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_day;
12
13 // constexpr year_month_day& operator+=(const months& m) noexcept;
14 // constexpr year_month_day& operator-=(const months& m) noexcept;
15
16 #include <chrono>
17 #include <type_traits>
18 #include <cassert>
19
20 #include "test_macros.h"
21
22 template <typename D, typename Ds>
testConstexpr(D d1)23 constexpr bool testConstexpr(D d1)
24 {
25 if (static_cast<unsigned>((d1 ).month()) != 1) return false;
26 if (static_cast<unsigned>((d1 += Ds{ 1}).month()) != 2) return false;
27 if (static_cast<unsigned>((d1 += Ds{ 2}).month()) != 4) return false;
28 if (static_cast<unsigned>((d1 += Ds{12}).month()) != 4) return false;
29 if (static_cast<unsigned>((d1 -= Ds{ 1}).month()) != 3) return false;
30 if (static_cast<unsigned>((d1 -= Ds{ 2}).month()) != 1) return false;
31 if (static_cast<unsigned>((d1 -= Ds{12}).month()) != 1) return false;
32 return true;
33 }
34
main(int,char **)35 int main(int, char**)
36 {
37 using year = std::chrono::year;
38 using month = std::chrono::month;
39 using day = std::chrono::day;
40 using year_month_day = std::chrono::year_month_day;
41 using months = std::chrono::months;
42
43 ASSERT_NOEXCEPT(std::declval<year_month_day&>() += std::declval<months>());
44 ASSERT_NOEXCEPT(std::declval<year_month_day&>() -= std::declval<months>());
45
46 ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() += std::declval<months>()));
47 ASSERT_SAME_TYPE(year_month_day&, decltype(std::declval<year_month_day&>() -= std::declval<months>()));
48
49 static_assert(testConstexpr<year_month_day, months>(year_month_day{year{1234}, month{1}, day{1}}), "");
50
51 for (unsigned i = 0; i <= 10; ++i)
52 {
53 year y{1234};
54 day d{23};
55 year_month_day ym(y, month{i}, d);
56 assert(static_cast<unsigned>((ym += months{2}).month()) == i + 2);
57 assert(ym.year() == y);
58 assert(ym.day() == d);
59 assert(static_cast<unsigned>((ym ).month()) == i + 2);
60 assert(ym.year() == y);
61 assert(ym.day() == d);
62 assert(static_cast<unsigned>((ym -= months{1}).month()) == i + 1);
63 assert(ym.year() == y);
64 assert(ym.day() == d);
65 assert(static_cast<unsigned>((ym ).month()) == i + 1);
66 assert(ym.year() == y);
67 assert(ym.day() == d);
68 }
69
70 return 0;
71 }
72