#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();}