vendor/libc++/libc++-trunk-r290819

1 files changed, 38 insertions, 0 deletions

diff --git a/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp b/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp
new file mode 100644
index 000000000000..84bb29fabac8
--- /dev/null
+++ b/test/std/utilities/optional/optional.nullopt/nullopt_t.pass.cpp
@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+// <optional>
+
+// struct nullopt_t{see below};
+// constexpr nullopt_t nullopt(unspecified);
+
+#include <optional>
+#include <type_traits>
+
+using std::optional;
+using std::nullopt_t;
+using std::nullopt;
+
+constexpr
+int
+test(const nullopt_t&)
+{
+    return 3;
+}
+
+int main()
+{
+    static_assert((std::is_class<nullopt_t>::value), "");
+    static_assert((std::is_empty<nullopt_t>::value), "");
+    static_assert((std::is_literal_type<nullopt_t>::value), "");
+    static_assert((!std::is_default_constructible<nullopt_t>::value), "");
+
+    static_assert(test(nullopt) == 3, "");
+}