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diff --git a/example/flat_segment_tree_itrs.cpp b/example/flat_segment_tree_itrs.cpp
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+++ b/example/flat_segment_tree_itrs.cpp
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+/* -*- 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 <mdds/flat_segment_tree.hpp>
+#include <iostream>
+
+using fst_type = mdds::flat_segment_tree<long, int>;
+
+void iterate_nodes(const fst_type& db)
+{
+    //!code-start: iterate-nodes
+    for (auto it = db.begin(); it != db.end(); ++it)
+    {
+        std::cout << "key: " << it->first << "; value: " << it->second << std::endl;
+    }
+    //!code-end: iterate-nodes
+}
+
+void loop_nodes(const fst_type& db)
+{
+    //!code-start: loop-nodes
+    for (const auto& node : db)
+    {
+        std::cout << "key: " << node.first << "; value: " << node.second << std::endl;
+    }
+    //!code-end: loop-nodes
+}
+
+void iterate_segments(const fst_type& db)
+{
+    //!code-start: iterate-segments
+    for (auto it = db.begin_segment(); it != db.end_segment(); ++it)
+    {
+        std::cout << "start: " << it->start << "; end: " << it->end << "; value: " << it->value << std::endl;
+    }
+    //!code-end: iterate-segments
+}
+
+void loop_segments(const fst_type& db)
+{
+    //!code-start: loop-segments
+    for (const auto& segment : db.segment_range())
+    {
+        std::cout << "start: " << segment.start << "; end: " << segment.end << "; value: " << segment.value << std::endl;
+    }
+    //!code-end: loop-segments
+}
+
+int main()
+{
+    fst_type db(0, 500, 0);
+
+    db.insert_front(10, 20, 10);
+    db.insert_back(50, 70, 15);
+    db.insert_back(60, 65, 5);
+
+    iterate_nodes(db);
+    loop_nodes(db);
+    iterate_segments(db);
+    loop_segments(db);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */