C++ 设计模式之中介者模式

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Mediator中介者模式

作用：用一个中介对象来封装一系列的对象交互。中介者使各对象不需要显式地相互引用，从而使其耦合松散，而且可以独立地改变它们之间的交互。

类图：

下面是代码实例：

#include"stdafx.h"#include<iostream>#include<string>using namespace std;//class  Mediator;class Colleage;class Mediator{public:virtual ~Mediator(){}virtual void SendMsg(string,Colleage *) {}protected:Mediator(){}};class Colleage{public:virtual ~Colleage(){}/*virtual void SetMediator(Mediator *pMediator){m_Mediator = pMediator;}*/virtual void SendMsg(string msg) = 0;virtual void GetMsg(string msg) = 0;protected:Colleage(Mediator *pMediator){m_Mediator = pMediator;}Mediator * m_Mediator;private:};class ConcreteColleageA : public Colleage{public:~ConcreteColleageA(){}ConcreteColleageA(Mediator *pMediator):Colleage(pMediator) {// Colleage(pMediator); } void SendMsg(string msg) {this->m_Mediator->SendMsg(msg,this); } void GetMsg(string msg) { cout<<"ConcreteColleageA Receive:" <<msg<<endl; }};class ConcreteColleageB : public Colleage{public:~ConcreteColleageB(){} ConcreteColleageB(Mediator *pMediator): Colleage(pMediator) { //Colleage(pMediator); } void SendMsg(string msg) { this->m_Mediator->SendMsg(msg,this); } void GetMsg(string msg) { cout<<"ConcreteColleageB Receive:" <<msg<<endl; }};class ConcreteMediator : public Mediator{public:ConcreteMediator(){}~ConcreteMediator(){}void SetColleageA(Colleage *pColleage){m_ColleageA = pColleage;}void SetColleageB(Colleage *pColleage){m_ColleageB = pColleage;}void SendMsg(string msg,Colleage *pColleage){if(pColleage == m_ColleageA){m_ColleageA->GetMsg(msg);}else if(pColleage == m_ColleageB){m_ColleageB->GetMsg(msg);}}private:Colleage *m_ColleageA;Colleage *m_ColleageB;};

// MediatorMode.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include"Mediator.hpp"int _tmain(int argc, _TCHAR* argv[]){ConcreteMediator *pMediator = new ConcreteMediator(); Colleage *p1 = new ConcreteColleageA(pMediator);Colleage *p2 = new ConcreteColleageB(pMediator);  pMediator->SetColleageA(p1);pMediator->SetColleageB(p2);/*pMediator->SendMsg("CCC",p1);pMediator->SendMsg("DDD",p2);*/p1->SendMsg("AAA");p2->SendMsg("BBB");system("pause");return 0;}

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