?? observer.h
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//: C25:Observer.h
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// 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;
};
#endif // OBSERVER_H ///:~
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