/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 Georgia Tech Research Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program 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 program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author:  George Riley <riley@ece.gatech.edu>

 * Adapted from original code in object.h by:

 * Authors: Gustavo Carneiro <gjcarneiro@gmail.com>,

 *          Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#ifndef __REF_COUNT_BASE_H__

#define __REF_COUNT_BASE_H__

#include <stdint.h>

namespace ns3 {

/**

 * \brief a base class that provides implementations of reference counting

 *    operations.

 *  

 * A base class that provides implementations of reference counting 

 * operations, for classes that wish to use the templatized smart 

 * pointer for memory management but that do not wish to derive from

 * class ns3::Object.

 *

 */

class RefCountBase 

{ 

public:

  RefCountBase();

  RefCountBase (const RefCountBase &o);

  RefCountBase &operator = (const RefCountBase &o);

  virtual ~RefCountBase ();

  /**

   * Increment the reference count. This method should not be called

   * by user code. RefCountBase instances are expected to be used in

   * conjunction with the Ptr template which would make calling Ref

   * unecessary and dangerous.

   */

  inline void Ref () const;

  /**

   * Decrement the reference count. This method should not be called

   * by user code. RefCountBase instances are expected to be used in 

   * conjunction with the Ptr template which would make calling Ref

   * unecessary and dangerous.

   */

  inline void Unref () const;

private:

  // Note we make this mutable so that the const methods can still

  // change it.

  mutable uint32_t m_count;  // Reference count

};

} // namespace ns3

namespace ns3 {

// Implementation of the in-line methods

void

RefCountBase::Ref () const

{

  m_count++;

}

void

RefCountBase::Unref () const

{

  if (--m_count == 0)

    { // All references removed, ok to delete

      delete this;

    }

}

} // namespace ns3

#endif /* __REF_COUNT_BASE_H__*/