47 lines · 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-exception6//7//===----------------------------------------------------------------------===//8// UNSUPPORTED: c++03, c++11, c++14, c++179// <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 24int 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}47