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) = 0;
};

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

        }

        virtual void Send(string strMes) = 0;

        virtual void Notify(string strMes) = 0;

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 0;
}
////////////////////////////////////////////
[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!