stack_printer__("::trie_packed_test1");
+
+    packed_int_map_type::entry entries[] = {
+        {MDDS_ASCII("a"), 13},
+        {MDDS_ASCII("aa"), 10},
+        {MDDS_ASCII("ab"), 3},
+        {MDDS_ASCII("b"), 7},
+    };
+
+    size_t entry_size = std::size(entries);
+    packed_int_map_type db(entries, entry_size);
+    assert(db.size() == 4);
+    assert(verify_entries(db, entries, entry_size));
+
+    // invalid keys
+    assert(db.find(MDDS_ASCII("ac")) == db.end());
+    assert(db.find(MDDS_ASCII("c")) == db.end());
+
+    {
+        // Get all key-value pairs.
+        auto results = db.prefix_search(nullptr, 0);
+        size_t n = std::distance(results.begin(), results.end());
+        assert(n == 4);
+        auto it = results.begin();
+        assert(it->first == "a");
+        assert(it->second == 13);
+        ++it;
+        assert(it->first == "aa");
+        assert(it->second == 10);
+        ++it;
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 7);
+        ++it;
+        assert(it == results.end());
+    }
+
+    {
+        auto it = db.find(MDDS_ASCII("a"));
+        assert(it->first == "a");
+        assert(it->second == 13);
+        ++it;
+        assert(it->first == "aa");
+        assert(it->second == 10);
+        ++it;
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 7);
+        ++it;
+        assert(it == db.end());
+    }
+}
+
+void trie_packed_test2()
+{
+    stack_printer __stack_printer__("::trie_packed_test2");
+
+    packed_int_map_type::entry entries[] = {
+        {MDDS_ASCII("aaron"), 0}, {MDDS_ASCII("al"), 1},    {MDDS_ASCII("aldi"), 2},    {MDDS_ASCII("andy"), 3},
+        {MDDS_ASCII("bison"), 4}, {MDDS_ASCII("bruce"), 5}, {MDDS_ASCII("charlie"), 6}, {MDDS_ASCII("charlotte"), 7},
+        {MDDS_ASCII("david"), 8}, {MDDS_ASCII("dove"), 9},  {MDDS_ASCII("e"), 10},      {MDDS_ASCII("eva"), 11},
+    };
+
+    size_t entry_size = std::size(entries);
+    packed_int_map_type db(entries, entry_size);
+    assert(db.size() == 12);
+    assert(verify_entries(db, entries, entry_size));
+
+    // invalid keys
+    assert(db.find(MDDS_ASCII("aarons")) == db.end());
+    assert(db.find(MDDS_ASCII("a")) == db.end());
+    assert(db.find(MDDS_ASCII("biso")) == db.end());
+    assert(db.find(MDDS_ASCII("dAvid")) == db.end());
+}
+
+void trie_packed_test3()
+{
+    stack_printer __stack_printer__("::trie_packed_test3");
+
+    packed_int_map_type::entry entries[] = {
+        {MDDS_ASCII("NULL"), 1},
+        {MDDS_ASCII("Null"), 2},
+        {MDDS_ASCII("null"), 3},
+        {MDDS_ASCII("~"), 4},
+    };
+
+    size_t entry_size = std::size(entries);
+    packed_int_map_type db(entries, entry_size);
+    assert(db.size() == 4);
+    assert(verify_entries(db, entries, entry_size));
+
+    // invalid keys
+    assert(db.find(MDDS_ASCII("NUll")) == db.end());
+    assert(db.find(MDDS_ASCII("Oull")) == db.end());
+    assert(db.find(MDDS_ASCII("Mull")) == db.end());
+    assert(db.find(MDDS_ASCII("hell")) == db.end());
+}
+
+void trie_packed_test4()
+{
+    stack_printer __stack_printer__("::trie_packed_test4");
+
+    enum name_type
+    {
+        name_none = 0,
+        name_andy,
+        name_bruce,
+        name_charlie,
+        name_david
+    };
+
+    packed_int_map_type::entry entries[] = {
+        {MDDS_ASCII("andy"), name_andy},   {MDDS_ASCII("andy1"), name_andy},      {MDDS_ASCII("andy13"), name_andy},
+        {MDDS_ASCII("bruce"), name_bruce}, {MDDS_ASCII("charlie"), name_charlie}, {MDDS_ASCII("david"), name_david},
+    };
+
+    size_t entry_size = std::size(entries);
+    packed_int_map_type db(entries, entry_size);
+    assert(db.size() == 6);
+    assert(verify_entries(db, entries, entry_size));
+
+    // Try invalid keys.
+    assert(db.find("foo", 3) == db.end());
+    assert(db.find("andy133", 7) == db.end());
+
+    // Test prefix search on 'andy'.
+    auto results = db.prefix_search(MDDS_ASCII("andy"));
+    size_t n = std::distance(results.begin(), results.end());
+    assert(n == 3);
+    auto it = results.begin();
+    assert(it->first == "andy");
+    ++it;
+    assert(it->first == "andy1");
+    ++it;
+    assert(it->first == "andy13");
+    ++it;
+    assert(it == results.end());
+
+    results = db.prefix_search(MDDS_ASCII("andy's toy"));
+    n = std::distance(results.begin(), results.end());
+    assert(n == 0);
+
+    results = db.prefix_search(MDDS_ASCII("e"));
+    n = std::distance(results.begin(), results.end());
+    assert(n == 0);
+
+    results = db.prefix_search(MDDS_ASCII("b"));
+    n = std::distance(results.begin(), results.end());
+    assert(n == 1);
+    it = results.begin();
+    assert(it->first == "bruce");
+    assert(it->second == name_bruce);
+    ++it;
+    assert(it == results.end());
+}
+
+struct value_wrapper
+{
+    int value;
+
+    value_wrapper() : value(0)
+    {}
+    value_wrapper(int _value) : value(_value)
+    {}
+};
+
+std::ostream& operator<<(std::ostream& os, const value_wrapper& vw)
+{
+    os << vw.value;
+    return os;
+}
+
+typedef packed_trie_map<trie::std_string_traits, value_wrapper> packed_value_map_type;
+
+void trie_packed_test_value_life_cycle()
+{
+    stack_printer __stack_printer__("::trie_packed_test_value_life_cycle");
+
+    using entry = packed_value_map_type::entry;
+
+    // Entries must be sorted by the key!
+    std::unique_ptr<vector<entry>> entries(new vector<entry>);
+    entries->push_back(entry(MDDS_ASCII("fifteen"), value_wrapper(15)));
+    entries->push_back(entry(MDDS_ASCII("ten"), value_wrapper(10)));
+    entries->push_back(entry(MDDS_ASCII("twelve"), value_wrapper(12)));
+    entries->push_back(entry(MDDS_ASCII("two"), value_wrapper(2)));
+
+    packed_value_map_type db(entries->data(), entries->size());
+
+    // Delete the original entry store.
