1 files changed, 78 insertions, 0 deletions
diff --git a/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp
new file mode 100644
index 000000000000..a049eab9a192
--- /dev/null
+++ b/test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp
@@ -0,0 +1,78 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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
+
+// type_traits
+
+// is_swappable_with
+
+#include <type_traits>
+#include <vector>
+#include "test_macros.h"
+
+namespace MyNS {
+
+struct A {
+  A(A const&) = delete;
+  A& operator=(A const&) = delete;
+};
+
+struct B {
+  B(B const&) = delete;
+  B& operator=(B const&) = delete;
+};
+
+struct C {};
+struct D {};
+
+void swap(A&, A&) {}
+
+void swap(A&, B&) {}
+void swap(B&, A&) {}
+
+void swap(A&, C&) {} // missing swap(C, A)
+void swap(D&, C&) {}
+
+struct M {};
+
+void swap(M&&, M&&) {}
+
+} // namespace MyNS
+
+int main()
+{
+    using namespace MyNS;
+    {
+        // Test that is_swappable_with doesn't apply an lvalue reference
+        // to the type. Instead it is up to the user.
+        static_assert(!std::is_swappable_with<int, int>::value, "");
+        static_assert(std::is_swappable_with<int&, int&>::value, "");
+        static_assert(std::is_swappable_with<M, M>::value, "");
+        static_assert(std::is_swappable_with<A&, A&>::value, "");
+    }
+    {
+        // test that heterogeneous swap is allowed only if both 'swap(A, B)' and
+        // 'swap(B, A)' are valid.
+        static_assert(std::is_swappable_with<A&, B&>::value, "");
+        static_assert(!std::is_swappable_with<A&, C&>::value, "");
+        static_assert(!std::is_swappable_with<D&, C&>::value, "");
+    }
+    {
+        // test that cv void is guarded against as required.
+        static_assert(!std::is_swappable_with_v<void, int>, "");
+        static_assert(!std::is_swappable_with_v<int, void>, "");
+        static_assert(!std::is_swappable_with_v<const void, const volatile void>, "");
+    }
+    {
+        // test for presence of is_swappable_with_v
+        static_assert(std::is_swappable_with_v<int&, int&>, "");
+        static_assert(!std::is_swappable_with_v<D&, C&>, "");
+    }
+}