47 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 day;12 13// constexpr day& operator--() noexcept;14// constexpr day operator--(int) noexcept;15 16#include <chrono>17#include <cassert>18#include <type_traits>19#include <utility>20 21#include "test_macros.h"22 23using day = std::chrono::day;24 25constexpr bool test() {26 for (unsigned i = 10; i <= 20; ++i) {27 day d(i);28 assert(static_cast<unsigned>(--d) == i - 1);29 assert(static_cast<unsigned>(d--) == i - 1);30 assert(static_cast<unsigned>(d) == i - 2);31 }32 return true;33}34 35int main(int, char**) {36 ASSERT_NOEXCEPT(--(std::declval<day&>()));37 ASSERT_NOEXCEPT((std::declval<day&>())--);38 39 ASSERT_SAME_TYPE(day, decltype(std::declval<day&>()--));40 ASSERT_SAME_TYPE(day&, decltype(--std::declval<day&>()));41 42 test();43 static_assert(test());44 45 return 0;46}47