[设计模式]8. C++与中介者模式(mediator pattern)

 

意图：用一个中介者对象封装一系列的对象交互。中介者使各对象不需要显式的相互引用，从而减小耦合。

 

原文：默默的EEer

地址：http://www.cnblogs.com/hebaichuanyeah/p/6091506.html

 

实际就是指，利用一个中介者对象来连接两个对象的操作。例如需求是，A对象更新/改变了，B对象也跟着相应的更新/改变，不通过直接调用B对象

 

一个例子，详见注释

#include <iostream>using namespace std;class Colleague;//定义一个中介者接口，包含对象改变所需调用函数。 class Mediator { public :virtual ~Mediator(){}virtual void changed(Colleague *)=0;};//定义"同事"类接口，初始化需要一个中介者对象，并通过该类更新另外一个"同事" class Colleague { public ://初始化中介者类对象Colleague(Mediator * mediator){this->mediator =mediator;}//更新另外一个类virtual void changed(){mediator->changed(this);} private:Mediator *mediator; };//具体的同事类1 class ConcreteColleague1 :public Colleague { public:ConcreteColleague1(Mediator * mediator):Colleague(mediator){}void update(){cout<<"update ConcreteColleague1 from ConcreteColleague2"<<endl;} }; //具体的同事类2 class ConcreteColleague2 :public Colleague { public :ConcreteColleague2(Mediator * mediator):Colleague(mediator){}void update(){cout<<"update ConcreteColleague2 from ConcreteColleague1"<<endl;} };//具体的中介者类，实现更新函数changed。 class ConcreteMediator :public Mediator { private:ConcreteColleague1 * colleague1;ConcreteColleague2 * colleague2; public:void setColleague1(ConcreteColleague1 * colleague){colleague1 = colleague;}void setColleague2(ConcreteColleague2 * colleague){colleague2 = colleague;}ConcreteMediator(){//colleague1 = new ConcreteColleague1(this); }~ConcreteMediator(){}virtual void changed(Colleague* colleague){if(colleague == colleague1){colleague2->update();}else if(colleague == colleague2){colleague1->update();}else;}}; main() {ConcreteMediator concreteMediator;ConcreteColleague1 colleague1(&concreteMediator);ConcreteColleague2 colleague2(&concreteMediator);concreteMediator.setColleague1(&colleague1);concreteMediator.setColleague2(&colleague2);//"同事1"通过中介者更新"同事2" colleague1.changed();//"同事2"通过中介者更新"同事1" colleague2.changed();}

转载于:https://www.cnblogs.com/hebaichuanyeah/p/6091506.html

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