duration_cast.pass.cpp revision 473f838128bcf118ab50d08a65a83433ed1b015a 
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
23template <class ToDuration, class FromDuration>
24void
25test(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
34int 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