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observer.h

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    observer.h 1.29 KiB
    /*
     *  Copyright (C) 2005-2006 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 3 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 {
    
    /**
     * Observer interface
     */
    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_