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-exception
6//
7//===----------------------------------------------------------------------===//
8// UNSUPPORTED: c++03, c++11, c++14, c++17
9
10// <chrono>
11// class day;
12
13// constexpr day& operator+=(const days& d) noexcept;
14// constexpr day& operator-=(const days& d) 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;
24using days = std::chrono::days;
25
26constexpr bool test() {
27 for (unsigned i = 0; i <= 10; ++i) {
28 day d(i);
29 assert(static_cast<unsigned>(d += days{22}) == i + 22);
30 assert(static_cast<unsigned>(d) == i + 22);
31 assert(static_cast<unsigned>(d -= days{12}) == i + 10);
32 assert(static_cast<unsigned>(d) == i + 10);
33 }
34
35 return true;
36}
37
38int main(int, char**) {
39 ASSERT_NOEXCEPT(std::declval<day&>() += std::declval<days>());
40 ASSERT_NOEXCEPT(std::declval<day&>() -= std::declval<days>());
41
42 ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() += std::declval<days>()));
43 ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() -= std::declval<days>()));
44
45 test();
46 static_assert(test());
47
48 return 0;
49}
50

source code of libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.members/plus_minus_equal.pass.cpp