+    entries.reset();
+
+    auto results = db.prefix_search(nullptr, 0);
+    std::for_each(results.begin(), results.end(), [](const packed_value_map_type::const_iterator::value_type& v) {
+        cout << v.first << ": " << v.second.value << endl;
+    });
+
+    auto it = db.find(MDDS_ASCII("twelve"));
+    assert(it->second.value == 12);
+
+    it = db.find(MDDS_ASCII("two"));
+    assert(it->second.value == 2);
+
+    it = db.find(MDDS_ASCII("foo"));
+    assert(it == db.end());
+}
+
+struct custom_string
+{
+    std::string data;
+
+    custom_string()
+    {}
+    custom_string(const std::string& _data) : data(_data)
+    {}
+};
+
+struct custom_string_trait
+{
+    typedef uint16_t key_unit_type;
+    typedef custom_string key_type;
+    typedef std::vector<key_unit_type> key_buffer_type;
+
+    static key_buffer_type to_key_buffer(const key_unit_type* str, size_t length)
+    {
+        key_buffer_type buf;
+        const key_unit_type* str_end = str + length;
+        for (; str != str_end; ++str)
+            buf.push_back(*str);
+
+        return buf;
+    }
+
+    static void push_back(key_buffer_type& buffer, key_unit_type c)
+    {
+        buffer.push_back(c);
+    }
+
+    static void pop_back(key_buffer_type& buffer)
+    {
+        buffer.pop_back();
+    }
+
+    static key_type to_key(const key_buffer_type& buf)
+    {
+        // Cast all uint16_t chars to regular chars.
+        key_type s;
+
+        std::for_each(buf.begin(), buf.end(), [&](key_unit_type c) { s.data.push_back(static_cast<char>(c)); });
+        return s;
+    }
+};
+
+typedef packed_trie_map<custom_string_trait, std::string> packed_custom_str_map_type;
+
+void trie_packed_test_custom_string()
+{
+    stack_printer __stack_printer__("::trie_packed_test_custom_string");
+
+    const uint16_t key_alex[] = {0x41, 0x6C, 0x65, 0x78};
+    const uint16_t key_bob[] = {0x42, 0x6F, 0x62};
+    const uint16_t key_max[] = {0x4D, 0x61, 0x78};
+    const uint16_t key_ming[] = {0x4D, 0x69, 0x6E, 0x67};
+
+    const packed_custom_str_map_type::entry entries[] = {
+        {key_alex, 4, "Alex"},
+        {key_bob, 3, "Bob"},
+        {key_max, 3, "Max"},
+        {key_ming, 4, "Ming"},
+    };
+
+    size_t n_entries = std::size(entries);
+    packed_custom_str_map_type db(entries, n_entries);
+    for (size_t i = 0; i < n_entries; ++i)
+    {
+        auto it = db.find(entries[i].key, entries[i].keylen);
+        cout << it->second << endl;
+        assert(it->second == entries[i].value);
+    }
+
+    // Find all keys that start with 'M'.
+    auto results = db.prefix_search(key_max, 1);
+    size_t n = std::distance(results.begin(), results.end());
+    assert(n == 2);
+    auto it = results.begin();
+    assert(it->first.data == it->second);
+    assert(it->second == "Max");
+    ++it;
+    assert(it->first.data == it->second);
+    assert(it->second == "Ming");
+    ++it;
+    assert(it == results.end());
+}
+
+void trie_packed_test_iterator_empty()
+{
+    stack_printer __stack_printer__("::trie_packed_test_iterator_empty");
+    packed_int_map_type db(nullptr, 0);
+
+    // empty container
+    packed_int_map_type::const_iterator it = db.begin();
+    packed_int_map_type::const_iterator ite = db.end();
+
+    assert(it == ite);
+}
+
+void trie_packed_test_iterator()
+{
+    stack_printer __stack_printer__("::trie_packed_test_iterator");
+
+    using trie_map_type = trie_map<trie::std_string_traits, int>;
+    using packed_type = trie_map_type::packed_type;
+    using kv = packed_type::key_value_type;
+
+    trie_map_type db;
+
+    db.insert(MDDS_ASCII("a"), 1);
+    packed_type packed = db.pack();
+    assert(db.size() == packed.size());
+    packed_type::const_iterator it = packed.begin();
+    packed_type::const_iterator ite = packed.end();
+    assert(it != ite);
+    assert(it->first == "a");
+    assert(it->second == 1);
+
+    db.insert(MDDS_ASCII("ab"), 2);
+    packed = db.pack(); // this invalidates the end position.
+    assert(db.size() == packed.size());
+
+    it = packed.begin();
+    ite = packed.end();
+    assert(it != ite);
+    assert(it->first == "a");
+    assert(it->second == 1);
+
+    ++it;
+    bool check_true = check_equal(*it++, kv("ab", 2));
+    assert(check_true);
+    assert(it == ite);
+
+    db.insert(MDDS_ASCII("aba"), 3);
+    db.insert(MDDS_ASCII("abb"), 4);
+    db.insert(MDDS_ASCII("abc"), 5);
+    db.insert(MDDS_ASCII("bc"), 6);
+    db.insert(MDDS_ASCII("bcd"), 7);
+
+    packed = db.pack();
+    assert(db.size() == packed.size());
+
+    it = packed.begin();
+    ite = packed.end();
+
+    assert(*it == kv("a", 1));
+    assert(check_equal(*(++it), kv("ab", 2)));
+    assert(check_equal(*(++it), kv("aba", 3)));
+    assert(check_equal(*(++it), kv("abb", 4)));
+    assert(check_equal(*(++it), kv("abc", 5)));
+    assert(check_equal(*(++it), kv("bc", 6)));
+    assert(check_equal(*(++it), kv("bcd", 7)));
+    assert(it->first == "bcd");
+    assert(it->second == 7);
+    ++it;
+    assert(it == ite);
+
+    --it;
+    assert(it != ite);
+    assert(check_equal(*it, kv("bcd", 7)));
+    --it;
+    assert(check_equal(*it, kv("bc", 6)));
+    --it;
+    assert(check_equal(*it, kv("abc", 5)));
+    --it;
+    assert(check_equal(*it, kv("abb", 4)));
+    --it;
+    assert(check_equal(*it, kv("aba", 3)));
+    --it;
+    assert(check_equal(*it, kv("ab", 2)));
+    assert(check_equal(*(--it), kv("a", 1)));
+    assert(it == packed.begin());
+
+    assert(check_equal(*(++it), kv("ab", 2)));
+    assert(check_equal(*(++it), kv("aba", 3)));
+    --it;
+    assert(check_equal(*it, kv("ab", 2)));
+    --it;
+    assert(check_equal(*it, kv("a", 1)));
+    ++it;
+    assert(check_equal(*it, kv("ab", 2)));
+    ++it;
+    assert(check_equal(*it, kv("aba", 3)));
+
+    // Post-decrement operator.
