Subject.hpp

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// vim:sw=2:ts=8
#ifndef SUBJECT__HPP
#define SUBJECT__HPP

#include <list>

#include "def_graph.hpp"

#include "Observer.hpp"


namespace gns {


  class Subject
  {
    protected:
      std::list<Observer*> observers;

    public:
      Subject();

      virtual ~Subject();

      virtual void attach(Observer *obs);

      virtual void detach(Observer *obs);

      virtual void notify(long msg, Item item = Item());

      virtual std::list<Observer*> get_observers();
  };

}

#endif

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