libcxx/test/std/time/time.duration/time.duration.alg/abs.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
  11 // <chrono>
  12
  13 // abs
  14
  15 // template <class Rep, class Period>
  16 //   constexpr duration<Rep, Period> abs(duration<Rep, Period> d)
  17
  18 #include <chrono>
  19 #include <cassert>
  20 #include <ratio>
  21 #include <type_traits>
  22
  23 #include "test_macros.h"
  24
  25 template <class Duration>
  26 void
  27 test(const Duration& f, const Duration& d)
  28 {
  29     {
  30     typedef decltype(std::chrono::abs(f)) R;
  31     static_assert((std::is_same<R, Duration>::value), "");
  32     assert(std::chrono::abs(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::milliseconds( 7290000));
  40     test(std::chrono::milliseconds(-7290000), std::chrono::milliseconds( 7290000));
  41     test(std::chrono::minutes( 122), std::chrono::minutes( 122));
  42     test(std::chrono::minutes(-122), std::chrono::minutes( 122));
  43     test(std::chrono::hours(0), std::chrono::hours(0));
  44
  45     {
  46 //  9000000ms is 2 hours and 30 minutes
  47     constexpr std::chrono::hours h1 = std::chrono::abs(std::chrono::hours(-3));
  48     static_assert(h1.count() == 3, "");
  49     constexpr std::chrono::hours h2 = std::chrono::abs(std::chrono::hours(3));
  50     static_assert(h2.count() == 3, "");
  51     }
  52
  53     {
  54 //  Make sure it works for durations that are not LCD'ed - example from LWG3091
  55     constexpr auto d = std::chrono::abs(std::chrono::duration<int, std::ratio<60, 100>>{2});
  56     static_assert(d.count() == 2, "");
  57     }
  58
  59   return 0;
  60 }