+    assert(check_equal(*it--, kv("aba", 3)));
+    assert(check_equal(*it, kv("ab", 2)));
+}
+
+void trie_packed_test_prefix_search1()
+{
+    stack_printer __stack_printer__("::trie_packed_test_prefix_search1");
+
+    using trie_map_type = trie_map<trie::std_string_traits, int>;
+    using packed_type = trie_map_type::packed_type;
+
+    trie_map_type db;
+    db.insert(MDDS_ASCII("andy"), 1);
+    db.insert(MDDS_ASCII("andy1"), 2);
+    db.insert(MDDS_ASCII("andy12"), 3);
+
+    {
+        auto results = db.prefix_search(MDDS_ASCII("andy"));
+        auto it = results.begin();
+        assert(it != results.end());
+        assert(it->first == "andy");
+        ++it;
+        assert(it->first == "andy1");
+        ++it;
+        assert(it->first == "andy12");
+        ++it;
+        assert(it == results.end());
+
+        size_t n = std::distance(results.begin(), results.end());
+        assert(n == 3);
+    }
+
+    packed_type packed = db.pack();
+    {
+        auto results = packed.prefix_search(MDDS_ASCII("andy"));
+        auto it = results.begin();
+        assert(it != results.end());
+        assert(it->first == "andy");
+        ++it;
+        assert(it->first == "andy1");
+        ++it;
+        assert(it->first == "andy12");
+        ++it;
+        assert(it == results.end());
+
+        size_t n = std::distance(results.begin(), results.end());
+        assert(n == 3);
+    }
+}
+
+void trie_packed_test_key_as_input()
+{
+    stack_printer __stack_printer__("::trie_packed_test_key_as_input");
+
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+
+    db.insert(std::string("string as key"), 1);
+    db.insert("literal as key", 2);
+    auto packed = db.pack();
+
+    auto it = packed.find("literal as key");
+    assert(it != packed.end());
+    assert(it->first == "literal as key");
+    assert(it->second == 2);
+
+    auto results = packed.prefix_search("str");
+    auto rit = results.begin();
+    assert(rit != results.end());
+    assert(rit->first == "string as key");
+    assert(rit->second == 1);
+    ++rit;
+    assert(rit == results.end());
+}
+
+void trie_packed_test_copying()
+{
+    stack_printer __stack_printer__("::trie_packed_test_copying");
+    using map_type = packed_trie_map<trie::std_string_traits, int>;
+
+    map_type::entry entries[] = {
+        {MDDS_ASCII("aaron"), 0}, {MDDS_ASCII("al"), 1},    {MDDS_ASCII("aldi"), 2},    {MDDS_ASCII("andy"), 3},
+        {MDDS_ASCII("bison"), 4}, {MDDS_ASCII("bruce"), 5}, {MDDS_ASCII("charlie"), 6}, {MDDS_ASCII("charlotte"), 7},
+        {MDDS_ASCII("david"), 8}, {MDDS_ASCII("dove"), 9},  {MDDS_ASCII("e"), 10},      {MDDS_ASCII("eva"), 11},
+    };
+
+    auto verify_content = [&entries](const map_type& db) {
+        auto it = db.begin();
+        const map_type::entry* p_entries = entries;
+        const map_type::entry* p_entries_end = p_entries + db.size();
+        size_t n = std::distance(p_entries, p_entries_end);
+        assert(db.size() == n);
+        assert(!db.empty());
+
+        for (; p_entries != p_entries_end; ++p_entries, ++it)
+        {
+            std::string key_expected(p_entries->key, p_entries->keylen);
+            assert(key_expected == it->first);
+            assert(p_entries->value == it->second);
+        }
+    };
+
+    auto db = std::make_unique<map_type>(entries, std::size(entries));
+    auto db_copied(*db);
+    assert(*db == db_copied);
+    assert(db->size() == db_copied.size());
+    db.reset();
+
+    auto it = db_copied.find("charlie");
+    assert(it != db_copied.end());
+    assert(it->first == "charlie");
+    assert(it->second == 6);
+
+    verify_content(db_copied);
+
+    auto db_moved(std::move(db_copied));
+    assert(db_copied.empty());
+    assert(!db_moved.empty());
+    assert(db_moved.size() == std::size(entries));
+
+    it = db_copied.find("bison");
+    assert(it == db_copied.end());
+    it = db_moved.find("bison");
+    assert(it != db_moved.end());
+    assert(it->first == "bison");
+    assert(it->second == 4);
+
+    verify_content(db_moved);
+
+    map_type db_copy_assigned;
+    assert(db_copy_assigned.empty());
+    db_copy_assigned = db_moved;
+    assert(db_copy_assigned == db_moved);
+
+    verify_content(db_moved);
+    verify_content(db_copy_assigned);
+
+    map_type db_move_assigned;
+    assert(db_move_assigned.empty());
+    db_move_assigned = std::move(db_moved);
+    assert(db_move_assigned != db_moved);
+
+    verify_content(db_move_assigned);
+    assert(db_moved.empty());
+}
+
+void trie_packed_test_non_equal()
+{
+    stack_printer __stack_printer__("::trie_packed_test_non_equal");
+
+    using map_type = packed_trie_map<trie::std_string_traits, int>;
+
+    map_type::entry entries1[] = {
+        {MDDS_ASCII("aaron"), 0}, {MDDS_ASCII("al"), 1},    {MDDS_ASCII("aldi"), 2},    {MDDS_ASCII("andy"), 3},
+        {MDDS_ASCII("bison"), 4}, {MDDS_ASCII("bruce"), 5}, {MDDS_ASCII("charlie"), 6}, {MDDS_ASCII("charlotte"), 7},
+        {MDDS_ASCII("david"), 8}, {MDDS_ASCII("dove"), 9},  {MDDS_ASCII("e"), 10},      {MDDS_ASCII("eva"), 11},
+    };
+
+    map_type::entry entries2[] = {
+        {MDDS_ASCII("aaron"), 0},   {MDDS_ASCII("al"), 1},        {MDDS_ASCII("aldi"), 2},
+        {MDDS_ASCII("andy"), 3},    {MDDS_ASCII("bison"), 4},     {MDDS_ASCII("bruce"), 2}, // different value
+        {MDDS_ASCII("charlie"), 6}, {MDDS_ASCII("charlotte"), 7}, {MDDS_ASCII("david"), 8},
+        {MDDS_ASCII("dove"), 9},    {MDDS_ASCII("e"), 10},        {MDDS_ASCII("eva"), 11},
+    };
+
+    // fewer entries
+    map_type::entry entries3[] = {
+        {MDDS_ASCII("aaron"), 0}, {MDDS_ASCII("al"), 1},    {MDDS_ASCII("aldi"), 2},    {MDDS_ASCII("andy"), 3},
+        {MDDS_ASCII("bison"), 4}, {MDDS_ASCII("bruce"), 5}, {MDDS_ASCII("charlie"), 6}, {MDDS_ASCII("charlotte"), 7},
+        {MDDS_ASCII("david"), 8}, {MDDS_ASCII("dove"), 9},  {MDDS_ASCII("e"), 10},
+    };
+
+    map_type db1(entries1, std::size(entries1));
+    map_type db2(entries2, std::size(entries2));
+    map_type db3(entries3, std::size(entries3));
+    assert(db1 != db2);
+    assert(db1 != db3);
+    assert(db2 != db3);
+
+    map_type db4(entries1, std::size(entries1));
+    map_type db5(entries2, std::size(entries2));
+    map_type db6(entries3, std::size(entries3));
+
+    assert(db1 == db4);
+    assert(db2 == db5);
+    assert(db3 == db6);
+}
+
+namespace trie_packed_test_save_and_load_state {
+
+struct _custom_variable_value
+{
+    enum class v_type
+    {
+        unknown,
+        fp32,
+        int64
+    };
+
+    v_type type;
+
+    union
+    {
+        float fp32;
+        int64_t int64;
+    } value;
+
+    _custom_variable_value() : type(v_type::unknown)
+    {}
+
+    _custom_variable_value(float v) : type(v_type::fp32)
+    {
+        value.fp32 = v;
+    }
+
+    _custom_variable_value(int v) : type(v_type::int64)
+    {
+        value.int64 = v;
+    }
+
+    _custom_variable_value(const _custom_variable_value& other) : type(other.type)
+    {
+        switch (type)
+        {
