设计模式复习-职责链模式

#pragma once
#include "stdafx.h"
#include<set>
#include<string>
#include<iostream>
using namespace std;

/*
	设计模式-职责链模式（Chain of Responsibility）
	使多个对象都有机会处理请求，从而避免请求的开发者和接受者之间的耦合关系。
将这个对象连成一条链，并沿着这条链传递请求，直到有一个对象处理他为止。
*/

class CHandler {//定义一个处理请求的接口
protected:
	CHandler *mpSuccessor;
public:
	CHandler() {mpSuccessor = NULL;}
	void SetSuccessor(CHandler *pSuccessor) {
		mpSuccessor = pSuccessor;
	}
	virtual void HandlerRequest(const int &nRequest) = 0;
};

class CConcreteHandler1 : public CHandler {//处理0-10之间的事物
public:
	void HandlerRequest(const int &nRequest) {
		if (nRequest >= 0 && nRequest < 10) {
			cout << "CConcreteHandler1:" << nRequest << endl;
		}
		else if (mpSuccessor != NULL) {
			mpSuccessor->HandlerRequest(nRequest);
		}
	}
};

class CConcreteHandler2 : public CHandler {//处理10以上的事物
public:
	void HandlerRequest(const int &nRequest) {
		if (nRequest >= 10) {
			cout << "CConcreteHandler2:" << nRequest << endl;
		}
		else if (mpSuccessor != NULL) {
			mpSuccessor->HandlerRequest(nRequest);
		}
	}
};


int main() {

	CHandler *pH1 = new CConcreteHandler1();
	CHandler *pH2 = new CConcreteHandler2();
	pH1->SetSuccessor(pH2);
	for (int index = 0; index <= 15; index++) {
		pH1->HandlerRequest(index);
	}
	getchar();
	return 0;
}