/*
 *  This file if part of nzbget
 *
 *  Copyright (C) 2004  Sven Henkel <sidddy@users.sourceforge.net>
 *  Copyright (C) 2007-2014  Andrey Prygunkov <hugbug@users.sourceforge.net>
 *
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * $Revision: 967 $
 * $Date: 2014-03-20 17:14:39 -0400 (Thu, 20 Mar 2014) $
 *
 */


#ifndef OBSERVER_H
#define OBSERVER_H

#include <list>

class Observer;

class Subject
{
private:
	std::list<Observer*> 	m_Observers;

public:
					Subject();
	void 			Attach(Observer* pObserver);
	void 			Detach(Observer* pObserver);
	void 			Notify(void* pAspect);
};

class Observer
{
protected:
	virtual void	Update(Subject* pCaller, void* pAspect) = 0;
	friend class Subject;
};

#endif