1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
10
11// <functional>
12
13// negate
14
15#include <functional>
16#include <type_traits>
17#include <cassert>
18
19#include "test_macros.h"
20
21int main(int, char**)
22{
23 typedef std::negate<int> F;
24 const F f = F();
25#if TEST_STD_VER <= 17
26 static_assert((std::is_same<F::argument_type, int>::value), "" );
27 static_assert((std::is_same<F::result_type, int>::value), "" );
28#endif
29 assert(f(36) == -36);
30#if TEST_STD_VER > 11
31 typedef std::negate<> F2;
32 const F2 f2 = F2();
33 assert(f2(36) == -36);
34 assert(f2(36L) == -36);
35 assert(f2(36.0) == -36);
36
37 constexpr int foo = std::negate<int> () (3);
38 static_assert ( foo == -3, "" );
39
40 constexpr double bar = std::negate<> () (3.0);
41 static_assert ( bar == -3.0, "" );
42#endif
43
44 return 0;
45}
46

source code of libcxx/test/std/utilities/function.objects/arithmetic.operations/negate.pass.cpp