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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