+            case v_type::fp32:
+                value.fp32 = other.value.fp32;
+                break;
+            case v_type::int64:
+                value.int64 = other.value.int64;
+                break;
+            default:;
+        }
+    }
+
+    bool operator==(const _custom_variable_value& other) const
+    {
+        if (type != other.type)
+            return false;
+
+        switch (type)
+        {
+            case v_type::fp32:
+                return value.fp32 == other.value.fp32;
+            case v_type::int64:
+                return value.int64 == other.value.int64;
+            default:;
+        }
+
+        return true;
+    }
+
+    bool operator!=(const _custom_variable_value& other) const
+    {
+        return !operator==(other);
+    }
+};
+
+struct _custom_variable_serializer
+{
+    union bin_value
+    {
+        char buffer[8];
+        float fp32;
+        int64_t int64;
+    };
+
+    static constexpr bool variable_size = true;
+
+    static void write(std::ostream& os, const _custom_variable_value& v)
+    {
+        bin_value bv;
+
+        switch (v.type)
+        {
+            case _custom_variable_value::v_type::unknown:
+            {
+                char c = 0;
+                os.write(&c, 1);
+                break;
+            }
+            case _custom_variable_value::v_type::fp32:
+            {
+                char c = 1;
+                os.write(&c, 1);
+                bv.fp32 = v.value.fp32;
+                os.write(bv.buffer, 4);
+                break;
+            }
+            case _custom_variable_value::v_type::int64:
+            {
+                char c = 2;
+                os.write(&c, 1);
+                bv.int64 = v.value.int64;
+                os.write(bv.buffer, 8);
+                break;
+            }
+        }
+    }
+
+    static void read(std::istream& is, size_t n, _custom_variable_value& v)
+    {
+        assert(n > 0);
+        char c;
+        is.read(&c, 1);
+
+        switch (c)
+        {
+            case 0:
+                v.type = _custom_variable_value::v_type::unknown;
+                break;
+            case 1:
+                v.type = _custom_variable_value::v_type::fp32;
+                break;
+            case 2:
+                v.type = _custom_variable_value::v_type::int64;
+                break;
+            default:
+                assert(!"invalid value type");
+        }
+
+        n -= 1;
+        bin_value bv;
+
+        switch (v.type)
+        {
+            case _custom_variable_value::v_type::fp32:
+                assert(n == 4);
+                is.read(bv.buffer, 4);
+                v.value.fp32 = bv.fp32;
+                break;
+            case _custom_variable_value::v_type::int64:
+                assert(n == 8);
+                is.read(bv.buffer, 8);
+                v.value.int64 = bv.int64;
+                break;
+            case _custom_variable_value::v_type::unknown:
+                break;
+            default:
+                assert(!"invalid value type");
+        }
+    }
+};
+
+/**
+ * mock value struct containing one value string that only stores "zero",
+ * "one", "two" or "three".  We use a custom serializer to store the value
+ * using only 1 byte each.
+ */
+struct _custom_fixed_value
+{
+    std::string value_string; // only stores "zero", "one", "two" or "three".
+
+    _custom_fixed_value()
+    {}
+
+    _custom_fixed_value(const char* p) : value_string(p, std::strlen(p))
+    {}
+
+    bool operator==(const _custom_fixed_value& other) const
+    {
+        return value_string == other.value_string;
+    }
+
+    bool operator!=(const _custom_fixed_value& other) const
+    {
+        return !operator==(other);
+    }
+};
+
+struct _custom_fixed_serializer
+{
+    static constexpr bool variable_size = false;
+    static constexpr size_t value_size = 1;
+
+    static void write(std::ostream& os, const _custom_fixed_value& v)
+    {
+        char bv = -1;
+
+        if (v.value_string == "zero")
+            bv = 0;
+        else if (v.value_string == "one")
+            bv = 1;
+        else if (v.value_string == "two")
+            bv = 2;
+        else if (v.value_string == "three")
+            bv = 3;
+
+        os.write(&bv, 1);
+    }
+
+    static void read(std::istream& is, size_t n, _custom_fixed_value& v)
+    {
+        assert(n == 1);
+        char bv = -1;
+        is.read(&bv, 1);
+
+        switch (bv)
+        {
+            case 0:
+                v.value_string = "zero";
+                break;
+            case 1:
+                v.value_string = "one";
+                break;
+            case 2:
+                v.value_string = "two";
+                break;
+            case 3:
+                v.value_string = "three";
+                break;
+            default:
+                v.value_string = "???";
+        }
+    }
+};
+
+void test1()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test1");
+    packed_int_map_type empty_db;
+
+    std::string saved_state;
+
+    {
+        std::ostringstream state;
+        empty_db.save_state(state);
+        saved_state = state.str();
+    }
+
+    packed_int_map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state(state);
+    }
+
+    assert(restored == empty_db);
+}
+
+void test2()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test2");
+    packed_int_map_type::entry entries[] = {
+        {MDDS_ASCII("bruce"), 5}, {MDDS_ASCII("charlie"), 6}, {MDDS_ASCII("charlotte"), 7},
+        {MDDS_ASCII("david"), 8}, {MDDS_ASCII("dove"), 9},
+    };
+
+    packed_int_map_type db(entries, std::size(entries));
+
+    std::string saved_state;
+
+    {
+        std::ostringstream state;
+        db.save_state(state);
+        saved_state = state.str();
+    }
+
+    packed_int_map_type restored;
+    assert(restored != db);
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state(state);
+    }
+
+    assert(restored == db);
+}
+
+void test3()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test3");
+    std::vector<packed_str_map_type::entry> entries = {
+        {MDDS_ASCII("Abby"), "ABBY"},
+        {MDDS_ASCII("Ashley"), "ASHLEY"},
+        {MDDS_ASCII("Candelaria"), "CANDELARIA"},
+        {MDDS_ASCII("Carita"), "CARITA"},
+        {MDDS_ASCII("Christal"), "CHRISTAL"},
+        {MDDS_ASCII("Cory"), "CORY"},
+        {MDDS_ASCII("Estrella"), "ESTRELLA"},
+        {MDDS_ASCII("Etha"), "ETHA"},
+        {MDDS_ASCII("Harley"), "HARLEY"},
+        {MDDS_ASCII("Irish"), "IRISH"},
+        {MDDS_ASCII("Kiara"), "KIARA"},
+        {MDDS_ASCII("Korey"), "KOREY"},
+        {MDDS_ASCII("Laurene"), "LAURENE"},
+        {MDDS_ASCII("Michiko"), "MICHIKO"},
+        {MDDS_ASCII("Miriam"), "MIRIAM"},
+        {MDDS_ASCII("Mitzi"), "MITZI"},
+        {MDDS_ASCII("Seth"), "SETH"},
+        {MDDS_ASCII("Sindy"), "SINDY"},
+        {MDDS_ASCII("Tawanna"), "TAWANNA"},
+        {MDDS_ASCII("Tyra"), "TYRA"},
+    };
+
+    packed_str_map_type db(entries.data(), entries.size());
+
+    // Run some search.
