libcxx/test/std/time/time.point/time.point.nonmember/op_-duration.pass.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // "unable to find library from dependent library specifier: rt"
  10 // XFAIL: LIBCXX-PICOLIBC-FIXME
  11
  12 // <chrono>
  13
  14 // time_point
  15
  16 // template <class Clock, class Duration1, class Rep2, class Period2>
  17 //   time_point<Clock, typename common_type<Duration1, duration<Rep2, Period2>>::type>
  18 //   operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
  19
  20 #include <chrono>
  21 #include <cassert>
  22 #include <cstdint>
  23
  24 #include "test_macros.h"
  25
  26 template <class D>
  27 void test2739()  // LWG2739
  28 {
  29     typedef std::chrono::time_point<std::chrono::system_clock> TimePoint;
  30     typedef std::chrono::duration<D> Dur;
  31     const Dur d(5);
  32     TimePoint t0 = std::chrono::system_clock::from_time_t(200);
  33     TimePoint t1 = t0 - d;
  34     assert(t1 < t0);
  35 }
  36
  37 int main(int, char**)
  38 {
  39     typedef std::chrono::system_clock Clock;
  40     typedef std::chrono::milliseconds Duration1;
  41     typedef std::chrono::microseconds Duration2;
  42     {
  43     std::chrono::time_point<Clock, Duration1> t1(Duration1(3));
  44     std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);
  45     assert(t2.time_since_epoch() == Duration2(2995));
  46     }
  47 #if TEST_STD_VER > 11
  48     {
  49     constexpr std::chrono::time_point<Clock, Duration1> t1(Duration1(3));
  50     constexpr std::chrono::time_point<Clock, Duration2> t2 = t1 - Duration2(5);
  51     static_assert(t2.time_since_epoch() == Duration2(2995), "");
  52     }
  53 #endif
  54     test2739<std::int32_t>();
  55     test2739<std::uint32_t>();
  56
  57   return 0;
  58 }