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  1. //: C25:Observer.h
  2. // From Thinking in C++, 2nd Edition
  3. // Available at http://www.BruceEckel.com
  4. // (c) Bruce Eckel 1999
  5. // Copyright notice in Copyright.txt
  6. // The Observer interface
  7. #ifndef OBSERVER_H
  8. #define OBSERVER_H
  9.  
  10. class Observable;
  11. class Argument {};
  12.  
  13. class Observer {
  14. public:
  15.   // Called by the observed object, whenever 
  16.   // the observed object is changed:
  17.   virtual void 
  18.   update(Observable* o, Argument * arg) = 0;
  19. };
  20. #endif // OBSERVER_H ///:~
  21.