Observer.h

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/* -*- mode:c++ - */

#ifndef _Observer_H_
#define _Observer_H_

#include "libhippo.h"

class Observable;

namespace hippodraw
{
class MDL_HIPPOPLOT_API Observer 
{
protected:

  Observer();

public:

  virtual ~ Observer ();

  virtual void update ( const Observable * ) = 0;

  virtual void willDelete ( const Observable * );

};
} // namespace hippodraw
#endif // _Observer_H_

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