1 // Copyright (C) 2020-2021 Free Software Foundation, Inc. 2 // 3 // This file is part of the GNU ISO C++ Library. This library is free 4 // software; you can redistribute it and/or modify it under the 5 // terms of the GNU General Public License as published by the 6 // Free Software Foundation; either version 3, or (at your option) 7 // any later version. 8 9 // This library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU General Public License for more details. 13 14 // You should have received a copy of the GNU General Public License along 15 // with this library; see the file COPYING3. If not see 16 // <http://www.gnu.org/licenses/>. 17 18 // { dg-options "-std=gnu++2a" } 19 // { dg-do run { target c++2a } } 20 21 #include <chrono> 22 #include <testsuite_hooks.h> 23 24 void test01()25test01() 26 { 27 auto sys_now = std::chrono::system_clock::now(); 28 auto file_now = std::chrono::file_clock::now(); 29 auto d1 = std::chrono::file_clock::to_sys(file_now) - sys_now; 30 VERIFY( d1 < std::chrono::seconds(1) ); 31 auto d2 = file_now - std::chrono::file_clock::from_sys(sys_now); 32 VERIFY( d2 == d1 ); 33 } 34 35 int main()36main() 37 { 38 test01(); 39 } 40