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
10 // UNSUPPORTED: c++98, c++03, c++11, c++14
11
12 // <chrono>
13
14 // abs
15
16 // template <class Rep, class Period>
17 // constexpr duration<Rep, Period> abs(duration<Rep, Period> d)
18
19 #include <chrono>
20 #include <type_traits>
21 #include <cassert>
22
23 template <class Duration>
24 void
test(const Duration & f,const Duration & d)25 test(const Duration& f, const Duration& d)
26 {
27 {
28 typedef decltype(std::chrono::abs(f)) R;
29 static_assert((std::is_same<R, Duration>::value), "");
30 assert(std::chrono::abs(f) == d);
31 }
32 }
33
main()34 int main()
35 {
36 // 7290000ms is 2 hours, 1 minute, and 30 seconds
37 test(std::chrono::milliseconds( 7290000), std::chrono::milliseconds( 7290000));
38 test(std::chrono::milliseconds(-7290000), std::chrono::milliseconds( 7290000));
39 test(std::chrono::minutes( 122), std::chrono::minutes( 122));
40 test(std::chrono::minutes(-122), std::chrono::minutes( 122));
41 test(std::chrono::hours(0), std::chrono::hours(0));
42
43 {
44 // 9000000ms is 2 hours and 30 minutes
45 constexpr std::chrono::hours h1 = std::chrono::abs(std::chrono::hours(-3));
46 static_assert(h1.count() == 3, "");
47 constexpr std::chrono::hours h2 = std::chrono::abs(std::chrono::hours(3));
48 static_assert(h2.count() == 3, "");
49 }
50 }
51