Observer.h

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/* This software and supporting documentation are distributed by
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 * and INRIA at the following URL "http://www.cecill.info".
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#ifndef ANA_OBSERVER_OBSERVER_H
#define ANA_OBSERVER_OBSERVER_H
 
#include <set>
 
namespace anatomist
{
  //--- forward declarations --------------------------------------------------
 
  class Observable;
 
 
  //--- class declarations ----------------------------------------------------

 
  class Observer
  {
  public:
    virtual ~Observer();

    virtual void update( const Observable* observable, void* arg ) = 0;
 
  protected:
    virtual void cleanupObserver();
    virtual void registerObservable( Observable* );
    virtual void unregisterObservable( Observable* );
    const std::set<Observable *> & observed() const { return _observed; }
 
  private:
    std::set<Observable *> _observed;
 
    friend class Observable;
  };
 
}
 
 
#endif