#pragma once #include "stdafx.h" #include<set> #include<list> #include<string> #include<iostream> #include<windows.h> using namespace std;//設計模式-觀察者模式Observer //定義了一種一對多的依賴關系，讓多個觀察者對象同時監聽某一個主題對象 //這個主題對象在狀態發生變化時，會通知所有觀察者對象，使他們能夠自動更新自己。class CObserver {//抽象接口 public:virtual void Update() = 0; };class CSubject {//抽象通知者 private:set<CObserver *> m_HashMemory; public:CSubject(){m_HashMemory.clear();}~CSubject() {for each(CObserver *i in m_HashMemory) {delete i;}}void Attach(CObserver *pObserver) {m_HashMemory.insert(pObserver);}void Detach(CObserver *pObserver) {m_HashMemory.erase(pObserver);delete pObserver;}void Notify() {for each(CObserver *i in m_HashMemory) {i->Update();}} };class CConcreteSubjuct :public CSubject {//具體的通知著 private:string m_strSubjectState; public:CConcreteSubjuct(const string &strName) {m_strSubjectState = strName;}string GetName() {return m_strSubjectState;} };class ConcreteObserver :public CObserver{//具體的觀察者 private:string m_strName;string m_strObserverState;CConcreteSubjuct *m_pSubject; public:ConcreteObserver(CConcreteSubjuct *pSubject ,const string &strName) {m_pSubject = pSubject;m_strName = strName;}void Update() {m_strObserverState = m_pSubject->GetName();cout << "觀察者" << m_strName << "的新狀態是" << m_strObserverState << endl;} };int main() {//一個前臺，幾個員工CConcreteSubjuct *pQianTai = new CConcreteSubjuct("QianTai");ConcreteObserver *pYuanGongA = new ConcreteObserver(pQianTai ,"YuanGongA");ConcreteObserver *pYuanGongB = new ConcreteObserver(pQianTai, "YuanGongB");ConcreteObserver *pYuanGongC = new ConcreteObserver(pQianTai, "YuanGongC");pQianTai->Attach(pYuanGongA); pQianTai->Attach(pYuanGongB); pQianTai->Attach(pYuanGongC);pQianTai->Notify();pQianTai->Detach(pYuanGongB);pQianTai->Notify();getchar();return 0; }

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