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34 lines
712 B
C++
34 lines
712 B
C++
//
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// Created by xiemenghui on 2018/7/21.
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//
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#include "ObserverMain.h"
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void ObserverMain()
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{
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// 创建主题
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ConcreteSubject * pSubject = new ConcreteSubject();
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// 创建观察者
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IObserver * pObserver1 = new ConcreteObserver("Jack Ma");
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IObserver * pObserver2 = new ConcreteObserver("Pony");
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// 注册观察者
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pSubject->Attach(pObserver1);
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pSubject->Attach(pObserver2);
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// 更改价格，并通知观察者
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pSubject->SetPrice(12.5);
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pSubject->Notify();
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// 注销一个观察者
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pSubject->Detach(pObserver2);
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// 再次更改状态，并通知观察者
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pSubject->SetPrice(15.0);
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pSubject->Notify();
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SAFE_DELETE(pObserver1);
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SAFE_DELETE(pObserver2);
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SAFE_DELETE(pSubject);
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} |