大话设计模式中介者模式模式c++实现

中介者模式

其他二十三种设计模式

#include<iostream>
using namespace std;

//中介者模式
class Country;

//联合国机构
class UnitedNations {
    
    
public:
	virtual void Declare(string _message, Country* _colleague) = 0;
};

//国家
class Country {
    
    
public:
	Country(UnitedNations* _mediator) {
    
    
		this->mediator = _mediator;
	}

protected:
	UnitedNations* mediator;
};

//具体国家类
class USA :public Country {
    
    
public:
	USA(UnitedNations* _mediator) :Country(_mediator) {
    
    }

	void Declare(string _message) {
    
    
		mediator->Declare(_message, this);
	}
	void GetMessage(string _message) {
    
    
		cout << "美国获得的信息：" << _message << endl;
	}
};

class Iraq :public Country {
    
    
public:
	Iraq(UnitedNations* _mediator) :Country(_mediator) {
    
    }

	void Declare(string _message) {
    
    
		mediator->Declare(_message, this);
	}
	void GetMessage(string _message) {
    
    
		cout << "伊拉克获得的信息：" << _message << endl;
	}
};

//联合国安理会
class UnitedNationsSecurityCouncil :public UnitedNations {
    
    
public:
	USA* Colleague1(Country* _country) {
    
    
		this->colleague1 = (USA*)_country;
		return this->colleague1;
	}
	Iraq* Colleague2(Country* _country) {
    
    
		this->colleague2 = (Iraq*)_country;
		return this->colleague2;
	}

	virtual void Declare(string _message, Country* _colleague) {
    
    
		if (_colleague == colleague1)
			colleague2->GetMessage(_message);
		else
			colleague1->GetMessage(_message);
	}

private:
	USA* colleague1 = NULL;
	Iraq* colleague2 = NULL;
};

void test1() {
    
    
	UnitedNationsSecurityCouncil* UNSC = new UnitedNationsSecurityCouncil;
	USA* c1 = new USA(UNSC);
	Iraq* c2 = new Iraq(UNSC);

	UNSC->Colleague1(c1);
	UNSC->Colleague2(c2);

	c1->Declare("不准研制核武器，否则发动战争！");
	c2->Declare("我们没有核武器，也不怕侵略！");

	delete c2;
	delete c1;
	delete UNSC;
}

int main() {
    
    
	test1();
	return 0;
}