+    auto results = db.prefix_search("Mi");
+    auto it = results.begin();
+    assert(it != results.end());
+    assert(it->first == "Michiko");
+    assert(it->second == "MICHIKO");
+    ++it;
+    assert(it != results.end());
+    assert(it->first == "Miriam");
+    assert(it->second == "MIRIAM");
+    ++it;
+    assert(it != results.end());
+    assert(it->first == "Mitzi");
+    assert(it->second == "MITZI");
+    ++it;
+    assert(it == results.end());
+
+    std::string saved_state;
+
+    {
+        std::ostringstream state;
+        db.save_state(state);
+        saved_state = state.str();
+    }
+
+    packed_str_map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state(state);
+    }
+
+    assert(db == restored);
+}
+
+void test4()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test4");
+    using map_type = packed_trie_map<trie::std_string_traits, std::vector<int64_t>>;
+
+    std::vector<map_type::entry> entries = {
+        {MDDS_ASCII("Abby"), {65, 98, 98, 121}},
+        {MDDS_ASCII("Ashley"), {65, 115, 104, 108, 101, 121}},
+        {MDDS_ASCII("Christal"), {67, 104, 114, 105, 115, 116, 97, 108}},
+        {MDDS_ASCII("Cory"), {67, 111, 114, 121}},
+        {MDDS_ASCII("Harley"), {72, 97, 114, 108, 101, 121}},
+        {MDDS_ASCII("Kiara"), {75, 105, 97, 114, 97}},
+        {MDDS_ASCII("Mitzi"), {77, 105, 116, 122, 105}},
+    };
+
+    map_type db(entries.data(), entries.size());
+    assert(db.size() == entries.size());
+
+    std::string saved_state;
+    {
+        std::ostringstream state;
+        db.save_state(state);
+        saved_state = state.str();
+    }
+
+    map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state(state);
+    }
+
+    assert(db == restored);
+}
+
+void test5()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test5");
+    using map_type = packed_trie_map<trie::std_string_traits, float>;
+
+    std::vector<map_type::entry> entries = {
+        {MDDS_ASCII("Abby"), 1.0f},  {MDDS_ASCII("Ashley"), 1.1f}, {MDDS_ASCII("Christal"), 1.2f},
+        {MDDS_ASCII("Cory"), 1.3f},  {MDDS_ASCII("Harley"), 1.4f}, {MDDS_ASCII("Kiara"), 1.5f},
+        {MDDS_ASCII("Mitzi"), 1.6f},
+    };
+
+    map_type db(entries.data(), entries.size());
+    assert(db.size() == entries.size());
+
+    std::string saved_state;
+    {
+        std::ostringstream state;
+        db.save_state(state);
+        saved_state = state.str();
+    }
+
+    map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state(state);
+    }
+
+    assert(db == restored);
+}
+
+template<typename SeqT>
+void test6()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test6");
+    using map_type = packed_trie_map<trie::std_string_traits, SeqT>;
+
+    std::vector<typename map_type::entry> entries = {
+        {MDDS_ASCII("Abby"), {65.0, 98.1, 98.2, 121.3}},
+        {MDDS_ASCII("Ashley"), {65.0, 11.5, 1.04, 1.08, .101, .12586}},
+        {MDDS_ASCII("Christal"), {67.0, -10.4, -114.236}},
+        {MDDS_ASCII("Cory"), {67.0, 122.111}},
+        {MDDS_ASCII("Harley"), {72.0, 97.12, -1.114}},
+        {MDDS_ASCII("Kiara"), {75.0, 1.05, 9.7, 1.14, -97.5}},
+        {MDDS_ASCII("Mitzi"), {77.0, 10.5, 11.6, 1.22, 10.5}},
+    };
+
+    map_type db(entries.data(), entries.size());
+    assert(db.size() == entries.size());
+
+    std::string saved_state;
+    {
+        std::ostringstream state;
+        db.save_state(state);
+        saved_state = state.str();
+    }
+
+    map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state(state);
+    }
+
+    assert(db == restored);
+}
+
+void test7()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test7");
+    using map_type = packed_trie_map<trie::std_string_traits, _custom_variable_value>;
+
+    std::vector<map_type::entry> entries = {
+        {MDDS_ASCII("Alan"), 1.2f},        {MDDS_ASCII("Cory"), -125},   {MDDS_ASCII("Eleni"), 966},
+        {MDDS_ASCII("Evia"), -0.987f},     {MDDS_ASCII("Nathaniel"), 0}, {MDDS_ASCII("Rebbecca"), 1.234f},
+        {MDDS_ASCII("Rodrick"), 34253536}, {MDDS_ASCII("Stuart"), 12},   {MDDS_ASCII("Verline"), 56},
+    };
+
+    map_type db(entries.data(), entries.size());
+    assert(db.size() == entries.size());
+
+    std::string saved_state;
+    {
+        std::ostringstream state;
+        db.save_state<_custom_variable_serializer>(state);
+        saved_state = state.str();
+    }
+
+    map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state<_custom_variable_serializer>(state);
+    }
+
+    assert(db == restored);
+}
+
+void test8()
+{
+    stack_printer __stack_printer__("trie_packed_test_save_and_load_state::test8");
+    using map_type = packed_trie_map<trie::std_string_traits, _custom_fixed_value>;
+
+    std::vector<map_type::entry> entries = {
+        {MDDS_ASCII("Bernardine"), "zero"}, {MDDS_ASCII("Donny"), "two"},     {MDDS_ASCII("Julia"), "one"},
+        {MDDS_ASCII("Lindsy"), "three"},    {MDDS_ASCII("Martine"), "three"}, {MDDS_ASCII("Shana"), "two"},
+        {MDDS_ASCII("Sonia"), "zero"},      {MDDS_ASCII("Tracie"), "one"},    {MDDS_ASCII("Vanita"), "two"},
+        {MDDS_ASCII("Yung"), "zero"},
+    };
+
+    map_type db(entries.data(), entries.size());
+    assert(db.size() == entries.size());
+
+    std::string saved_state;
+    {
+        std::ostringstream state;
+        db.save_state<_custom_fixed_serializer>(state);
+        saved_state = state.str();
+    }
+
+    map_type restored;
+
+    {
+        std::istringstream state(saved_state);
+        restored.load_state<_custom_fixed_serializer>(state);
+    }
+
+    assert(db == restored);
+
+    // Run some query to make sure it is still functional.
