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 operator sys_days() const noexcept;
14// Returns: If ok() == true, returns a sys_days that represents the last weekday()
15// of year()/month(). Otherwise the returned value is unspecified.
16
17#include <chrono>
18#include <cassert>
19#include <type_traits>
20#include <utility>
21
22#include "test_macros.h"
23
24
25int main(int, char**)
26{
27 using year = std::chrono::year;
28 using month = std::chrono::month;
29 using year_month_weekday_last = std::chrono::year_month_weekday_last;
30 using sys_days = std::chrono::sys_days;
31 using days = std::chrono::days;
32 using weekday = std::chrono::weekday;
33 using weekday_last = std::chrono::weekday_last;
34
35 ASSERT_NOEXCEPT( static_cast<sys_days>(std::declval<const year_month_weekday_last>()));
36 ASSERT_SAME_TYPE(sys_days, decltype(static_cast<sys_days>(std::declval<const year_month_weekday_last>())));
37
38 constexpr month January = std::chrono::January;
39 constexpr weekday Tuesday = std::chrono::Tuesday;
40
41 { // Last Tuesday in Jan 1970 was the 27th
42 constexpr year_month_weekday_last ymwdl{year{1970}, January, weekday_last{Tuesday}};
43 constexpr sys_days sd{ymwdl};
44
45 static_assert(sd.time_since_epoch() == days{26}, "");
46 }
47
48 { // Last Tuesday in Jan 2000 was the 25th
49 constexpr year_month_weekday_last ymwdl{year{2000}, January, weekday_last{Tuesday}};
50 constexpr sys_days sd{ymwdl};
51
52 static_assert(sd.time_since_epoch() == days{10957+24}, "");
53 }
54
55 { // Last Tuesday in Jan 1940 was the 30th
56 constexpr year_month_weekday_last ymwdl{year{1940}, January, weekday_last{Tuesday}};
57 constexpr sys_days sd{ymwdl};
58
59 static_assert(sd.time_since_epoch() == days{-10958+29}, "");
60 }
61
62 { // Last Tuesday in Nov 1939 was the 28th
63 year_month_weekday_last ymdl{year{1939}, std::chrono::November, weekday_last{Tuesday}};
64 sys_days sd{ymdl};
65
66 assert(sd.time_since_epoch() == days{-(10957+35)});
67 }
68
69 return 0;
70}
71

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