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 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 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
