Custom notification

Here is the interface for TShapeNotification. The implementation is not presented because it is standard.

  class TShapeNotification : public TNotification {
  public:
      MCollectibleDeclarationsMacro(TShapeNotification);
  
                                  TShapeNotification(const TInterest&, const MGraphic&);
                                  TShapeNotification(const TShapeNotification&);
      virtual                     ~TShapeNotification();
      const TShapeNotification&   operator =(const TShapeNotification&);
  
      const MGraphic*             GetShape() const;
  
      virtual TStream&            operator >>=(TStream&) const;
      virtual TStream&            operator <<=(TStream&);
  
      virtual Boolean             IsEqual(const MCollectible*) const;
  
  protected:
                                  TShapeNotification();
  
  private:
      MGraphic*                   fShape;
  
      enum { kOriginalVersion };
  };