libcxx/test/std/time/time.hms/time.12/make12.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 make12(const hours& h) noexcept;
  12 //   Returns: The 12-hour equivalent of h in the range [1h, 12h].
  13 //     If h is not in the range [0h, 23h], the value returned is unspecified.
  14
  15 #include <chrono>
  16 #include <cassert>
  17 #include <utility>
  18
  19 #include "test_macros.h"
  20
  21 int main(int, char**)
  22 {
  23     using hours = std::chrono::hours;
  24     ASSERT_SAME_TYPE(hours, decltype(std::chrono::make12(std::declval<hours>())));
  25     ASSERT_NOEXCEPT(                 std::chrono::make12(std::declval<hours>()));
  26
  27     static_assert( std::chrono::make12(hours( 0)) == hours(12), "");
  28     static_assert( std::chrono::make12(hours(11)) == hours(11), "");
  29     static_assert( std::chrono::make12(hours(12)) == hours(12), "");
  30     static_assert( std::chrono::make12(hours(23)) == hours(11), "");
  31
  32     assert( std::chrono::make12(hours(0)) == hours(12));
  33     for (int i = 1; i < 13; ++i)
  34         assert( std::chrono::make12(hours(i)) == hours(i));
  35     for (int i = 13; i < 24; ++i)
  36         assert( std::chrono::make12(hours(i)) == hours(i-12));
  37
  38     return 0;
  39 }