libcxx/test/std/time/time.duration/time.duration.cast/duration_cast.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 // <chrono>
  10
  11 // duration
  12
  13 // template <class ToDuration, class Rep, class Period>
  14 //   constexpr
  15 //   ToDuration
  16 //   duration_cast(const 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 ToDuration, class FromDuration>
  26 void
  27 test(const FromDuration& f, const ToDuration& d)
  28 {
  29     {
  30     typedef decltype(std::chrono::duration_cast<ToDuration>(f)) R;
  31     static_assert((std::is_same<R, ToDuration>::value), "");
  32     assert(std::chrono::duration_cast<ToDuration>(f) == d);
  33     }
  34 }
  35
  36 int main(int, char**)
  37 {
  38     test(std::chrono::milliseconds(7265000), std::chrono::hours(2));
  39     test(std::chrono::milliseconds(7265000), std::chrono::minutes(121));
  40     test(std::chrono::milliseconds(7265000), std::chrono::seconds(7265));
  41     test(std::chrono::milliseconds(7265000), std::chrono::milliseconds(7265000));
  42     test(std::chrono::milliseconds(7265000), std::chrono::microseconds(7265000000LL));
  43     test(std::chrono::milliseconds(7265000), std::chrono::nanoseconds(7265000000000LL));
  44     test(std::chrono::milliseconds(7265000),
  45          std::chrono::duration<double, std::ratio<3600> >(7265./3600));
  46     test(std::chrono::duration<int, std::ratio<2, 3> >(9),
  47          std::chrono::duration<int, std::ratio<3, 5> >(10));
  48 #if TEST_STD_VER >= 11
  49     {
  50     constexpr std::chrono::hours h = std::chrono::duration_cast<std::chrono::hours>(std::chrono::milliseconds(7265000));
  51     static_assert(h.count() == 2, "");
  52     }
  53 #endif
  54
  55   return 0;
  56 }