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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;12 13//  constexpr year_month_weekday(const sys_days& dp) noexcept;14//15//  Effects:  Constructs an object of type year_month_weekday that corresponds16//                to the date represented by dp17//18//  Remarks: For any value ymd of type year_month_weekday for which ymd.ok() is true,19//                ymd == year_month_weekday{sys_days{ymd}} is true.20//21//  constexpr chrono::year   year() const noexcept;22//  constexpr chrono::month month() const noexcept;23//  constexpr bool             ok() const noexcept;24 25#include <chrono>26#include <cassert>27#include <type_traits>28#include <utility>29 30#include "test_macros.h"31 32int main(int, char**)33{34    using year               = std::chrono::year;35    using days               = std::chrono::days;36    using sys_days           = std::chrono::sys_days;37    using weekday_indexed    = std::chrono::weekday_indexed;38    using year_month_weekday = std::chrono::year_month_weekday;39 40    ASSERT_NOEXCEPT(year_month_weekday{std::declval<const sys_days>()});41 42    {43    constexpr sys_days sd{}; // 1-Jan-1970 was a Thursday44    constexpr year_month_weekday ymwd{sd};45 46    static_assert( ymwd.ok(),                                                            "");47    static_assert( ymwd.year()            == year{1970},                                 "");48    static_assert( ymwd.month()           == std::chrono::January,                       "");49    static_assert( ymwd.weekday()         == std::chrono::Thursday,                      "");50    static_assert( ymwd.index()           == 1,                                          "");51    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Thursday, 1},  "");52    static_assert( ymwd                   == year_month_weekday{sys_days{ymwd}},         ""); // round trip53    }54 55    {56    constexpr sys_days sd{days{10957+32}}; // 2-Feb-2000 was a Wednesday57    constexpr year_month_weekday ymwd{sd};58 59    static_assert( ymwd.ok(),                                                            "");60    static_assert( ymwd.year()            == year{2000},                                 "");61    static_assert( ymwd.month()           == std::chrono::February,                      "");62    static_assert( ymwd.weekday()         == std::chrono::Wednesday,                     "");63    static_assert( ymwd.index()           == 1,                                          "");64    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Wednesday, 1}, "");65    static_assert( ymwd                   == year_month_weekday{sys_days{ymwd}},         ""); // round trip66    }67 68 69    {70    constexpr sys_days sd{days{-10957}}; // 2-Jan-1940 was a Tuesday71    constexpr year_month_weekday ymwd{sd};72 73    static_assert( ymwd.ok(),                                                            "");74    static_assert( ymwd.year()            == year{1940},                                 "");75    static_assert( ymwd.month()           == std::chrono::January,                       "");76    static_assert( ymwd.weekday()         == std::chrono::Tuesday,                       "");77    static_assert( ymwd.index()           == 1,                                          "");78    static_assert( ymwd.weekday_indexed() == weekday_indexed{std::chrono::Tuesday, 1},   "");79    static_assert( ymwd                   == year_month_weekday{sys_days{ymwd}},         ""); // round trip80    }81 82    {83    sys_days sd{days{-(10957+34)}}; // 29-Nov-1939 was a Wednesday84    year_month_weekday ymwd{sd};85 86    assert( ymwd.ok());87    assert( ymwd.year()            == year{1939});88    assert( ymwd.month()           == std::chrono::November);89    assert( ymwd.weekday()         == std::chrono::Wednesday);90    assert( ymwd.index()           == 5);91    assert((ymwd.weekday_indexed() == weekday_indexed{std::chrono::Wednesday, 5}));92    assert( ymwd                   == year_month_weekday{sys_days{ymwd}}); // round trip93    }94 95  return 0;96}97