/*
 *   surf - visualizing algebraic curves and algebraic surfaces
 *   Copyright (C) 1996-1997 Friedrich-Alexander-Universitaet
 *                           Erlangen-Nuernberg
 *                 1997-2000 Johannes Gutenberg-Universitaet Mainz
 *   Authors: Stephan Endrass, Hans Huelf, Ruediger Oertel,
 *            Kai Schneider, Ralf Schmitt, Johannes Beigel
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#ifndef REFCOUNTER_H
#define REFCOUNTER_H

#include <assert.h>
#include "debug.h"


class RefCounter
{
public:
	RefCounter()   {count=1;};
	virtual ~RefCounter()  {assert(count==0);}

	void release() {count--; if(count==0) delete this;};
	void retain()  {count++;};

protected:
	int count;
};

inline void release(RefCounter *rc)
{
	if (rc)
		rc->release();
}

inline void retain (RefCounter *rc)
{
	if (rc)
		rc->retain();
}

#endif
