#pragma once #include "stdafx.h" #include<set> #include<list> #include<string> #include<iostream> #include<windows.h> using namespace std;//設(shè)計(jì)模式-觀察者模式Observer //定義了一種一對(duì)多的依賴關(guān)系，讓多個(gè)觀察者對(duì)象同時(shí)監(jiān)聽某一個(gè)主題對(duì)象 //這個(gè)主題對(duì)象在狀態(tài)發(fā)生變化時(shí)，會(huì)通知所有觀察者對(duì)象，使他們能夠自動(dòng)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(tài)是" << m_strObserverState << endl;} };int main() {//一個(gè)前臺(tái)，幾個(gè)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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