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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_weekday_last;12 13// constexpr operator sys_days() const noexcept;14//  Returns: If ok() == true, returns a sys_days that represents the last weekday()15//             of year()/month(). Otherwise the returned value is unspecified.16 17#include <chrono>18#include <cassert>19#include <type_traits>20#include <utility>21 22#include "test_macros.h"23 24 25int main(int, char**)26{27    using year                    = std::chrono::year;28    using month                   = std::chrono::month;29    using year_month_weekday_last = std::chrono::year_month_weekday_last;30    using sys_days                = std::chrono::sys_days;31    using days                    = std::chrono::days;32    using weekday                 = std::chrono::weekday;33    using weekday_last            = std::chrono::weekday_last;34 35    ASSERT_NOEXCEPT(                    static_cast<sys_days>(std::declval<const year_month_weekday_last>()));36    ASSERT_SAME_TYPE(sys_days, decltype(static_cast<sys_days>(std::declval<const year_month_weekday_last>())));37 38    constexpr month   January = std::chrono::January;39    constexpr weekday Tuesday = std::chrono::Tuesday;40 41    { // Last Tuesday in Jan 1970 was the 27th42    constexpr year_month_weekday_last ymwdl{year{1970}, January, weekday_last{Tuesday}};43    constexpr sys_days sd{ymwdl};44 45    static_assert(sd.time_since_epoch() == days{26}, "");46    }47 48    { // Last Tuesday in Jan 2000 was the 25th49    constexpr year_month_weekday_last ymwdl{year{2000}, January, weekday_last{Tuesday}};50    constexpr sys_days sd{ymwdl};51 52    static_assert(sd.time_since_epoch() == days{10957+24}, "");53    }54 55    { // Last Tuesday in Jan 1940 was the 30th56    constexpr year_month_weekday_last ymwdl{year{1940}, January, weekday_last{Tuesday}};57    constexpr sys_days sd{ymwdl};58 59    static_assert(sd.time_since_epoch() == days{-10958+29}, "");60    }61 62    { // Last Tuesday in Nov 1939 was the 28th63    year_month_weekday_last ymdl{year{1939}, std::chrono::November, weekday_last{Tuesday}};64    sys_days sd{ymdl};65 66    assert(sd.time_since_epoch() == days{-(10957+35)});67    }68 69  return 0;70}71