libcxx/test/std/time/time.duration/time.duration.cast/round.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 // UNSUPPORTED: c++03, c++11, c++14
  10 // <chrono>
  11
  12 // round
  13
  14 // template <class ToDuration, class Rep, class Period>
  15 //   constexpr
  16 //   ToDuration
  17 //   ceil(const duration<Rep, Period>& d);
  18
  19 #include <chrono>
  20 #include <type_traits>
  21 #include <cassert>
  22
  23 #include "test_macros.h"
  24
  25 template <class ToDuration, class FromDuration>
  26 void
  27 test(const FromDuration& f, const ToDuration& d)
  28 {
  29     {
  30     typedef decltype(std::chrono::round<ToDuration>(f)) R;
  31     static_assert((std::is_same<R, ToDuration>::value), "");
  32     assert(std::chrono::round<ToDuration>(f) == d);
  33     }
  34 }
  35
  36 int main(int, char**)
  37 {
  38 //  7290000ms is 2 hours, 1 minute, and 30 seconds
  39     test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
  40     test(std::chrono::milliseconds(-7290000), std::chrono::hours(-2));
  41     test(std::chrono::milliseconds( 7290000), std::chrono::minutes( 122));
  42     test(std::chrono::milliseconds(-7290000), std::chrono::minutes(-122));
  43
  44     {
  45 //  9000000ms is 2 hours and 30 minutes
  46     constexpr std::chrono::hours h1 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(9000000));
  47     static_assert(h1.count() == 2, "");
  48     constexpr std::chrono::hours h2 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(-9000000));
  49     static_assert(h2.count() == -2, "");
  50     }
  51
  52   return 0;
  53 }