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// minus
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::minus<int> F;
24 const F f = F();
25#if TEST_STD_VER <= 17
26 static_assert((std::is_same<int, F::first_argument_type>::value), "" );
27 static_assert((std::is_same<int, F::second_argument_type>::value), "" );
28 static_assert((std::is_same<int, F::result_type>::value), "" );
29#endif
30 assert(f(3, 2) == 1);
31#if TEST_STD_VER > 11
32 typedef std::minus<> F2;
33 const F2 f2 = F2();
34 assert(f2(3,2) == 1);
35 assert(f2(3.0, 2) == 1);
36 assert(f2(3, 2.5) == 0.5);
37
38 constexpr int foo = std::minus<int> () (3, 2);
39 static_assert ( foo == 1, "" );
40
41 constexpr double bar = std::minus<> () (3.0, 2);
42 static_assert ( bar == 1.0, "" );
43#endif
44
45 return 0;
46}
47

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