1 files changed, 14 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/optional/foldable.cpp b/src/boost/libs/hana/example/optional/foldable.cpp
new file mode 100644
index 000000000..21fc920c6
--- /dev/null
+++ b/src/boost/libs/hana/example/optional/foldable.cpp
@@ -0,0 +1,14 @@
+// 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/fold_right.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/plus.hpp>
+namespace hana = boost::hana;
+
+
+static_assert(hana::fold_right(hana::nothing, 1, hana::plus) == 1, "");
+static_assert(hana::fold_right(hana::just(4), 1, hana::plus) == 5, "");
+
+int main() { }