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, c++17 10 // UNSUPPORTED: no-filesystem 11 12 // UNSUPPORTED: availability-filesystem-missing 13 14 // <chrono> 15 // 16 // file_clock 17 // 18 // template<class Duration> 19 // static sys_time<see-below> to_sys(const file_time<Duration>&); 20 // 21 // template<class Duration> 22 // static file_time<see-below> from_sys(const sys_time<Duration>&); 23 24 #include <chrono> 25 #include <cassert> 26 main(int,char **)27int main(int, char**) { 28 // Test round-trip through the system clock, starting from file_clock::now() 29 { 30 std::chrono::file_clock::time_point const ft = std::chrono::file_clock::now(); 31 auto st = std::chrono::file_clock::to_sys(ft); 32 assert(ft == std::chrono::file_clock::from_sys(st)); 33 } 34 35 // Test round-trip through the system clock, starting from system_clock::now() 36 { 37 std::chrono::system_clock::time_point const st = std::chrono::system_clock::now(); 38 auto ft = std::chrono::file_clock::from_sys(st); 39 assert(st == std::chrono::file_clock::to_sys(ft)); 40 } 41 42 // Make sure the value we get is in the ballpark of something reasonable 43 { 44 std::chrono::file_clock::time_point const file_now = std::chrono::file_clock::now(); 45 std::chrono::system_clock::time_point const sys_now = std::chrono::system_clock::now(); 46 { 47 auto diff = sys_now - std::chrono::file_clock::to_sys(file_now); 48 assert(std::chrono::milliseconds(-500) < diff && diff < std::chrono::milliseconds(500)); 49 } 50 { 51 auto diff = std::chrono::file_clock::from_sys(sys_now) - file_now; 52 assert(std::chrono::milliseconds(-500) < diff && diff < std::chrono::milliseconds(500)); 53 } 54 } 55 56 // Make sure to_sys and from_sys are consistent with each other 57 { 58 std::chrono::file_clock::time_point const ft = std::chrono::file_clock::now(); 59 std::chrono::system_clock::time_point const st = std::chrono::system_clock::now(); 60 auto sys_diff = std::chrono::file_clock::to_sys(ft) - st; 61 auto file_diff = ft - std::chrono::file_clock::from_sys(st); 62 assert(sys_diff == file_diff); 63 } 64 65 return 0; 66 } 67