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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: no-filesystem
// Filesystem is supported on Apple platforms starting with macosx10.15.
// UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
// <chrono>
//
// file_clock
//
// template<class Duration>
// static sys_time<see-below> to_sys(const file_time<Duration>&);
//
// template<class Duration>
// static file_time<see-below> from_sys(const sys_time<Duration>&);
#include <chrono>
#include <cassert>
int main(int, char**) {
// Test round-trip through the system clock, starting from file_clock::now()
{
std::chrono::file_clock::time_point const ft = std::chrono::file_clock::now();
auto st = std::chrono::file_clock::to_sys(ft);
assert(ft == std::chrono::file_clock::from_sys(st));
}
// Test round-trip through the system clock, starting from system_clock::now()
{
std::chrono::system_clock::time_point const st = std::chrono::system_clock::now();
auto ft = std::chrono::file_clock::from_sys(st);
assert(st == std::chrono::file_clock::to_sys(ft));
}
// Make sure the value we get is in the ballpark of something reasonable
{
std::chrono::file_clock::time_point const file_now = std::chrono::file_clock::now();
std::chrono::system_clock::time_point const sys_now = std::chrono::system_clock::now();
{
auto diff = sys_now - std::chrono::file_clock::to_sys(file_now);
assert(std::chrono::milliseconds(-500) < diff && diff < std::chrono::milliseconds(500));
}
{
auto diff = std::chrono::file_clock::from_sys(sys_now) - file_now;
assert(std::chrono::milliseconds(-500) < diff && diff < std::chrono::milliseconds(500));
}
}
// Make sure to_sys and from_sys are consistent with each other
{
std::chrono::file_clock::time_point const ft = std::chrono::file_clock::now();
std::chrono::system_clock::time_point const st = std::chrono::system_clock::now();
auto sys_diff = std::chrono::file_clock::to_sys(ft) - st;
auto file_diff = ft - std::chrono::file_clock::from_sys(st);
assert(sys_diff == file_diff);
}
return 0;
}
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