+    auto it = restored.find("Tracie");
+    assert(it->first == "Tracie");
+    assert(it->second.value_string == "one");
+}
+
+void run()
+{
+    test1();
+    test2();
+    test3();
+    test4();
+    test5();
+    test6<std::vector<double>>();
+    test6<std::deque<double>>();
+    test6<std::list<double>>();
+    test7();
+    test8();
+}
+
+} // namespace trie_packed_test_save_and_load_state
+
+void trie_test1()
+{
+    stack_printer __stack_printer__("::trie_test1");
+
+    typedef trie_map<trie::std_string_traits, custom_string> trie_map_type;
+    typedef packed_trie_map<trie::std_string_traits, custom_string> packed_trie_map_type;
+
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+
+    assert(db.size() == 0);
+    db.insert(MDDS_ASCII("Barak"), custom_string("Obama"));
+    assert(db.size() == 1);
+    db.insert(MDDS_ASCII("Bob"), custom_string("Marley"));
+    assert(db.size() == 2);
+    db.insert(MDDS_ASCII("Hideki"), custom_string("Matsui"));
+    assert(db.size() == 3);
+
+    auto it = dbc.find(MDDS_ASCII("Barak"));
+    assert(it->first == "Barak");
+    custom_string res = it->second;
+    assert(res.data == "Obama");
+
+    res = dbc.find(MDDS_ASCII("Bob"))->second;
+    assert(res.data == "Marley");
+    res = dbc.find(MDDS_ASCII("Hideki"))->second;
+    assert(res.data == "Matsui");
+
+    // Non-existent key.
+    it = dbc.find(MDDS_ASCII("Von"));
+    assert(it == dbc.end());
+    it = dbc.find(MDDS_ASCII("Bar"));
+    assert(it == dbc.end());
+
+    // Perform prefix search on "B", which should return both "Barak" and "Bob".
+    // The results should be sorted.
+    {
+        auto matches = dbc.prefix_search(MDDS_ASCII("B"));
+        size_t n = std::distance(matches.begin(), matches.end());
+        assert(n == 2);
+        auto it2 = matches.begin();
+        assert(it2->first == "Barak");
+        assert(it2->second.data == "Obama");
+        ++it2;
+        assert(it2->first == "Bob");
+        assert(it2->second.data == "Marley");
+
+        matches = dbc.prefix_search(MDDS_ASCII("Hi"));
+        n = std::distance(matches.begin(), matches.end());
+        assert(n == 1);
+        it2 = matches.begin();
+        assert(it2->first == "Hideki");
+        assert(it2->second.data == "Matsui");
+
+        // Invalid prefix searches.
+        matches = dbc.prefix_search(MDDS_ASCII("Bad"));
+        assert(matches.begin() == matches.end());
+        matches = dbc.prefix_search(MDDS_ASCII("Foo"));
+        assert(matches.begin() == matches.end());
+    }
+
+    {
+        // Create a packed version from it, and make sure it still generates the
+        // same results.
+        packed_trie_map_type packed(dbc);
+        assert(packed.size() == dbc.size());
+
+        {
+            auto results = packed.prefix_search(MDDS_ASCII("B"));
+            size_t n = std::distance(results.begin(), results.end());
+            assert(n == 2);
+            auto it2 = results.begin();
+            assert(it2->first == "Barak");
+            assert(it2->second.data == "Obama");
+            ++it2;
+            assert(it2->first == "Bob");
+            assert(it2->second.data == "Marley");
+            ++it2;
+            assert(it2 == results.end());
+        }
+
+        {
+            auto results = dbc.prefix_search(MDDS_ASCII("Hi"));
+            size_t n = std::distance(results.begin(), results.end());
+            assert(n == 1);
+            auto it2 = results.begin();
+            assert(it2->first == "Hideki");
+            assert(it2->second.data == "Matsui");
+        }
+
+        // Invalid prefix searches.
+        auto results = dbc.prefix_search(MDDS_ASCII("Bad"));
+        assert(results.begin() == results.end());
+        results = dbc.prefix_search(MDDS_ASCII("Foo"));
+        assert(results.begin() == results.end());
+    }
+
+    {
+        auto packed = dbc.pack();
+        auto results = packed.prefix_search(MDDS_ASCII("B"));
+        size_t n = std::distance(results.begin(), results.end());
+        assert(n == 2);
+        auto it2 = results.begin();
+        assert(it2->first == "Barak");
+        assert(it2->second.data == "Obama");
+        ++it2;
+        assert(it2->first == "Bob");
+        assert(it2->second.data == "Marley");
+    }
+
+    // Erase an existing key.
+    bool erased = db.erase(MDDS_ASCII("Hideki"));
+    assert(erased);
+    assert(db.size() == 2);
+
+    it = dbc.find(MDDS_ASCII("Hideki"));
+    assert(it == dbc.end());
+
+    // Try to erase a key that doesn't exist.
+    erased = db.erase(MDDS_ASCII("Foo"));
+    assert(!erased);
+    assert(db.size() == 2);
+
+    // Clear the whole thing.
+    db.clear();
+    assert(db.size() == 0);
+}
+
+void trie_test2()
+{
+    stack_printer __stack_printer__("::trie_test2");
+    using key_trait = trie::std_container_traits<std::vector<uint16_t>>;
+    using map_type = trie_map<key_trait, int>;
+    using key_type = map_type::key_type;
+
+    auto print_key = [](const std::vector<uint16_t>& key, const char* msg) {
+        cout << msg << ": ";
+        std::copy(key.begin(), key.end(), std::ostream_iterator<uint16_t>(std::cout, " "));
+        cout << endl;
+    };
+
+    map_type db;
+    key_type key = {2393, 99, 32589, 107, 0, 65535};
+    print_key(key, "original");
+    int value = 1;
+    db.insert(key, value);
+    assert(db.size() == 1);
+    {
+        auto it = db.begin();
+        assert(it != db.end());
+        assert(it->first == key);
+
+        print_key(it->first, "from trie_map");
+    }
+
+    auto packed = db.pack();
+    assert(packed.size() == 1);
+
+    {
+        auto it = packed.begin();
+        assert(it != packed.end());
+        print_key(it->first, "from packed_trie_map");
+        assert(it->first == key);
+    }
+}
+
+void trie_test_iterator_empty()
+{
+    stack_printer __stack_printer__("::trie_test_iterator_empty");
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+
+    // empty container
+    trie_map_type::const_iterator it = dbc.begin();
+    trie_map_type::const_iterator ite = dbc.end();
+
+    assert(it == ite);
+    assert(db.begin() == dbc.begin()); // non-const vs const iterators
+    assert(dbc.end() == db.end()); // const vs non-const iterators
+}
+
+void trie_test_iterator()
+{
+    stack_printer __stack_printer__("::trie_test_iterator");
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    using kv = trie_map_type::key_value_type;
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+
+    cout << "empty container" << endl;
+
+    // empty container
+    trie_map_type::const_iterator it = dbc.begin();
+    trie_map_type::const_iterator ite = dbc.end();
+
+    // The end iterator will never get invalidated since it only references
+    // the root node which will never get modified as long as the parent
+    // container is alive.
