// { dg-do run }
// { dg-additional-options "-pthread" { target pthread } }
// { dg-require-effective-target c++11 }
// { dg-require-gthreads "" }

// Copyright (C) 2009-2023 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/>.


#include <future>
#include <testsuite_hooks.h>

int value = 99;

void test01()
{
  std::promise<int> p1;
  const std::shared_future<int> f1(p1.get_future());
  std::shared_future<int> f2(f1);

  p1.set_value(value);
  VERIFY( f1.get() == value );
  VERIFY( f2.get() == value );
}

void test02()
{
  std::promise<int&> p1;
  const std::shared_future<int&> f1(p1.get_future());
  std::shared_future<int&> f2(f1);

  p1.set_value(value);
  VERIFY( &f1.get() == &value );
  VERIFY( &f2.get() == &value );
}

void test03()
{
  std::promise<void> p1;
  const std::shared_future<void> f1(p1.get_future());
  std::shared_future<void> f2(f1);

  p1.set_value();
  f1.get();
  f2.get();
}

int main()
{
  test01();
  test02();
  test03();

  return 0;
}