1 files changed, 40 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/comparing.cpp b/src/boost/libs/hana/example/comparing.cpp
new file mode 100644
index 000000000..8c6538816
--- /dev/null
+++ b/src/boost/libs/hana/example/comparing.cpp
@@ -0,0 +1,40 @@
+// 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/comparing.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/group.hpp>
+#include <boost/hana/length.hpp>
+#include <boost/hana/range.hpp>
+#include <boost/hana/tuple.hpp>
+namespace hana = boost::hana;
+
+
+int main() {
+    constexpr auto sequences = hana::make_tuple(
+        hana::make_tuple(1, 2, 3),
+        hana::make_tuple('x', 'y', 'z'),
+        hana::range_c<long, 0, 1>,
+        hana::tuple_t<char, int>,
+        hana::range_c<int, 0, 2>,
+        hana::make_tuple(123.4, nullptr)
+    );
+
+    constexpr auto grouped = hana::group.by(hana::comparing(hana::length), sequences);
+
+    static_assert(grouped == hana::make_tuple(
+        hana::make_tuple(
+            hana::make_tuple(1, 2, 3),
+            hana::make_tuple('x', 'y', 'z')
+        ),
+        hana::make_tuple(
+            hana::range_c<long, 0, 1>
+        ),
+        hana::make_tuple(
+            hana::tuple_t<char, int>,
+            hana::range_c<int, 0, 2>,
+            hana::make_tuple(123.4, nullptr)
+        )
+    ), "");
+}