1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <chrono> 11 12 // time_point 13 14 // template <class Clock, class Duration1, class Rep2, class Period2> 15 // time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type> 16 // operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs); 17 18 #include <chrono> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 template <class D> 24 void test2739() // LWG2739 25 { 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 34 int main() 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 > 11 45 { 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 #endif 51 test2739<int32_t>(); 52 test2739<uint32_t>(); 53 } 54
