57 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <chrono>10 11// duration12 13// template <class ToDuration, class Rep, class Period>14// constexpr15// ToDuration16// 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 25template <class ToDuration, class FromDuration>26void27test(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 36int 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 >= 1149 {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#endif54 55 return 0;56}57