85 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_weekday;12 13// constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const months& dm) noexcept;14// Returns: ymwd + (-dm).15//16// constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const years& dy) noexcept;17// Returns: ymwd + (-dy).18 19#include <chrono>20#include <cassert>21#include <type_traits>22#include <utility>23 24#include "test_macros.h"25 26using year = std::chrono::year;27using month = std::chrono::month;28using weekday = std::chrono::weekday;29using weekday_indexed = std::chrono::weekday_indexed;30using year_month_weekday = std::chrono::year_month_weekday;31using years = std::chrono::years;32using months = std::chrono::months;33 34constexpr bool test() {35 constexpr month November = std::chrono::November;36 constexpr weekday Tuesday = std::chrono::Tuesday;37 38 { // year_month_weekday - years39 year_month_weekday ymwd{year{1234}, November, weekday_indexed{Tuesday, 1}};40 for (int i = 0; i <= 10; ++i) {41 year_month_weekday ymwd1 = ymwd - years{i};42 assert(static_cast<int>(ymwd1.year()) == 1234 - i);43 assert(ymwd1.month() == November);44 assert(ymwd1.weekday() == Tuesday);45 assert(ymwd1.index() == 1);46 }47 }48 49 { // year_month_weekday - months50 year_month_weekday ymwd{year{1234}, November, weekday_indexed{Tuesday, 2}};51 for (unsigned i = 1; i <= 10; ++i) {52 year_month_weekday ymwd1 = ymwd - months{i};53 assert(ymwd1.year() == year{1234});54 assert(ymwd1.month() == month{11 - i});55 assert(ymwd1.weekday() == Tuesday);56 assert(ymwd1.index() == 2);57 }58 // Test the year wraps around.59 for (unsigned i = 12; i <= 15; ++i) {60 year_month_weekday ymwd1 = ymwd - months{i};61 assert(ymwd1.year() == year{1233});62 assert(ymwd1.month() == month{11 - i + 12});63 assert(ymwd1.weekday() == Tuesday);64 assert(ymwd1.index() == 2);65 }66 }67 68 return true;69}70 71int main(int, char**) {72 // year_month_weekday - years73 ASSERT_NOEXCEPT(std::declval<year_month_weekday>() - std::declval<years>());74 ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<years>()));75 76 // year_month_weekday - months77 ASSERT_NOEXCEPT(std::declval<year_month_weekday>() - std::declval<months>());78 ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<months>()));79 80 test();81 static_assert(test());82 83 return 0;84}85