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 year_month_weekday_last;
12
13// constexpr year_month_weekday_last& operator+=(const years& d) noexcept;
14// constexpr year_month_weekday_last& operator-=(const years& d) noexcept;
15
16#include <chrono>
17#include <cassert>
18#include <type_traits>
19#include <utility>
20
21#include "test_macros.h"
22
23using year = std::chrono::year;
24using month = std::chrono::month;
25using weekday = std::chrono::weekday;
26using weekday_last = std::chrono::weekday_last;
27using year_month_weekday_last = std::chrono::year_month_weekday_last;
28using years = std::chrono::years;
29
30constexpr bool test() {
31 constexpr weekday Tuesday = std::chrono::Tuesday;
32 constexpr month January = std::chrono::January;
33
34 for (int i = 1000; i <= 1010; ++i) {
35 year_month_weekday_last ymwd(year{i}, January, weekday_last{Tuesday});
36
37 assert(static_cast<int>((ymwd += years{2}).year()) == i + 2);
38 assert(ymwd.month() == January);
39 assert(ymwd.weekday() == Tuesday);
40
41 assert(static_cast<int>((ymwd).year()) == i + 2);
42 assert(ymwd.month() == January);
43 assert(ymwd.weekday() == Tuesday);
44
45 assert(static_cast<int>((ymwd -= years{1}).year()) == i + 1);
46 assert(ymwd.month() == January);
47 assert(ymwd.weekday() == Tuesday);
48
49 assert(static_cast<int>((ymwd).year()) == i + 1);
50 assert(ymwd.month() == January);
51 assert(ymwd.weekday() == Tuesday);
52 }
53
54 return true;
55}
56
57int main(int, char**) {
58 ASSERT_NOEXCEPT(std::declval<year_month_weekday_last&>() += std::declval<years>());
59 ASSERT_NOEXCEPT(std::declval<year_month_weekday_last&>() -= std::declval<years>());
60
61 ASSERT_SAME_TYPE(
62 year_month_weekday_last&, decltype(std::declval<year_month_weekday_last&>() += std::declval<years>()));
63 ASSERT_SAME_TYPE(
64 year_month_weekday_last&, decltype(std::declval<year_month_weekday_last&>() -= std::declval<years>()));
65
66 test();
67 static_assert(test());
68
69 return 0;
70}
71

source code of libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.members/plus_minus_equal_year.pass.cpp