重新温习GOF23到第18个中介者模式了，感觉还是蛮不错的，写了一个小小的Demo来解释下他们之间的关系。

中介者模式其实就相当于：中介，租房人，还有房主三者之间的关系。

房主A，租房人B首先联系了中介，在中介那里记名字了。

房主A有空房了，发条消息给中介，中介将A有空房的消息发给其他人。

在此之上，demo做了小小扩充，当又有租房人C联系中介，B发了条消息，A与C都会收到B的消息。

#include <iostream>
#include <vector>
using namespace std;
#include <crtdbg.h>
class Person;
class Mediator
{
public:virtual void SendMsg(string msg, Person *pItem) = 0;
};class Person
{
public:Person(Mediator *pMediator):m_pMediator(pMediator){}virtual void Say(string msg) = 0;virtual void GetMsg(string msg) = 0;protected:Mediator *m_pMediator;
};class PersonA : public Person
{
public:PersonA(Mediator *pMediator):Person(pMediator){}virtual void Say(string msg){cout<<"PersonA said:"<<endl;m_pMediator->SendMsg(msg, this);}void GetMsg(string msg){cout<<"PersonA GetMsg: "<<msg.c_str()<<endl;}
};class PersonB : public Person
{
public:PersonB(Mediator *pMediator):Person(pMediator){}virtual void Say(string msg){cout<<"PersonB said:"<<endl;m_pMediator->SendMsg(msg, this);}void GetMsg(string msg){cout<<"PersonB GetMsg: "<<msg.c_str()<<endl;}
private:
};class PersonC : public Person
{
public:PersonC(Mediator *pMediator):Person(pMediator){}virtual void Say(string msg){cout<<"PersonC said:"<<endl;m_pMediator->SendMsg(msg, this);}void GetMsg(string msg){cout<<"PersonC GetMsg: "<<msg.c_str()<<endl;}
private:
};class ConcreateMediator : public Mediator
{
private:vector<Person*> conentList;
public:void AddFriend(Person* pPerson)  // 没有添加该好友，则添加进去{vector<Person*>::iterator iter = conentList.begin();for (; iter != conentList.end(); iter++){if(*iter == pPerson)break;}if(iter == conentList.end()){conentList.push_back(pPerson);}}void SendMsg(string msg, Person *pItem) //如假设A不认识其他人，A发送信息，通过中介，则可以发送给其他的人{vector<Person*>::iterator iter = conentList.begin();while(iter != conentList.end()){if(*iter != pItem)(*iter)->GetMsg(msg);iter++;}}
};
void main()
{_CrtSetDbgFlag(_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF) | _CRTDBG_LEAK_CHECK_DF);ConcreateMediator *pMediator = new ConcreateMediator();Person *pA = new PersonA(pMediator);Person *pB = new PersonB(pMediator);Person *pC = new PersonC(pMediator);pMediator->AddFriend(pA);pMediator->AddFriend(pB);pA->Say("call JesonYang");pMediator->AddFriend(pC);pB->Say("demo by yc7369");delete pA;delete pB;delete pC;delete pMediator;}