//  $Id: refcounter.hpp 1195 2006-01-07 10:37:52Z grumbel $
// 
//  Windstille - A Jump'n Shoot Game
//  Copyright (C) 2005 Matthias Braun <matze@braunis.de>
//
//  This program 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 2
//  of the License, or (at your option) any later version.
//
//  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.

#ifndef __REFCOUNTER_HPP__
#define __REFCOUNTER_HPP__

#include <assert.h>

/**
 * A base class that provides reference counting facilities
 */
class RefCounter
{
public:
  RefCounter()
    : refcount(0)
  { }

  /** increases reference count */
  void ref()
  {
    refcount++;
  }
  /** decreases reference count. Destroys the object if the reference count
   * reaches 0
   */
  void unref()
  {
    refcount--;
    if(refcount <= 0) {
      delete this;
      return;
    }
  }

protected:
  virtual ~RefCounter()
  {
    assert(refcount == 0);
  }

private:
  int refcount;
};

#endif

/* EOF */