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// <chrono>
10
11// duration
12
13// constexpr common_type_t<duration> operator-() const;
14
15#include <chrono>
16#include <cassert>
17#include <ratio>
18#include <type_traits>
19
20#include "test_macros.h"
21
22int main(int, char**)
23{
24 {
25 const std::chrono::minutes m(3);
26 std::chrono::minutes m2 = -m;
27 assert(m2.count() == -m.count());
28 }
29#if TEST_STD_VER >= 11
30 {
31 constexpr std::chrono::minutes m(3);
32 constexpr std::chrono::minutes m2 = -m;
33 static_assert(m2.count() == -m.count(), "");
34 }
35#endif
36
37// P0548
38 {
39 typedef std::chrono::duration<int, std::ratio<10,10> > D10;
40 typedef std::chrono::duration<int, std::ratio< 1, 1> > D1;
41 D10 zero(0);
42 D10 one(1);
43 static_assert( (std::is_same< decltype(-one), decltype(zero-one) >::value), "");
44 static_assert( (std::is_same< decltype(zero-one), D1>::value), "");
45 static_assert( (std::is_same< decltype(-one), D1>::value), "");
46 static_assert( (std::is_same< decltype(+one), D1>::value), "");
47 }
48
49 return 0;
50}
51

source code of libcxx/test/std/time/time.duration/time.duration.arithmetic/op_-.pass.cpp