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;
13
14 // constexpr year_month operator+(const year_month& ym, const years& dy) noexcept;
15 // Returns: (ym.year() + dy) / ym.month().
16 //
17 // constexpr year_month operator+(const years& dy, const year_month& ym) noexcept;
18 // Returns: ym + dy.
19 //
20 // constexpr year_month operator+(const year_month& ym, const months& dm) noexcept;
21 // Returns: A year_month value z such that z - ym == dm.
22 // Complexity: O(1) with respect to the value of dm.
23 //
24 // constexpr year_month operator+(const months& dm, const year_month& ym) noexcept;
25 // Returns: ym + dm.
26
27
28
29 #include <chrono>
30 #include <type_traits>
31 #include <cassert>
32
33 #include "test_macros.h"
34
testConstexprYears(std::chrono::year_month ym)35 constexpr bool testConstexprYears(std::chrono::year_month ym)
36 {
37 std::chrono::years offset{23};
38 if (static_cast<int>((ym ).year()) != 1) return false;
39 if (static_cast<int>((ym + offset).year()) != 24) return false;
40 if (static_cast<int>((offset + ym).year()) != 24) return false;
41 return true;
42 }
43
44
testConstexprMonths(std::chrono::year_month ym)45 constexpr bool testConstexprMonths(std::chrono::year_month ym)
46 {
47 std::chrono::months offset{6};
48 if (static_cast<unsigned>((ym ).month()) != 1) return false;
49 if (static_cast<unsigned>((ym + offset).month()) != 7) return false;
50 if (static_cast<unsigned>((offset + ym).month()) != 7) return false;
51 return true;
52 }
53
54
main()55 int main()
56 {
57 using year = std::chrono::year;
58 using years = std::chrono::years;
59 using month = std::chrono::month;
60 using months = std::chrono::months;
61 using year_month = std::chrono::year_month;
62
63 { // year_month + years
64 ASSERT_NOEXCEPT(std::declval<year_month>() + std::declval<years>());
65 ASSERT_NOEXCEPT(std::declval<years>() + std::declval<year_month>());
66
67 ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<years>()));
68 ASSERT_SAME_TYPE(year_month, decltype(std::declval<years>() + std::declval<year_month>()));
69
70 static_assert(testConstexprYears (year_month{year{1}, month{1}}), "");
71
72 year_month ym{year{1234}, std::chrono::January};
73 for (int i = 0; i <= 10; ++i)
74 {
75 year_month ym1 = ym + years{i};
76 year_month ym2 = years{i} + ym;
77 assert(static_cast<int>(ym1.year()) == i + 1234);
78 assert(static_cast<int>(ym2.year()) == i + 1234);
79 assert(ym1.month() == std::chrono::January);
80 assert(ym2.month() == std::chrono::January);
81 assert(ym1 == ym2);
82 }
83 }
84
85 { // year_month + months
86 ASSERT_NOEXCEPT(std::declval<year_month>() + std::declval<months>());
87 ASSERT_NOEXCEPT(std::declval<months>() + std::declval<year_month>());
88
89 ASSERT_SAME_TYPE(year_month, decltype(std::declval<year_month>() + std::declval<months>()));
90 ASSERT_SAME_TYPE(year_month, decltype(std::declval<months>() + std::declval<year_month>()));
91
92 static_assert(testConstexprMonths(year_month{year{1}, month{1}}), "");
93
94 year_month ym{year{1234}, std::chrono::January};
95 for (int i = 0; i <= 10; ++i) // TODO test wrap-around
96 {
97 year_month ym1 = ym + months{i};
98 year_month ym2 = months{i} + ym;
99 assert(static_cast<int>(ym1.year()) == 1234);
100 assert(static_cast<int>(ym2.year()) == 1234);
101 assert(ym1.month() == month(1 + i));
102 assert(ym2.month() == month(1 + i));
103 assert(ym1 == ym2);
104 }
105 }
106 }
107