64 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 10// <chrono>11// class year_month_day_last;12 13// constexpr operator sys_days() const noexcept;14// Returns: sys_days{year()/month()/day()}.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_day_last = std::chrono::month_day_last;27 using year_month_day_last = std::chrono::year_month_day_last;28 using sys_days = std::chrono::sys_days;29 using days = std::chrono::days;30 31 ASSERT_NOEXCEPT( static_cast<sys_days>(std::declval<const year_month_day_last>()));32 ASSERT_SAME_TYPE(sys_days, decltype(static_cast<sys_days>(std::declval<const year_month_day_last>())));33 34 { // Last day in Jan 1970 was the 31st35 constexpr year_month_day_last ymdl{year{1970}, month_day_last{std::chrono::January}};36 constexpr sys_days sd{ymdl};37 38 static_assert(sd.time_since_epoch() == days{30}, "");39 }40 41 {42 constexpr year_month_day_last ymdl{year{2000}, month_day_last{std::chrono::January}};43 constexpr sys_days sd{ymdl};44 45 static_assert(sd.time_since_epoch() == days{10957+30}, "");46 }47 48 {49 constexpr year_month_day_last ymdl{year{1940}, month_day_last{std::chrono::January}};50 constexpr sys_days sd{ymdl};51 52 static_assert(sd.time_since_epoch() == days{-10957+29}, "");53 }54 55 {56 year_month_day_last ymdl{year{1939}, month_day_last{std::chrono::November}};57 sys_days sd{ymdl};58 59 assert(sd.time_since_epoch() == days{-(10957+33)});60 }61 62 return 0;63}64