Observer.h

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/* This software and supporting documentation are distributed by
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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