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 #include "test_macros.h" 24 25 template <class ToDuration, class FromDuration> 26 void 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 36 int main() 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
