1 files changed, 61 insertions, 0 deletions
diff --git a/libcxx/test/experimental/optional/optional.comp_with_t/less_than.pass.cpp b/libcxx/test/experimental/optional/optional.comp_with_t/less_than.pass.cpp
new file mode 100644
index 00000000000..e35df21bbab
--- /dev/null
+++ b/libcxx/test/experimental/optional/optional.comp_with_t/less_than.pass.cpp
@@ -0,0 +1,61 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <optional>
+
+// template <class T> constexpr bool operator<(const optional<T>& x, const T& v);
+// template <class T> constexpr bool operator<(const T& v, const optional<T>& x);
+
+#include <experimental/optional>
+
+#if _LIBCPP_STD_VER > 11
+
+using std::experimental::optional;
+
+struct X
+{
+    int i_;
+
+    constexpr X(int i) : i_(i) {}
+};
+
+constexpr bool operator < ( const X &lhs, const X &rhs )
+    { return lhs.i_ < rhs.i_ ; }
+    
+#endif
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+
+    {
+    typedef X T;
+    typedef optional<T> O;
+
+    constexpr T val(2);
+    constexpr O o1;       // disengaged
+    constexpr O o2{1};    // engaged
+    constexpr O o3{val};  // engaged
+
+    static_assert (  (o1 < T(1)), "" );
+    static_assert ( !(o2 < T(1)), "" );  // equal
+    static_assert ( !(o3 < T(1)), "" );
+    static_assert (  (o2 <  val), "" );
+    static_assert ( !(o3 <  val), "" );  // equal
+    static_assert (  (o3 < T(3)), "" );
+
+    static_assert (  !(T(1) < o1), "" );
+    static_assert (  !(T(1) < o2), "" ); // equal
+    static_assert (   (T(1) < o3), "" );
+    static_assert (  !(val  < o2), "" );
+    static_assert (  !(val  < o3), "" ); // equal
+    static_assert (  !(T(3) < o3), "" );
+    }
+#endif
+}