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observer.cpp

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    observer.cpp 1.46 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.
     */
    
    #include "observer.h"
    #include <algorithm>
    namespace Pattern {
    
    void 
    Subject::attach(Observer& observer) 
    {
      if (std::find(_observers.begin(), _observers.end(), &observer) == _observers.end()) {
        _observers.push_back(&observer);
      } 
    }
    
    void 
    Subject::detach(Observer& observer) 
    {
      std::list<Observer*>::iterator iter = std::find(_observers.begin(), _observers.end(), &observer);
      if ( iter != _observers.end()) {
        _observers.erase(iter);
      } 
    }
    
    void 
    Subject::notify()
    {
      std::list<Observer*>::iterator iter = _observers.begin();
      while( iter != _observers.end()) {
        if (*iter) {
          (*iter)->update();
        }
        iter++;
      }
    }
    
    } // end of namespace