1 files changed, 33 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/optional/nested_type.cpp b/src/boost/libs/hana/test/optional/nested_type.cpp
new file mode 100644
index 000000000..6e85c2045
--- /dev/null
+++ b/src/boost/libs/hana/test/optional/nested_type.cpp
@@ -0,0 +1,33 @@
+// 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/optional.hpp>
+#include <boost/hana/type.hpp>
+
+#include <type_traits>
+namespace hana = boost::hana;
+
+
+// This test makes sure that an optional holding a hana::type has a
+// nested ::type alias.
+
+
+template <typename ...>
+using void_t = void;
+
+template <typename T, typename = void>
+struct has_type : std::false_type { };
+
+template <typename T>
+struct has_type<T, void_t<typename T::type>>
+    : std::true_type
+{ };
+
+
+struct T;
+
+static_assert(std::is_same<decltype(hana::just(hana::type_c<T>))::type, T>{}, "");
+static_assert(!has_type<decltype(hana::nothing)>{}, "");
+
+int main() { }