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 23 template <class Duration> 24 void 25 test(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 34 int 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
