设计模式20：中介者模式【行为型】

#include <iostream>using namespace std;//struct IMeditor;struct IPerson{public:IPerson() : m_pMeditor(NULL) { }virtual ~IPerson() { }void SetMeditor(IMeditor *pMeditor) { m_pMeditor = pMeditor; }virtual void SendMessage(string message) = 0;virtual void RecvMessage(string message) = 0;protected:IMeditor *m_pMeditor;};struct IMeditor{public:IMeditor(IPerson *pRenter, IPerson *pLandlord) : m_pRenter(pRenter), m_pLandlord(pLandlord) { }virtual ~IMeditor() { }virtual void SendMessage(string message, IPerson *pPerson) = 0;protected:IPerson *m_pRenter, *m_pLandlord;};class CRenter : public IPerson{public:CRenter() { }virtual ~CRenter() { }virtual void SendMessage(string message) { m_pMeditor->SendMessage(message,this); }virtual void RecvMessage(string message) { cout<<"租房者收到信息："<<message.c_str()<<endl; }};class CLandlord : public IPerson{public:CLandlord() { }virtual ~CLandlord() { }virtual void SendMessage(string message) { m_pMeditor->SendMessage(message,this); }virtual void RecvMessage(string message) { cout<<"房东收到信息："<<message.c_str()<<endl; }};class CHouseMeditor : public IMeditor{public:CHouseMeditor(IPerson *pRenter, IPerson *pLandlord) : IMeditor(pRenter,pLandlord) { }virtual ~CHouseMeditor() { }virtual void SendMessage(string message, IPerson *pPerson){if(m_pRenter == pPerson)m_pLandlord->RecvMessage(message);elsem_pRenter->RecvMessage(message);}};//void main(){CRenter renter;CLandlord landlord;CHouseMeditor houseMeditor(&renter,&landlord);renter.SetMeditor(&houseMeditor);landlord.SetMeditor(&houseMeditor);renter.SendMessage("求租房子。");landlord.SendMessage("出售房子。");}