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;
12
13 // constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const months& dm) noexcept;
14 // Returns: ymwd + (-dm).
15 //
16 // constexpr year_month_weekday operator-(const year_month_weekday& ymwd, const years& dy) noexcept;
17 // Returns: ymwd + (-dy).
18
19
20 #include <chrono>
21 #include <type_traits>
22 #include <cassert>
23
24 #include "test_macros.h"
25
26
testConstexprYears()27 constexpr bool testConstexprYears ()
28 {
29 std::chrono::year_month_weekday ym0{std::chrono::year{1234}, std::chrono::January, std::chrono::weekday_indexed{std::chrono::Tuesday, 1}};
30 std::chrono::year_month_weekday ym1 = ym0 - std::chrono::years{10};
31 return
32 ym1.year() == std::chrono::year{1234-10}
33 && ym1.month() == std::chrono::January
34 && ym1.weekday() == std::chrono::Tuesday
35 && ym1.index() == 1
36 ;
37 }
38
testConstexprMonths()39 constexpr bool testConstexprMonths ()
40 {
41 std::chrono::year_month_weekday ym0{std::chrono::year{1234}, std::chrono::November, std::chrono::weekday_indexed{std::chrono::Tuesday, 1}};
42 std::chrono::year_month_weekday ym1 = ym0 - std::chrono::months{6};
43 return
44 ym1.year() == std::chrono::year{1234}
45 && ym1.month() == std::chrono::May
46 && ym1.weekday() == std::chrono::Tuesday
47 && ym1.index() == 1
48 ;
49 }
50
51
main(int,char **)52 int main(int, char**)
53 {
54 using year = std::chrono::year;
55 using month = std::chrono::month;
56 using weekday = std::chrono::weekday;
57 using weekday_indexed = std::chrono::weekday_indexed;
58 using year_month_weekday = std::chrono::year_month_weekday;
59 using years = std::chrono::years;
60 using months = std::chrono::months;
61
62 constexpr month November = std::chrono::November;
63 constexpr weekday Tuesday = std::chrono::Tuesday;
64
65 { // year_month_weekday - years
66 ASSERT_NOEXCEPT( std::declval<year_month_weekday>() - std::declval<years>());
67 ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<years>()));
68
69 static_assert(testConstexprYears(), "");
70
71 year_month_weekday ym{year{1234}, November, weekday_indexed{Tuesday, 1}};
72 for (int i = 0; i <= 10; ++i)
73 {
74 year_month_weekday ym1 = ym - years{i};
75 assert(static_cast<int>(ym1.year()) == 1234 - i);
76 assert(ym1.month() == November);
77 assert(ym1.weekday() == Tuesday);
78 assert(ym1.index() == 1);
79 }
80 }
81
82 { // year_month_weekday - months
83 ASSERT_NOEXCEPT( std::declval<year_month_weekday>() - std::declval<months>());
84 ASSERT_SAME_TYPE(year_month_weekday, decltype(std::declval<year_month_weekday>() - std::declval<months>()));
85
86 static_assert(testConstexprMonths(), "");
87
88 year_month_weekday ym{year{1234}, November, weekday_indexed{Tuesday, 2}};
89 for (unsigned i = 1; i <= 10; ++i)
90 {
91 year_month_weekday ym1 = ym - months{i};
92 assert(ym1.year() == year{1234});
93 assert(ym1.month() == month{11-i});
94 assert(ym1.weekday() == Tuesday);
95 assert(ym1.index() == 2);
96 }
97 }
98
99 return 0;
100 }
101