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ObserverPattern.cpp

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#include "Subject.h"

#include "Observer.h"

int main() {

Subject *sub = new ConcreteSubject();

Observer *o1 = new ConcreteObserver(sub);

Observer *o2 = new ConcreteObserver(sub);

sub->SetState("old");

sub->Notify();

sub->SetState("new");

sub->Notify();

delete o1;

delete o2;

delete sub;

return 0;

}