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55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <chrono>
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// time_point
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// template <class Clock, class Duration1, class Rep2, class Period2>
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// time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type>
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// operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
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#include <chrono>
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#include <cassert>
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#include "test_macros.h"
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template <class D>
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void test2739() // LWG2739
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{
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typedef std::chrono::time_point<std::chrono::system_clock> TimePoint;
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typedef std::chrono::duration<D> Dur;
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const Dur d(5);
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TimePoint t0 = std::chrono::system_clock::from_time_t(200);
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TimePoint t1 = t0 - d;
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assert(t1 < t0);
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}
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int main(int, char**)
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{
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typedef std::chrono::system_clock Clock;
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typedef std::chrono::milliseconds Duration1;
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typedef std::chrono::microseconds Duration2;
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{
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std::chrono::time_point<Clock, Duration1> t1(Duration1(3));
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std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);
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assert(t2.time_since_epoch() == Duration2(2995));
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}
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#if TEST_STD_VER > 11
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{
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constexpr std::chrono::time_point<Clock, Duration1> t1(Duration1(3));
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constexpr std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);
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static_assert(t2.time_since_epoch() == Duration2(2995), "");
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}
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#endif
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test2739<int32_t>();
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test2739<uint32_t>();
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return 0;
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}
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