Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/utilities/function.objects/bitwise.operations/bit_not.pass.cpp

@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// bit_not
+
+#include <functional>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    typedef std::bit_not<int> F;
+    const F f = F();
+    static_assert((std::is_base_of<std::unary_function<int, int>, F>::value), "");
+    assert((f(0xEA95) & 0xFFFF ) == 0x156A);
+    assert((f(0x58D3) & 0xFFFF ) == 0xA72C);
+    assert((f(0)      & 0xFFFF ) == 0xFFFF);
+    assert((f(0xFFFF) & 0xFFFF ) == 0);
+
+    typedef std::bit_not<> F2;
+    const F2 f2 = F2();
+    assert((f2(0xEA95)  & 0xFFFF ) == 0x156A);
+    assert((f2(0xEA95L) & 0xFFFF ) == 0x156A);
+    assert((f2(0x58D3)  & 0xFFFF ) == 0xA72C);
+    assert((f2(0x58D3L) & 0xFFFF ) == 0xA72C);
+    assert((f2(0)       & 0xFFFF ) == 0xFFFF);
+    assert((f2(0L)      & 0xFFFF ) == 0xFFFF);
+    assert((f2(0xFFFF)  & 0xFFFF ) == 0);
+    assert((f2(0xFFFFL)  & 0xFFFF ) == 0);
+
+    constexpr int foo = std::bit_not<int> () (0xEA95) & 0xFFFF;
+    static_assert ( foo == 0x156A, "" );
+
+    constexpr int bar = std::bit_not<> () (0xEA95) & 0xFFFF;
+    static_assert ( bar == 0x156A, "" );
+#endif
+}