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 year_month_day& ymd, const years& dy) noexcept;
14// Returns: ymd + (-dy)
15
16
17#include <chrono>
18#include <cassert>
19#include <type_traits>
20#include <utility>
21
22#include "test_macros.h"
23
24constexpr bool test_constexpr ()
25{
26 std::chrono::year_month_day ym0{std::chrono::year{1234}, std::chrono::January, std::chrono::day{12}};
27 std::chrono::year_month_day ym1 = ym0 - std::chrono::years{10};
28 return
29 ym1.year() == std::chrono::year{1234-10}
30 && ym1.month() == std::chrono::January
31 && ym1.day() == std::chrono::day{12}
32 ;
33}
34
35int 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 years = std::chrono::years;
42
43 ASSERT_NOEXCEPT( std::declval<year_month_day>() - std::declval<years>());
44 ASSERT_SAME_TYPE(year_month_day, decltype(std::declval<year_month_day>() - std::declval<years>()));
45
46 constexpr month January = std::chrono::January;
47
48 static_assert(test_constexpr(), "");
49
50 year_month_day ym{year{1234}, January, day{10}};
51 for (int i = 0; i <= 10; ++i)
52 {
53 year_month_day ym1 = ym - years{i};
54 assert(static_cast<int>(ym1.year()) == 1234 - i);
55 assert(ym1.month() == January);
56 assert(ym1.day() == day{10});
57 }
58
59 return 0;
60}
61

source code of libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/minus.pass.cpp