interview/DesignPattern/ObserverPattern/ObserverMain.cpp at master · zooyer/interview · GitHub

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//
// Created by xiemenghui on 2018/7/21.
//

#include"ObserverMain.h"

voidObserverMain()
{
// 创建主题
 ConcreteSubject * pSubject = newConcreteSubject();

// 创建观察者
 IObserver * pObserver1 = newConcreteObserver("Jack Ma");
 IObserver * pObserver2 = newConcreteObserver("Pony");

// 注册观察者
 pSubject->Attach(pObserver1);
 pSubject->Attach(pObserver2);

// 更改价格，并通知观察者
 pSubject->SetPrice(12.5);
 pSubject->Notify();

// 注销一个观察者
 pSubject->Detach(pObserver2);

// 再次更改状态，并通知观察者
 pSubject->SetPrice(15.0);
 pSubject->Notify();

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