1 files changed, 64 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/group.cpp b/src/boost/libs/hana/example/group.cpp
new file mode 100644
index 000000000..9025cb0a3
--- /dev/null
+++ b/src/boost/libs/hana/example/group.cpp
@@ -0,0 +1,64 @@
+// Copyright Louis Dionne 2013-2017
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+#include <boost/hana/assert.hpp>
+#include <boost/hana/comparing.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/group.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/length.hpp>
+#include <boost/hana/range.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+namespace hana = boost::hana;
+
+
+// group without a predicate
+BOOST_HANA_CONSTANT_CHECK(
+    hana::group(hana::make_tuple(hana::int_c<1>, hana::long_c<1>, hana::type_c<int>, hana::char_c<'x'>, hana::char_c<'x'>))
+        == hana::make_tuple(
+            hana::make_tuple(hana::int_c<1>, hana::long_c<1>),
+            hana::make_tuple(hana::type_c<int>),
+            hana::make_tuple(hana::char_c<'x'>, hana::char_c<'x'>)
+        )
+);
+
+
+// group with a predicate
+constexpr auto tuples = hana::make_tuple(
+    hana::range_c<int, 0, 1>,
+    hana::range_c<int, 0, 2>,
+    hana::range_c<int, 1, 3>,
+    hana::range_c<int, 2, 6>
+);
+
+BOOST_HANA_CONSTANT_CHECK(
+    hana::group(tuples, hana::comparing(hana::length))
+        == hana::make_tuple(
+            hana::make_tuple(
+                hana::range_c<int, 0, 1>
+            ),
+            hana::make_tuple(
+                hana::range_c<int, 0, 2>,
+                hana::range_c<int, 1, 3>
+            ),
+            hana::make_tuple(
+                hana::range_c<int, 2, 6>
+            )
+        )
+);
+
+
+// group.by is syntactic sugar
+static_assert(
+    hana::group.by(hana::comparing(hana::typeid_),
+                   hana::make_tuple(1, 2, 3, 'x', 'y', 4.4, 5.5))
+        == hana::make_tuple(
+            hana::make_tuple(1, 2, 3),
+            hana::make_tuple('x', 'y'),
+            hana::make_tuple(4.4, 5.5)
+        )
+, "");
+
+int main() { }