+
+    assert(it == ite);
+
+    cout << "one element" << endl;
+
+    db.insert(MDDS_ASCII("a"), 1);
+    it = dbc.begin();
+    assert(it != ite);
+    assert(*it == kv("a", 1));
+    ++it;
+    assert(it == ite);
+
+    cout << "two elements" << endl;
+
+    db.insert(MDDS_ASCII("ab"), 2);
+    it = dbc.begin();
+    assert(it != ite);
+    assert(*it == kv("a", 1));
+    ++it;
+    assert(it != ite);
+    assert(*it == kv("ab", 2));
+    ++it;
+    assert(it == ite);
+
+    cout << "more than two elements" << endl;
+
+    db.insert(MDDS_ASCII("aba"), 3);
+    db.insert(MDDS_ASCII("abb"), 4);
+    db.insert(MDDS_ASCII("abc"), 5);
+    db.insert(MDDS_ASCII("bc"), 6);
+    db.insert(MDDS_ASCII("bcd"), 7);
+
+    it = dbc.begin();
+    assert(*it == kv("a", 1));
+    ++it;
+    assert(*it == kv("ab", 2));
+    ++it;
+    assert(*it == kv("aba", 3));
+    ++it;
+    assert(*it == kv("abb", 4));
+    ++it;
+    assert(*it == kv("abc", 5));
+    ++it;
+    assert(*it == kv("bc", 6));
+    ++it;
+    assert(*it == kv("bcd", 7));
+    assert(it->first == "bcd");
+    assert(it->second == 7);
+    ++it;
+    assert(it == ite);
+
+    --it;
+    assert(it != ite);
+    assert(*it == kv("bcd", 7));
+    --it;
+    assert(*it == kv("bc", 6));
+    --it;
+    assert(*it == kv("abc", 5));
+    --it;
+    assert(*it == kv("abb", 4));
+    --it;
+    assert(*it == kv("aba", 3));
+    --it;
+    assert(*it == kv("ab", 2));
+    --it;
+    assert(*it == kv("a", 1));
+    assert(it == dbc.begin());
+    ++it;
+    assert(*it == kv("ab", 2));
+    ++it;
+    assert(*it == kv("aba", 3));
+    --it;
+    assert(*it == kv("ab", 2));
+    --it;
+    assert(*it == kv("a", 1));
+    ++it;
+    assert(*it == kv("ab", 2));
+    ++it;
+    assert(*it == kv("aba", 3));
+
+    assert(db.begin() != dbc.end()); // non-const vs const iterators
+    assert(dbc.begin() != db.end()); // const vs non-const iterators
+}
+
+void trie_test_iterator_with_erase()
+{
+    stack_printer __stack_printer__("::trie_test_iterator_with_erase");
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    using kv = trie_map_type::key_value_type;
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+    bool check_true = false;
+
+    db.insert(MDDS_ASCII("Python"), 1);
+    db.insert(MDDS_ASCII("C++"), 2);
+
+    auto it = dbc.begin(), ite = dbc.end();
+    check_true = (*it++ == kv("C++", 2));
+    assert(check_true);
+    check_true = (*it++ == kv("Python", 1));
+    assert(check_true);
+    assert(it == ite);
+
+    db.erase(MDDS_ASCII("C++"));
+    it = dbc.begin();
+    check_true = (*it++ == kv("Python", 1));
+    assert(check_true);
+    assert(it == ite);
+    check_true = (*(--it) == kv("Python", 1));
+    assert(check_true);
+    assert(it == dbc.begin());
+
+    db.clear();
+    assert(dbc.begin() == dbc.end());
+
+    db.insert(MDDS_ASCII("A"), 1);
+    db.insert(MDDS_ASCII("AB"), 2);
+    db.insert(MDDS_ASCII("ABC"), 3);
+    db.erase(MDDS_ASCII("AB"));
+
+    it = dbc.begin();
+    check_true = (*it++ == kv("A", 1));
+    assert(check_true);
+    check_true = (*it++ == kv("ABC", 3));
+    assert(check_true);
+    assert(it == ite);
+
+    check_true = (*(--it) == kv("ABC", 3));
+    assert(check_true);
+    check_true = (*(--it) == kv("A", 1));
+    assert(check_true);
+    assert(it == dbc.begin());
+
+    db.clear();
+    db.insert(MDDS_ASCII("A"), 1);
+    db.insert(MDDS_ASCII("AB"), 2);
+    db.insert(MDDS_ASCII("ABC"), 3);
+    db.erase(MDDS_ASCII("ABC"));
+
+    it = dbc.begin();
+    check_true = (*it++ == kv("A", 1));
+    assert(check_true);
+    check_true = (*it++ == kv("AB", 2));
+    assert(check_true);
+    assert(it == ite);
+
+    check_true = (*(--it) == kv("AB", 2));
+    assert(check_true);
+    check_true = (*(--it) == kv("A", 1));
+    assert(check_true);
+    assert(it == dbc.begin());
+
+    it = ite;
+    --it;
+    assert(*it-- == kv("AB", 2)); // test post-decrement operator.
+    assert(*it == kv("A", 1));
+}
+
+void trie_test_find_iterator()
+{
+    stack_printer __stack_printer__("::trie_test_find_iterator");
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+
+    db.insert(MDDS_ASCII("a"), 1);
+    db.insert(MDDS_ASCII("aa"), 2);
+    db.insert(MDDS_ASCII("ab"), 3);
+    db.insert(MDDS_ASCII("b"), 4);
+    {
+        auto it = dbc.find(MDDS_ASCII("a"));
+        assert(it->first == "a");
+        assert(it->second == 1);
+        ++it;
+        assert(it->first == "aa");
+        assert(it->second == 2);
+        ++it;
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == dbc.end());
+
+        it = dbc.find(MDDS_ASCII("aa"));
+        assert(it->first == "aa");
+        assert(it->second == 2);
+        ++it;
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == dbc.end());
+
+        it = dbc.find(MDDS_ASCII("ab"));
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == dbc.end());
+
+        it = dbc.find(MDDS_ASCII("b"));
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == dbc.end());
+    }
+
+    trie_map_type::packed_type packed = db.pack();
+    {
+        auto it = packed.find(MDDS_ASCII("a"));
+        assert(it->first == "a");
+        assert(it->second == 1);
+        ++it;
+        assert(it->first == "aa");
+        assert(it->second == 2);
+        ++it;
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == packed.end());
+
+        it = packed.find(MDDS_ASCII("aa"));
+        assert(it->first == "aa");
+        assert(it->second == 2);
+        ++it;
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == packed.end());
+
+        it = packed.find(MDDS_ASCII("ab"));
+        assert(it->first == "ab");
+        assert(it->second == 3);
+        ++it;
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == packed.end());
+
+        it = packed.find(MDDS_ASCII("b"));
+        assert(it->first == "b");
+        assert(it->second == 4);
+        ++it;
+        assert(it == packed.end());
+    }
+}
+
+void trie_test_prefix_search()
+{
+    stack_printer __stack_printer__("::trie_test_prefix_search");
+
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+
+    db.insert(MDDS_ASCII("a"), 1);
+    db.insert(MDDS_ASCII("aa"), 2);
+    db.insert(MDDS_ASCII("ab"), 3);
+    db.insert(MDDS_ASCII("b"), 4);
+
+    cout << "Performing prefix search on 'a'..." << endl;
+
+    trie_map_type::search_results results = dbc.prefix_search(MDDS_ASCII("a"));
+    auto it = results.begin();
+    auto ite = results.end();
+    assert(it != ite);
+    assert(it->first == "a");
+    assert(it->second == 1);
+    ++it;
+    assert(it->first == "aa");
+    assert(it->second == 2);
+    ++it;
+    assert(it->first == "ab");
+    assert(it->second == 3);
+    ++it;
+    assert(it == ite);
+    size_t n = std::distance(results.begin(), results.end());
+    assert(n == 3);
+
+    cout << "Performing prefix search on 'b'..." << endl;
+
+    results = dbc.prefix_search(MDDS_ASCII("b"));
+    it = results.begin();
+    ite = results.end();
+    assert(it != ite);
+    assert(it->first == "b");
+    assert(it->second == 4);
+    ++it;
+    assert(it == ite);
+    --it;
+    assert(it->first == "b");
+    assert(it->second == 4);
+    n = std::distance(results.begin(), results.end());
+    assert(n == 1);
+
+    // Only one element.
