// Copyright (C) 2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }

#include <chrono>
#include <testsuite_hooks.h>

void
test01()
{
  auto sys_now = std::chrono::system_clock::now();
  auto file_now = std::chrono::file_clock::now();
  auto d1 = std::chrono::file_clock::to_sys(file_now) - sys_now;
  VERIFY( d1 < std::chrono::seconds(1) );
  auto d2 = file_now - std::chrono::file_clock::from_sys(sys_now);
  VERIFY( d2 == d1 );
}

int
main()
{
  test01();
}
