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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+(const day& x, const days& y) noexcept;14//   Returns: day(unsigned{x} + y.count()).15//16// constexpr day operator+(const days& x, const day& y) noexcept;17//   Returns: y + x.18 19#include <chrono>20#include <cassert>21#include <type_traits>22#include <utility>23 24#include "test_macros.h"25 26using day  = std::chrono::day;27using days = std::chrono::days;28 29constexpr bool test() {30  day dy{12};31  for (unsigned i = 0; i <= 10; ++i) {32    day d1 = dy + days{i};33    day d2 = days{i} + dy;34    assert(d1 == d2);35    assert(static_cast<unsigned>(d1) == i + 12);36    assert(static_cast<unsigned>(d2) == i + 12);37  }38 39  return true;40}41 42int main(int, char**) {43  ASSERT_NOEXCEPT(std::declval<day>() + std::declval<days>());44  ASSERT_NOEXCEPT(std::declval<days>() + std::declval<day>());45 46  ASSERT_SAME_TYPE(day, decltype(std::declval<day>() + std::declval<days>()));47  ASSERT_SAME_TYPE(day, decltype(std::declval<days>() + std::declval<day>()));48 49  test();50  static_assert(test());51 52  return 0;53}54