libcxx/test/std/time/time.hms/time.12/make24.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 // UNSUPPORTED: c++03, c++11, c++14, c++17
   9 // <chrono>
  10
  11 // constexpr hours make24(const hours& h, bool is_pm) noexcept;
  12 //   Returns: If is_pm is false, returns the 24-hour equivalent of h in the range [0h, 11h],
  13 //       assuming h represents an ante meridiem hour.
  14 //     Else returns the 24-hour equivalent of h in the range [12h, 23h],
  15 //       assuming h represents a post meridiem hour.
  16 //     If h is not in the range [1h, 12h], the value returned is unspecified.
  17
  18 #include <chrono>
  19 #include <cassert>
  20 #include <utility>
  21
  22 #include "test_macros.h"
  23
  24 int main(int, char**)
  25 {
  26     using hours = std::chrono::hours;
  27     ASSERT_SAME_TYPE(hours, decltype(std::chrono::make24(std::declval<hours>(), false)));
  28     ASSERT_NOEXCEPT(                 std::chrono::make24(std::declval<hours>(), false));
  29
  30     static_assert( std::chrono::make24(hours( 1), false) == hours( 1), "");
  31     static_assert( std::chrono::make24(hours(11), false) == hours(11), "");
  32     static_assert( std::chrono::make24(hours(12), false) == hours( 0), "");
  33     static_assert( std::chrono::make24(hours( 1), true)  == hours(13), "");
  34     static_assert( std::chrono::make24(hours(11), true)  == hours(23), "");
  35     static_assert( std::chrono::make24(hours(12), true)  == hours(12), "");
  36
  37     for (int i = 1; i < 11; ++i)
  38     {
  39         assert((std::chrono::make24(hours(i), false)) == hours(i));
  40         assert((std::chrono::make24(hours(i), true))  == hours(12+i));
  41     }
  42     assert((std::chrono::make24(hours(12), false)) == hours( 0));
  43     assert((std::chrono::make24(hours(12), true))  == hours(12));
  44
  45     return 0;
  46 }