56 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <chrono>10 11// time_point12 13// template <class Clock, class Duration1, class Rep2, class Period2>14// time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type>15// operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);16 17#include <chrono>18#include <cassert>19#include <cstdint>20 21#include "test_macros.h"22 23template <class D>24void test2739() // LWG273925{26 typedef std::chrono::time_point<std::chrono::system_clock> TimePoint;27 typedef std::chrono::duration<D> Dur;28 const Dur d(5);29 TimePoint t0 = std::chrono::system_clock::from_time_t(200);30 TimePoint t1 = t0 - d;31 assert(t1 < t0);32}33 34int main(int, char**)35{36 typedef std::chrono::system_clock Clock;37 typedef std::chrono::milliseconds Duration1;38 typedef std::chrono::microseconds Duration2;39 {40 std::chrono::time_point<Clock, Duration1> t1(Duration1(3));41 std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);42 assert(t2.time_since_epoch() == Duration2(2995));43 }44#if TEST_STD_VER > 1145 {46 constexpr std::chrono::time_point<Clock, Duration1> t1(Duration1(3));47 constexpr std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);48 static_assert(t2.time_since_epoch() == Duration2(2995), "");49 }50#endif51 test2739<std::int32_t>();52 test2739<std::uint32_t>();53 54 return 0;55}56