【设计模式】之十Mediator

Type: Behavioral

Mediator: 定义一个对象，包装一系列对象如何交互。这些对象不必明确地互相引用，从而促进松散耦合，并且能够使你独立地改变他们之间的交互。

#include <iostream>using namespace std;class Mediator{public:    virtual void inform(int id)=0;};class Colleague{public:    virtual void update()=0;};class ConcreteColleague: public Colleague{public:    ConcreteColleague(int id, Mediator* pMediator): mId(id),m_pMediator(pMediator){};    void update()    {        cout<<"ConcreteColleague"<<mId<<" update"<<endl;    };    void send()    {        cout<<"ConcreteColleague"<<mId<<" send"<<endl;        if(mId == 1)            m_pMediator->inform(2);        else if(mId == 2)            m_pMediator->inform(1);    };private:    int mId;    Mediator* m_pMediator; };class ConcreteMediator: public Mediator{public:    void inform(int id)    {        if(id==1){            m_pColleague1->update();        } else if(id == 2){            m_pColleague2->update();        }    };    void setColleague1(Colleague* pColleague)    {        m_pColleague1 = pColleague;    };    void setColleague2(Colleague* pColleague)    {        m_pColleague2 = pColleague;    };private:    Colleague* m_pColleague1;    Colleague* m_pColleague2;};int main(){    ConcreteMediator* pMediator = new ConcreteMediator();    ConcreteColleague* pColleague1 = new ConcreteColleague(1, pMediator);    ConcreteColleague* pColleague2 = new ConcreteColleague(2, pMediator);    pMediator->setColleague1(pColleague1);    pMediator->setColleague2(pColleague2);    pColleague1->send();    pColleague2->send();    system("pause");    return 0;}