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意圖：用一個中介者對象封裝一系列的對象交互。中介者使各對象不需要顯式的相互引用，從而減小耦合。

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原文：默默的EEer

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

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實際就是指，利用一個中介者對象來連接兩個對象的操作。例如需求是，A對象更新/改變了，B對象也跟著相應的更新/改變，不通過直接調用B對象

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一個例子，詳見注釋

#include <iostream>using namespace std;class Colleague;//定義一個中介者接口，包含對象改變所需調用函數。 class Mediator { public :virtual ~Mediator(){}virtual void changed(Colleague *)=0;};//定義"同事"類接口，初始化需要一個中介者對象，并通過該類更新另外一個"同事" class Colleague { public ://初始化中介者類對象Colleague(Mediator * mediator){this->mediator =mediator;}//更新另外一個類virtual void changed(){mediator->changed(this);} private:Mediator *mediator; };//具體的同事類1 class ConcreteColleague1 :public Colleague { public:ConcreteColleague1(Mediator * mediator):Colleague(mediator){}void update(){cout<<"update ConcreteColleague1 from ConcreteColleague2"<<endl;} }; //具體的同事類2 class ConcreteColleague2 :public Colleague { public :ConcreteColleague2(Mediator * mediator):Colleague(mediator){}void update(){cout<<"update ConcreteColleague2 from ConcreteColleague1"<<endl;} };//具體的中介者類，實現更新函數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"通過中介者更新"同事2" colleague1.changed();//"同事2"通過中介者更新"同事1" colleague2.changed();}

轉載于:https://www.cnblogs.com/hebaichuanyeah/p/6091506.html

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