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 // <chrono>
12
13 // floor
14
15 // template <class ToDuration, class Clock, class Duration>
16 // time_point<Clock, ToDuration>
17 // floor(const time_point<Clock, Duration>& t);
18
19 #include <chrono>
20 #include <type_traits>
21 #include <cassert>
22
23 template <class FromDuration, class ToDuration>
24 void
test(const FromDuration & df,const ToDuration & d)25 test(const FromDuration& df, const ToDuration& d)
26 {
27 typedef std::chrono::system_clock Clock;
28 typedef std::chrono::time_point<Clock, FromDuration> FromTimePoint;
29 typedef std::chrono::time_point<Clock, ToDuration> ToTimePoint;
30 {
31 FromTimePoint f(df);
32 ToTimePoint t(d);
33 typedef decltype(std::chrono::floor<ToDuration>(f)) R;
34 static_assert((std::is_same<R, ToTimePoint>::value), "");
35 assert(std::chrono::floor<ToDuration>(f) == t);
36 }
37 }
38
39 template<class FromDuration, long long From, class ToDuration, long long To>
test_constexpr()40 void test_constexpr ()
41 {
42 typedef std::chrono::system_clock Clock;
43 typedef std::chrono::time_point<Clock, FromDuration> FromTimePoint;
44 typedef std::chrono::time_point<Clock, ToDuration> ToTimePoint;
45 {
46 constexpr FromTimePoint f{FromDuration{From}};
47 constexpr ToTimePoint t{ToDuration{To}};
48 static_assert(std::chrono::floor<ToDuration>(f) == t, "");
49 }
50 }
51
main()52 int main()
53 {
54 // 7290000ms is 2 hours, 1 minute, and 30 seconds
55 test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
56 test(std::chrono::milliseconds(-7290000), std::chrono::hours(-3));
57 test(std::chrono::milliseconds( 7290000), std::chrono::minutes( 121));
58 test(std::chrono::milliseconds(-7290000), std::chrono::minutes(-122));
59
60 // 9000000ms is 2 hours and 30 minutes
61 test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::hours, 2> ();
62 test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::hours, -3> ();
63 test_constexpr<std::chrono::milliseconds, 9000001, std::chrono::minutes, 150> ();
64 test_constexpr<std::chrono::milliseconds,-9000001, std::chrono::minutes,-151> ();
65
66 test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::seconds, 9000> ();
67 test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::seconds,-9000> ();
68 }
69