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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14 10 11 // <chrono> 12 13 // abs 14 15 // template <class Rep, class Period> 16 // constexpr duration<Rep, Period> abs(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 25 template <class Duration> 26 void 27 test(const Duration& f, const Duration& d) 28 { 29 { 30 typedef decltype(std::chrono::abs(f)) R; 31 static_assert((std::is_same<R, Duration>::value), ""); 32 assert(std::chrono::abs(f) == d); 33 } 34 } 35 36 int main(int, char**) 37 { 38 // 7290000ms is 2 hours, 1 minute, and 30 seconds 39 test(std::chrono::milliseconds( 7290000), std::chrono::milliseconds( 7290000)); 40 test(std::chrono::milliseconds(-7290000), std::chrono::milliseconds( 7290000)); 41 test(std::chrono::minutes( 122), std::chrono::minutes( 122)); 42 test(std::chrono::minutes(-122), std::chrono::minutes( 122)); 43 test(std::chrono::hours(0), std::chrono::hours(0)); 44 45 { 46 // 9000000ms is 2 hours and 30 minutes 47 constexpr std::chrono::hours h1 = std::chrono::abs(std::chrono::hours(-3)); 48 static_assert(h1.count() == 3, ""); 49 constexpr std::chrono::hours h2 = std::chrono::abs(std::chrono::hours(3)); 50 static_assert(h2.count() == 3, ""); 51 } 52 53 { 54 // Make sure it works for durations that are not LCD'ed - example from LWG3091 55 constexpr auto d = std::chrono::abs(std::chrono::duration<int, std::ratio<60, 100>>{2}); 56 static_assert(d.count() == 2, ""); 57 } 58 59 return 0; 60 } 61