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#include <iostream>

#include <string>

using namespace std;

class Person;

class Mediator {

public:

virtual void Send(const string& msg, Person* person) = 0;

virtual ~Mediator() { }

void BuildRelation(Person *a, Person *b) {

m_a = a;

m_b = b;

}

protected:

Person *m_a;

Person *m_b;

};

class ConcreteMediator :public Mediator {

public:

void Send(const string& msg, Person* person) {

if (person == m_a) {

cout << msg << "--Mediator--PersonB" << endl;

}

else if (person == m_b) {

cout << msg << "--Mediator--PersonA" << endl;

}

}

};

class Person {

public:

Person(Mediator*md):_md(md) { }

virtual void SendMessage(const string& msg) = 0;

virtual ~Person() { }

protected:

Mediator* _md;

};

class ConcretePersonA :public Person {

public:

ConcretePersonA(Mediator* md):Person(md) { }

void SendMessage(const string& msg) {

_md->Send(msg, this);

}

};

class ConcretePersonB :public Person {

public:

ConcretePersonB(Mediator* md):Person(md) { }

void SendMessage(const string& msg) {

_md->Send(msg, this);

}

};

int main() {

Mediator *mediator = new ConcreteMediator();

Person *personA = new ConcretePersonA(mediator);

Person *personB = new ConcretePersonB(mediator);

mediator->BuildRelation(personA, personB);

personA->SendMessage("PersonA");

personB->SendMessage("PersonB");

delete personA;

delete personB;

delete mediator;

return 0;

}