63 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 month;12 13// constexpr month& operator+=(const month& d) noexcept;14// constexpr month& operator-=(const month& d) noexcept;15 16#include <chrono>17#include <cassert>18#include <type_traits>19#include <utility>20 21#include "test_macros.h"22 23constexpr bool test() {24 using month = std::chrono::month;25 using months = std::chrono::months;26 27 for (unsigned i = 1; i <= 10; ++i) {28 month m(i);29 int exp = i + 10;30 while (exp > 12)31 exp -= 12;32 assert(static_cast<unsigned>(m += months{10}) == static_cast<unsigned>(exp));33 assert(static_cast<unsigned>(m) == static_cast<unsigned>(exp));34 assert(m.ok());35 }36 37 for (unsigned i = 1; i <= 10; ++i) {38 month m(i);39 int exp = i - 9;40 while (exp < 1)41 exp += 12;42 assert(static_cast<unsigned>(m -= months{9}) == static_cast<unsigned>(exp));43 assert(static_cast<unsigned>(m) == static_cast<unsigned>(exp));44 assert(m.ok());45 }46 return true;47}48 49int main(int, char**) {50 using month = std::chrono::month;51 using months = std::chrono::months;52 53 ASSERT_NOEXCEPT(std::declval<month&>() += std::declval<months&>());54 ASSERT_NOEXCEPT(std::declval<month&>() -= std::declval<months&>());55 ASSERT_SAME_TYPE(month&, decltype(std::declval<month&>() += std::declval<months&>()));56 ASSERT_SAME_TYPE(month&, decltype(std::declval<month&>() -= std::declval<months&>()));57 58 test();59 static_assert(test());60 61 return 0;62}63