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 // <chrono>
10
11 // constexpr hours make24(const hours& h, bool is_pm) noexcept;
12 // Returns: If is_pm is false, returns the 24-hour equivalent of h in the range [0h, 11h],
13 // assuming h represents an ante meridiem hour.
14 // Else returns the 24-hour equivalent of h in the range [12h, 23h],
15 // assuming h represents a post meridiem hour.
16 // If h is not in the range [1h, 12h], the value returned is unspecified.
17
18 #include <chrono>
19 #include <cassert>
20 #include <utility>
21
22 #include "test_macros.h"
23
main(int,char **)24 int main(int, char**)
25 {
26 using hours = std::chrono::hours;
27 ASSERT_SAME_TYPE(hours, decltype(std::chrono::make24(std::declval<hours>(), false)));
28 ASSERT_NOEXCEPT( std::chrono::make24(std::declval<hours>(), false));
29
30 static_assert( std::chrono::make24(hours( 1), false) == hours( 1), "");
31 static_assert( std::chrono::make24(hours(11), false) == hours(11), "");
32 static_assert( std::chrono::make24(hours(12), false) == hours( 0), "");
33 static_assert( std::chrono::make24(hours( 1), true) == hours(13), "");
34 static_assert( std::chrono::make24(hours(11), true) == hours(23), "");
35 static_assert( std::chrono::make24(hours(12), true) == hours(12), "");
36
37 for (int i = 1; i < 11; ++i)
38 {
39 assert((std::chrono::make24(hours(i), false)) == hours(i));
40 assert((std::chrono::make24(hours(i), true)) == hours(12+i));
41 }
42 assert((std::chrono::make24(hours(12), false)) == hours( 0));
43 assert((std::chrono::make24(hours(12), true)) == hours(12));
44
45 return 0;
46 }
47