61 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;12 13// constexpr year_month_day operator-(const year_month_day& ymd, const years& dy) noexcept;14// Returns: ymd + (-dy)15 16 17#include <chrono>18#include <cassert>19#include <type_traits>20#include <utility>21 22#include "test_macros.h"23 24constexpr bool test_constexpr ()25{26 std::chrono::year_month_day ym0{std::chrono::year{1234}, std::chrono::January, std::chrono::day{12}};27 std::chrono::year_month_day ym1 = ym0 - std::chrono::years{10};28 return29 ym1.year() == std::chrono::year{1234-10}30 && ym1.month() == std::chrono::January31 && ym1.day() == std::chrono::day{12}32 ;33}34 35int main(int, char**)36{37 using year = std::chrono::year;38 using month = std::chrono::month;39 using day = std::chrono::day;40 using year_month_day = std::chrono::year_month_day;41 using years = std::chrono::years;42 43 ASSERT_NOEXCEPT( std::declval<year_month_day>() - std::declval<years>());44 ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<year_month_day>() - std::declval<years>()));45 46 constexpr month January = std::chrono::January;47 48 static_assert(test_constexpr(), "");49 50 year_month_day ym{year{1234}, January, day{10}};51 for (int i = 0; i <= 10; ++i)52 {53 year_month_day ym1 = ym - years{i};54 assert(static_cast<int>(ym1.year()) == 1234 - i);55 assert(ym1.month() == January);56 assert(ym1.day() == day{10});57 }58 59 return 0;60}61