+    db.clear();
+    db.insert(MDDS_ASCII("dust"), 10);
+
+    cout << "Performing prefix search on 'du'..." << endl;
+
+    results = dbc.prefix_search(MDDS_ASCII("du"));
+    it = results.begin();
+    assert(it->first == "dust");
+    assert(it->second == 10);
+    bool check_true = (++it == results.end());
+    assert(check_true);
+    --it;
+    assert(it->first == "dust");
+    assert(it->second == 10);
+    n = std::distance(results.begin(), results.end());
+    assert(n == 1);
+}
+
+void trie_test_key_as_input()
+{
+    stack_printer __stack_printer__("::trie_test_key_as_input");
+
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+    const trie_map_type& dbc = db;
+
+    db.insert(std::string("string as key"), 1);
+    db.insert("literal as key", 2);
+
+    auto it = dbc.find("literal as key");
+    assert(it != dbc.end());
+    assert(it->first == "literal as key");
+    assert(it->second == 2);
+
+    auto results = dbc.prefix_search("str");
+    auto rit = results.begin();
+    assert(rit != results.end());
+    assert(rit->first == "string as key");
+    assert(rit->second == 1);
+    ++rit;
+    assert(rit == results.end());
+}
+
+void trie_test_copying()
+{
+    stack_printer __stack_printer__("::trie_test_copying");
+
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+    assert(db.empty());
+
+    {
+        auto db_copied(db);
+        assert(db_copied.empty());
+    }
+
+    db.insert("twenty", 20);
+    db.insert("twelve", 12);
+    assert(db.size() == 2);
+
+    {
+        // copy constructor
+        auto db_copied(db);
+        const trie_map_type& dbc_copied = db_copied;
+        assert(db_copied.size() == 2);
+
+        auto it = dbc_copied.find("twenty");
+        assert(it != dbc_copied.end());
+        assert(it->first == "twenty");
+        assert(it->second == 20);
+
+        it = dbc_copied.find("twelve");
+        assert(it != dbc_copied.end());
+        assert(it->first == "twelve");
+        assert(it->second == 12);
+    }
+
+    {
+        // copy assignment
+        trie_map_type db_copied;
+        db_copied = db;
+        const trie_map_type& dbc_copied = db_copied;
+        assert(db_copied.size() == 2);
+
+        auto it = dbc_copied.find("twenty");
+        assert(it != dbc_copied.end());
+        assert(it->first == "twenty");
+        assert(it->second == 20);
+
+        it = dbc_copied.find("twelve");
+        assert(it != dbc_copied.end());
+        assert(it->first == "twelve");
+        assert(it->second == 12);
+    }
+
+    {
+        // move constructor
+        auto db_copied(db);
+        auto db_moved(std::move(db_copied));
+        const trie_map_type& dbc_moved = db_moved;
+        assert(db_moved.size() == 2);
+        assert(db_copied.empty());
+
+        auto it = dbc_moved.find("twenty");
+        assert(it != dbc_moved.end());
+        assert(it->first == "twenty");
+        assert(it->second == 20);
+
+        it = dbc_moved.find("twelve");
+        assert(it != dbc_moved.end());
+        assert(it->first == "twelve");
+        assert(it->second == 12);
+    }
+
+    {
+        // move assignment
+        auto db_copied(db);
+        trie_map_type db_moved;
+        db_moved = std::move(db_copied);
+        const trie_map_type& dbc_moved = db_moved;
+        assert(db_moved.size() == 2);
+        assert(db_copied.empty());
+
+        auto it = dbc_moved.find("twenty");
+        assert(it != dbc_moved.end());
+        assert(it->first == "twenty");
+        assert(it->second == 20);
+
+        it = dbc_moved.find("twelve");
+        assert(it != dbc_moved.end());
+        assert(it->first == "twelve");
+        assert(it->second == 12);
+    }
+}
+
+void trie_test_value_update_from_iterator()
+{
+    stack_printer __stack_printer__("::trie_test_value_update_from_iterator");
+
+    typedef trie_map<trie::std_string_traits, int> trie_map_type;
+    trie_map_type db;
+    db.insert("one", 1);
+    db.insert("two", 2);
+    db.insert("three", 3);
+
+    trie_map_type::iterator it = db.begin();
+    assert(it->first == "one");
+    assert(it->second == 1);
+    it->second = 10; // update the value.
+    it = db.begin();
+    assert(it->first == "one");
+    assert(it->second == 10);
+
+    it = db.find("three");
+    assert(it->first == "three");
+    assert(it->second == 3);
+    it->second = 345; // update the value again.
+    it = db.find("three");
+    assert(it->first == "three");
+    assert(it->second == 345);
+}
+
+int main()
+{
+    try
+    {
+        trie_packed_test1();
+        trie_packed_test2();
+        trie_packed_test3();
+        trie_packed_test4();
+        trie_packed_test_value_life_cycle();
+        trie_packed_test_custom_string();
+        trie_packed_test_iterator_empty();
+        trie_packed_test_iterator();
+        trie_packed_test_prefix_search1();
+        trie_packed_test_key_as_input();
+        trie_packed_test_copying();
+        trie_packed_test_non_equal();
+        trie_packed_test_save_and_load_state::run();
+
+        trie_test1();
+        trie_test2();
+
+        trie_test_iterator_empty();
+        trie_test_iterator();
+        trie_test_iterator_with_erase();
+        trie_test_find_iterator();
+        trie_test_prefix_search();
+        trie_test_key_as_input();
+        trie_test_copying();
+        trie_test_value_update_from_iterator();
+    }
+    catch (const std::exception& e)
+    {
+        cout << "Test failed: " << e.what() << endl;
+        return EXIT_FAILURE;
+    }
+
+    cout << "Test finished successfully!" << endl;
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */