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 // <chrono>
11 
12 // duration
13 
14 // template <class ToDuration, class Rep, class Period>
15 //   constexpr
16 //   ToDuration
17 //   duration_cast(const duration<Rep, Period>& d);
18 
19 #include <chrono>
20 #include <type_traits>
21 #include <cassert>
22 
23 template <class ToDuration, class FromDuration>
24 void
test(const FromDuration & f,const ToDuration & d)25 test(const FromDuration& f, const ToDuration& d)
26 {
27     {
28     typedef decltype(std::chrono::duration_cast<ToDuration>(f)) R;
29     static_assert((std::is_same<R, ToDuration>::value), "");
30     assert(std::chrono::duration_cast<ToDuration>(f) == d);
31     }
32 }
33 
main()34 int main()
35 {
36     test(std::chrono::milliseconds(7265000), std::chrono::hours(2));
37     test(std::chrono::milliseconds(7265000), std::chrono::minutes(121));
38     test(std::chrono::milliseconds(7265000), std::chrono::seconds(7265));
39     test(std::chrono::milliseconds(7265000), std::chrono::milliseconds(7265000));
40     test(std::chrono::milliseconds(7265000), std::chrono::microseconds(7265000000LL));
41     test(std::chrono::milliseconds(7265000), std::chrono::nanoseconds(7265000000000LL));
42     test(std::chrono::milliseconds(7265000),
43          std::chrono::duration<double, std::ratio<3600> >(7265./3600));
44     test(std::chrono::duration<int, std::ratio<2, 3> >(9),
45          std::chrono::duration<int, std::ratio<3, 5> >(10));
46 #ifndef _LIBCPP_HAS_NO_CONSTEXPR
47     {
48     constexpr std::chrono::hours h = std::chrono::duration_cast<std::chrono::hours>(std::chrono::milliseconds(7265000));
49     static_assert(h.count() == 2, "");
50     }
51 #endif
52 }
53