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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 year_month_day_last;12 13// constexpr bool ok() const noexcept;14//  Returns: m_.ok() && y_.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 year                = std::chrono::year;26    using month               = std::chrono::month;27    using month_day_last      = std::chrono::month_day_last;28    using year_month_day_last = std::chrono::year_month_day_last;29 30    constexpr month January = std::chrono::January;31 32    ASSERT_NOEXCEPT(                std::declval<const year_month_day_last>().ok());33    ASSERT_SAME_TYPE(bool, decltype(std::declval<const year_month_day_last>().ok()));34 35    static_assert(!year_month_day_last{year{-32768}, month_day_last{month{}}}.ok(), ""); // both bad36    static_assert(!year_month_day_last{year{-32768}, month_day_last{January}}.ok(), ""); // Bad year37    static_assert(!year_month_day_last{year{2019},   month_day_last{month{}}}.ok(), ""); // Bad month38    static_assert( year_month_day_last{year{2019},   month_day_last{January}}.ok(), ""); // All OK39 40    for (unsigned i = 0; i <= 50; ++i)41    {42        year_month_day_last ym{year{2019}, month_day_last{month{i}}};43        assert( ym.ok() == month{i}.ok());44    }45 46    const int ymax = static_cast<int>(year::max());47    for (int i = ymax - 100; i <= ymax + 100; ++i)48    {49        year_month_day_last ym{year{i}, month_day_last{January}};50        assert( ym.ok() == year{i}.ok());51    }52 53  return 0;54}55