1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
10
11 // <chrono>
12 // class year_month_weekday_last;
13
14 // constexpr year_month_weekday_last operator-(const year_month_weekday_last& ymwdl, const months& dm) noexcept;
15 // Returns: ymwdl + (-dm).
16 //
17 // constexpr year_month_weekday_last operator-(const year_month_weekday_last& ymwdl, const years& dy) noexcept;
18 // Returns: ymwdl + (-dy).
19
20 #include <chrono>
21 #include <type_traits>
22 #include <cassert>
23
24 #include "test_macros.h"
25
26 #include <iostream>
27
testConstexprYears(std::chrono::year_month_weekday_last ym)28 constexpr bool testConstexprYears(std::chrono::year_month_weekday_last ym)
29 {
30 std::chrono::years offset{14};
31 if (static_cast<int>((ym ).year()) != 66) return false;
32 if (static_cast<int>((ym - offset).year()) != 52) return false;
33 return true;
34 }
35
testConstexprMonths(std::chrono::year_month_weekday_last ym)36 constexpr bool testConstexprMonths(std::chrono::year_month_weekday_last ym)
37 {
38 std::chrono::months offset{6};
39 if (static_cast<unsigned>((ym ).month()) != 10) return false;
40 if (static_cast<unsigned>((ym - offset).month()) != 4) return false;
41 return true;
42 }
43
main()44 int main()
45 {
46 using year = std::chrono::year;
47 using month = std::chrono::month;
48 using weekday = std::chrono::weekday;
49 using weekday_last = std::chrono::weekday_last;
50 using year_month_weekday_last = std::chrono::year_month_weekday_last;
51 using years = std::chrono::years;
52 using months = std::chrono::months;
53
54 constexpr month October = std::chrono::October;
55 constexpr weekday Tuesday = std::chrono::Tuesday;
56
57 { // year_month_weekday_last - years
58
59 ASSERT_NOEXCEPT( std::declval<year_month_weekday_last>() - std::declval<years>());
60 ASSERT_SAME_TYPE(year_month_weekday_last, decltype(std::declval<year_month_weekday_last>() - std::declval<years>()));
61
62 static_assert(testConstexprYears(year_month_weekday_last{year{66}, October, weekday_last{Tuesday}}), "");
63
64 year_month_weekday_last ym{year{1234}, October, weekday_last{Tuesday}};
65 for (int i = 0; i <= 10; ++i)
66 {
67 year_month_weekday_last ym1 = ym - years{i};
68 assert(ym1.year() == year{1234 - i});
69 assert(ym1.month() == October);
70 assert(ym1.weekday() == Tuesday);
71 assert(ym1.weekday_last() == weekday_last{Tuesday});
72 }
73 }
74
75 { // year_month_weekday_last - months
76
77 ASSERT_NOEXCEPT( std::declval<year_month_weekday_last>() - std::declval<months>());
78 ASSERT_SAME_TYPE(year_month_weekday_last, decltype(std::declval<year_month_weekday_last>() - std::declval<months>()));
79
80 static_assert(testConstexprMonths(year_month_weekday_last{year{66}, October, weekday_last{Tuesday}}), "");
81
82 year_month_weekday_last ym{year{1234}, October, weekday_last{Tuesday}};
83 for (unsigned i = 0; i < 10; ++i)
84 {
85 year_month_weekday_last ym1 = ym - months{i};
86 assert(ym1.year() == year{1234});
87 assert(ym1.month() == month{10 - i});
88 assert(ym1.weekday() == Tuesday);
89 assert(ym1.weekday_last() == weekday_last{Tuesday});
90 }
91 }
92
93 }
94