设计模式——中介者模式/调停者模式（C++实现）

 #include <iostream>
 #include <string>

 using namespace std;

 class Colleague;

 class Mediator
 {
 public:
         virtual void Send(string strMessage, Colleague* pstColleague) = ;
 };

 class Colleague
 {
 public:
         Colleague(Mediator* pstMediator): m_pstMediator(pstMediator)
         {

         }

         virtual void Send(string strMes) = ;

         virtual void Notify(string strMes) = ;

 protected:
         Mediator* m_pstMediator;
 };

 class ConcreteColleagueA: public Colleague
 {
 public:
         ConcreteColleagueA(Mediator* pstMediator):Colleague(pstMediator)
         {

         }

         virtual void Send(string strMsg)
         {
                 m_pstMediator->Send(strMsg, this);

         }

         virtual void Notify(string strMes)
         {
                 cout<< "同事1得到消息： "<< strMes<< endl;
         }
 };

 class ConcreteColleagueB: public Colleague
 {
 public:
         ConcreteColleagueB(Mediator* pstMediator):Colleague(pstMediator)
         {

         }

         virtual void Send(string strMsg)
         {
                 m_pstMediator->Send(strMsg, this);

         }

         virtual void Notify(string strMes)
         {
                 cout<< "同事2得到消息： "<< strMes<< endl;
         }
 };

 class ConcreteMediator: public Mediator
 {
 public:
         void SetColleagueA(ConcreteColleagueA* pstColleague)
         {
                 m_pstColleagueA = pstColleague;
         }

         void SetColleagueB(ConcreteColleagueB* pstColleague)
         {
                 m_pstColleagueB = pstColleague;
         }

         virtual void Send(string strMes, Colleague* pstColleague)
         {
                 if (pstColleague == m_pstColleagueA)
                 {
                         m_pstColleagueB->Notify(strMes);
                 }
                 else
                 {
                         m_pstColleagueA->Notify(strMes);
                 }
         }

 private:
         ConcreteColleagueA* m_pstColleagueA;
         ConcreteColleagueB* m_pstColleagueB;
 };

 int main(int argc, char* argv[])
 {
         ConcreteMediator* pstMediatorA = new ConcreteMediator();

         ConcreteColleagueA* pstColleagueA = new ConcreteColleagueA(pstMediatorA);
         ConcreteColleagueB* pstColleagueB = new ConcreteColleagueB(pstMediatorA);

         pstMediatorA->SetColleagueA(pstColleagueA);
         pstMediatorA->SetColleagueB(pstColleagueB);

         pstColleagueA->Send("How are you?");
         pstColleagueB->Send("I am fine, Thank You!");

         return ;
 }
 ////////////////////////////////////////////
 [root@ ~/learn_code/design_pattern/21_mediator]$ ./mediator
 同事2得到消息： How are you?
 同事1得到消息： I am fine, Thank You!