//
// Created by xiemenghui on 2018年7月21日.
//

#include "ObserverMain.h"

void ObserverMain()
{
 // Create Subject
 ConcreteSubject * pSubject = new ConcreteSubject();

 // Create Observer
 IObserver * pObserver1 = new ConcreteObserver("Jack Ma");
 IObserver * pObserver2 = new ConcreteObserver("Pony");

 // Attach Observers
 pSubject->Attach(pObserver1);
 pSubject->Attach(pObserver2);

 // Change the price and notify the observer
 pSubject->SetPrice(12.5);
 pSubject->Notify();

 // Detach Observers
 pSubject->Detach(pObserver2);

 // Change the state again and notify the observer
 pSubject->SetPrice(15.0);
 pSubject->Notify();

 SAFE_DELETE(pObserver1);
 SAFE_DELETE(pObserver2);
 SAFE_DELETE(pSubject);
}