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 // <chrono>
10
11 // duration
12
13 // template <class ToDuration, class Rep, class Period>
14 // constexpr
15 // ToDuration
16 // duration_cast(const 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 ToDuration, class FromDuration>
26 void
test(const FromDuration & f,const ToDuration & d)27 test(const FromDuration& f, const ToDuration& d)
28 {
29 {
30 typedef decltype(std::chrono::duration_cast<ToDuration>(f)) R;
31 static_assert((std::is_same<R, ToDuration>::value), "");
32 assert(std::chrono::duration_cast<ToDuration>(f) == d);
33 }
34 }
35
main(int,char **)36 int main(int, char**)
37 {
38 test(std::chrono::milliseconds(7265000), std::chrono::hours(2));
39 test(std::chrono::milliseconds(7265000), std::chrono::minutes(121));
40 test(std::chrono::milliseconds(7265000), std::chrono::seconds(7265));
41 test(std::chrono::milliseconds(7265000), std::chrono::milliseconds(7265000));
42 test(std::chrono::milliseconds(7265000), std::chrono::microseconds(7265000000LL));
43 test(std::chrono::milliseconds(7265000), std::chrono::nanoseconds(7265000000000LL));
44 test(std::chrono::milliseconds(7265000),
45 std::chrono::duration<double, std::ratio<3600> >(7265./3600));
46 test(std::chrono::duration<int, std::ratio<2, 3> >(9),
47 std::chrono::duration<int, std::ratio<3, 5> >(10));
48 #if TEST_STD_VER >= 11
49 {
50 constexpr std::chrono::hours h = std::chrono::duration_cast<std::chrono::hours>(std::chrono::milliseconds(7265000));
51 static_assert(h.count() == 2, "");
52 }
53 #endif
54
55 return 0;
56 }
57