1 files changed, 25 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/flatten.cpp b/src/boost/libs/hana/example/flatten.cpp
new file mode 100644
index 000000000..61c3d272c
--- /dev/null
+++ b/src/boost/libs/hana/example/flatten.cpp
@@ -0,0 +1,25 @@
+// 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/equal.hpp>
+#include <boost/hana/flatten.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/tuple.hpp>
+namespace hana = boost::hana;
+
+
+static_assert(
+    hana::flatten(hana::make_tuple(hana::make_tuple(1, 2, 3),
+                                   hana::make_tuple(4, 5),
+                                   hana::make_tuple(6, 7, 8, 9)))
+    ==
+    hana::make_tuple(1, 2, 3, 4, 5, 6, 7, 8, 9)
+, "");
+
+BOOST_HANA_CONSTANT_CHECK(hana::flatten(hana::nothing) == hana::nothing);
+static_assert(hana::flatten(hana::just(hana::just(1))) == hana::just(1), "");
+BOOST_HANA_CONSTANT_CHECK(hana::flatten(hana::just(hana::nothing)) == hana::nothing);
+
+int main() { }