83 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 year_month_day_last14// operator-(const year_month_day_last& ymdl, const months& dm) noexcept;15//16// Returns: ymdl + (-dm).17//18// constexpr year_month_day_last19// operator-(const year_month_day_last& ymdl, const years& dy) noexcept;20//21// Returns: ymdl + (-dy).22 23#include <chrono>24#include <cassert>25#include <type_traits>26#include <utility>27 28#include "test_macros.h"29 30using year = std::chrono::year;31using month = std::chrono::month;32using month_day_last = std::chrono::month_day_last;33using year_month_day_last = std::chrono::year_month_day_last;34using months = std::chrono::months;35using years = std::chrono::years;36 37constexpr bool test() {38 constexpr month December = std::chrono::December;39 40 { // year_month_day_last - years41 42 year_month_day_last ymdl{year{1234}, month_day_last{December}};43 for (int i = 0; i <= 10; ++i) {44 year_month_day_last ymdl1 = ymdl - years{i};45 assert(static_cast<int>(ymdl1.year()) == 1234 - i);46 assert(ymdl1.month() == December);47 }48 }49 50 { // year_month_day_last - months51 52 year_month_day_last ymdl{year{1234}, month_day_last{December}};53 for (unsigned i = 0; i <= 10; ++i) {54 year_month_day_last ymdl1 = ymdl - months{i};55 assert(static_cast<int>(ymdl1.year()) == 1234);56 assert(static_cast<unsigned>(ymdl1.month()) == 12U - i);57 }58 // Test the year wraps around.59 for (unsigned i = 12; i <= 15; ++i) {60 year_month_day_last ymdl1 = ymdl - months{i};61 assert(static_cast<int>(ymdl1.year()) == 1233);62 assert(static_cast<unsigned>(ymdl1.month()) == 12U - i + 12);63 }64 }65 66 return true;67}68 69int main(int, char**) {70 // year_month_day_last - years71 ASSERT_NOEXCEPT(std::declval<year_month_day_last>() - std::declval<years>());72 ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<years>()));73 74 // year_month_day_last - months75 ASSERT_NOEXCEPT(std::declval<year_month_day_last>() - std::declval<months>());76 ASSERT_SAME_TYPE(year_month_day_last, decltype(std::declval<year_month_day_last>() - std::declval<months>()));77 78 test();79 static_assert(test());80 81 return 0;82}83