xref: /llvm-project/libcxx/test/std/time/time.duration/time.duration.alg/abs.pass.cpp (revision 7738db2c06b177fe916ac1bcf3633449b3c1fca9)
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 
9 // UNSUPPORTED: c++03, c++11, c++14
10 
11 // <chrono>
12 
13 // abs
14 
15 // template <class Rep, class Period>
16 //   constexpr duration<Rep, Period> abs(duration<Rep, Period> d)
17 
18 #include <chrono>
19 #include <cassert>
20 #include <ratio>
21 #include <type_traits>
22 
23 #include "test_macros.h"
24 
25 template <class Duration>
26 void
test(const Duration & f,const Duration & d)27 test(const Duration& f, const Duration& d)
28 {
29     {
30     typedef decltype(std::chrono::abs(f)) R;
31     static_assert((std::is_same<R, Duration>::value), "");
32     assert(std::chrono::abs(f) == d);
33     }
34 }
35 
main(int,char **)36 int main(int, char**)
37 {
38 //  7290000ms is 2 hours, 1 minute, and 30 seconds
39     test(std::chrono::milliseconds( 7290000), std::chrono::milliseconds( 7290000));
40     test(std::chrono::milliseconds(-7290000), std::chrono::milliseconds( 7290000));
41     test(std::chrono::minutes( 122), std::chrono::minutes( 122));
42     test(std::chrono::minutes(-122), std::chrono::minutes( 122));
43     test(std::chrono::hours(0), std::chrono::hours(0));
44 
45     {
46 //  9000000ms is 2 hours and 30 minutes
47     constexpr std::chrono::hours h1 = std::chrono::abs(std::chrono::hours(-3));
48     static_assert(h1.count() == 3, "");
49     constexpr std::chrono::hours h2 = std::chrono::abs(std::chrono::hours(3));
50     static_assert(h2.count() == 3, "");
51     }
52 
53     {
54 //  Make sure it works for durations that are not LCD'ed - example from LWG3091
55     constexpr auto d = std::chrono::abs(std::chrono::duration<int, std::ratio<60, 100>>{2});
56     static_assert(d.count() == 2, "");
57     }
58 
59   return 0;
60 }
61