message_tag.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2018 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, 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
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

// Local includes
#include "libmesh/message_tag.h"

#include "libmesh/communicator.h"



namespace libMesh
{

namespace Parallel
{

// ------------------------------------------------------------
// MessageTag member functions

MessageTag::~MessageTag()
{
  if (_comm)
    _comm->dereference_unique_tag(_tagvalue);
}


MessageTag::MessageTag(const MessageTag & other)
  : _tagvalue(other._tagvalue), _comm(other._comm)
{
  if (_comm)
    _comm->reference_unique_tag(_tagvalue);
}


MessageTag::MessageTag(MessageTag && other)
  : _tagvalue(other._tagvalue), _comm(other._comm)
{
  // I stole your tag reference!
  other._comm = nullptr;
}


MessageTag & MessageTag::operator= (const MessageTag & other)
{
  if (_comm)
    _comm->dereference_unique_tag(_tagvalue);

  _tagvalue = other._tagvalue;
  _comm = other._comm;

  if (_comm)
    _comm->reference_unique_tag(_tagvalue);

  return *this;
}


MessageTag & MessageTag::operator= (MessageTag && other)
{
  if (_comm)
    _comm->dereference_unique_tag(_tagvalue);

  _tagvalue = other._tagvalue;
  _comm = other._comm;

  // I stole your tag reference!
  other._comm = nullptr;

  return *this;
}


} // namespace Parallel

} // namespace libMesh