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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / experimental / memory / shared_ptr / observers / use_count.cc

// { dg-do run { target c++14 } }

// Copyright (C) 2015-2019 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/>.

// 8.2.1 Class template shared_ptr [memory.smartptr.shared]

#include <experimental/memory>
#include <testsuite_hooks.h>

struct A { };

// 8.2.1.2 shared_ptr observers [memory.smartptr.shared.obs]

// use_count
void
test01()
{
  const std::experimental::shared_ptr<A[5]> p1;
  VERIFY( p1.use_count() == 0 );
  const std::experimental::shared_ptr<A[5]> p2(p1);
  VERIFY( p1.use_count() == 0 );
}

void
test02()
{
  std::experimental::shared_ptr<A[5]> p1(new A[5]);
  std::experimental::shared_ptr<A[5]> p2(p1);
  p1.reset();
  VERIFY( p1.use_count() == 0 );
  VERIFY( p2.use_count() == 1 );
}

void
test03()
{
  std::experimental::shared_ptr<A[5]> p1(new A[5]);
  std::experimental::shared_ptr<A[5]> p2(p1);
  p2.reset(new A[5]);
  VERIFY( p1.use_count() == 1 );
  VERIFY( p2.use_count() == 1 );
}

int
main()
{
  test01();
  test02();
  test03();
  return 0;
}