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 12// <chrono> 13 14// abs 15 16// template <class Rep, class Period> 17// constexpr duration<Rep, Period> abs(duration<Rep, Period> d) 18 19#include <chrono> 20#include <type_traits> 21#include <cassert> 22 23template <class Duration> 24void 25test(const Duration& f, const Duration& d) 26{ 27 { 28 typedef decltype(std::chrono::abs(f)) R; 29 static_assert((std::is_same<R, Duration>::value), ""); 30 assert(std::chrono::abs(f) == d); 31 } 32} 33 34int main() 35{ 36// 7290000ms is 2 hours, 1 minute, and 30 seconds 37 test(std::chrono::milliseconds( 7290000), std::chrono::milliseconds( 7290000)); 38 test(std::chrono::milliseconds(-7290000), std::chrono::milliseconds( 7290000)); 39 test(std::chrono::minutes( 122), std::chrono::minutes( 122)); 40 test(std::chrono::minutes(-122), std::chrono::minutes( 122)); 41 test(std::chrono::hours(0), std::chrono::hours(0)); 42 43 { 44// 9000000ms is 2 hours and 30 minutes 45 constexpr std::chrono::hours h1 = std::chrono::abs(std::chrono::hours(-3)); 46 static_assert(h1.count() == 3, ""); 47 constexpr std::chrono::hours h2 = std::chrono::abs(std::chrono::hours(3)); 48 static_assert(h2.count() == 3, ""); 49 } 50} 51