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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 10// <chrono>11// class month_weekday_last;12 13// constexpr bool ok() const noexcept;14//  Returns: m_.ok() && wdl_.ok().15 16#include <chrono>17#include <cassert>18#include <type_traits>19#include <utility>20 21#include "test_macros.h"22 23int main(int, char**)24{25    using month              = std::chrono::month;26    using weekday            = std::chrono::weekday;27    using weekday_last       = std::chrono::weekday_last;28    using month_weekday_last = std::chrono::month_weekday_last;29 30    constexpr month January            = std::chrono::January;31    constexpr weekday Tuesday          = std::chrono::Tuesday;32    constexpr weekday_last lastTuesday = weekday_last{Tuesday};33 34    ASSERT_NOEXCEPT(                std::declval<const month_weekday_last>().ok());35    ASSERT_SAME_TYPE(bool, decltype(std::declval<const month_weekday_last>().ok()));36 37    static_assert(!month_weekday_last{month{}, lastTuesday}.ok(),               ""); // Bad month38    static_assert(!month_weekday_last{January, weekday_last{weekday{12}}}.ok(), ""); // Bad month39    static_assert( month_weekday_last{January, lastTuesday}.ok(),               ""); // Both OK40 41    for (unsigned i = 0; i <= 50; ++i)42    {43        month_weekday_last mwdl{month{i}, lastTuesday};44        assert( mwdl.ok() == month{i}.ok());45    }46 47    for (unsigned i = 0; i <= 50; ++i)48    {49        month_weekday_last mwdl{January, weekday_last{weekday{i}}};50        assert( mwdl.ok() == weekday_last{weekday{i}}.ok());51    }52 53  return 0;54}55