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/**
* Copyright (C) 2005 Savoir-Faire Linux inc.
* Author: Yan Morin <yan.morin@savoirfairelinux.com>
*
* 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 __PATTERN_OBSERVER_H_
#define __PATTERN_OBSERVER_H_
#include <list>
/**
* Observer design pattern interface
*/
namespace Pattern {
class Observer {
public:
virtual ~Observer() {};
virtual void update() = 0;
};
class Subject {
public:
virtual ~Subject() {};
void attach(Observer& observer);
void detach(Observer& observer);
void notify();
private:
std::list<Observer*> _observers;
};
} // end namespace
#endif // __PATTERN_OBSERVER_H_