1 files changed, 80 insertions, 0 deletions
diff --git a/test/std/utilities/utility/forward/forward.pass.cpp b/test/std/utilities/utility/forward/forward.pass.cpp
new file mode 100644
index 000000000000..357b36fafa96
--- /dev/null
+++ b/test/std/utilities/utility/forward/forward.pass.cpp
@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// test forward
+
+#include <utility>
+#include <cassert>
+
+struct A
+{
+};
+
+A source() {return A();}
+const A csource() {return A();}
+
+typedef char one;
+struct two {one _[2];};
+struct four {one _[4];};
+struct eight {one _[8];};
+
+one test(A&);
+two test(const A&);
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+four test(A&&);
+eight test(const A&&);
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+int main()
+{
+    A a;
+    const A ca = A();
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    static_assert(sizeof(test(std::forward<A&>(a))) == 1, "");
+    static_assert(sizeof(test(std::forward<A>(a))) == 4, "");
+    static_assert(sizeof(test(std::forward<A>(source()))) == 4, "");
+
+    static_assert(sizeof(test(std::forward<const A&>(a))) == 2, "");
+//    static_assert(sizeof(test(std::forward<const A&>(source()))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A>(a))) == 8, "");
+    static_assert(sizeof(test(std::forward<const A>(source()))) == 8, "");
+
+    static_assert(sizeof(test(std::forward<const A&>(ca))) == 2, "");
+//    static_assert(sizeof(test(std::forward<const A&>(csource()))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A>(ca))) == 8, "");
+    static_assert(sizeof(test(std::forward<const A>(csource()))) == 8, "");
+
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    static_assert(sizeof(test(std::forward<A&>(a))) == 1, "");
+    static_assert(sizeof(test(std::forward<A>(a))) == 1, "");
+//    static_assert(sizeof(test(std::forward<A>(source()))) == 2, "");
+
+    static_assert(sizeof(test(std::forward<const A&>(a))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A&>(source()))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A>(a))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A>(source()))) == 2, "");
+
+    static_assert(sizeof(test(std::forward<const A&>(ca))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A&>(csource()))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A>(ca))) == 2, "");
+    static_assert(sizeof(test(std::forward<const A>(csource()))) == 2, "");
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+#if _LIBCPP_STD_VER > 11
+    constexpr int i1 = std::move(23);
+    static_assert(i1 == 23, "" );
+    constexpr int i2 = std::forward<int>(42);
+    static_assert(i2 == 42, "" );
+#endif
+}