observer.h

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//: C10:Observer.h
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// The Observer interface.
#ifndef OBSERVER_H
#define OBSERVER_H

class Observable;
class Argument {};

class Observer {
public:
  // Called by the observed object, whenever
  // the observed object is changed:
  virtual void update(Observable* o, Argument* arg) = 0;
  virtual ~Observer() {}
};
#endif // OBSERVER_H ///:~