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>
test2739()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
main()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