设计模式-行为-职责链

#pragma once

#ifndef CHAINOFRESPONSIBILITY_H 

#define CHAINOFRESPONSIBILITY_H 

#include  

// 抽象基类,定义一个处理请求的接口 
class Handler 
{ 
public: 
	Handler(Handler *pSuccessor = NULL); 
	virtual ~Handler(); 

	// 纯虚函数,由派生类实现 
	virtual void HandleRequest() = 0; 

protected: 
	Handler* m_pNextHandler; //if pNextHandler is null,handler it itself
}; 

class ConcreateHandler1 : public Handler 
{ 
public: 
	ConcreateHandler1(Handler *pNextHandler = NULL) 
		: Handler(pNextHandler){} 
	virtual ~ConcreateHandler1(){} 
	virtual void HandleRequest(); 
}; 

class ConcreateHandler2 : public Handler 
{ 
public: 
	ConcreateHandler2(Handler *pNextHandler = NULL) 
		: Handler(pNextHandler){} 
	virtual ~ConcreateHandler2(){} 
	virtual void HandleRequest(); 
}; 

#endif 

#include "StdAfx.h"
#include "chainofresponsibility_impl.h"

#include  

Handler::Handler(Handler *pNextHandler /* = NULL*/) 
: m_pNextHandler(pNextHandler) 
{ 
} 

Handler::~Handler() 
{ 
	delete m_pNextHandler; 
	m_pNextHandler = NULL; 
} 

void ConcreateHandler1::HandleRequest() 
{ 
	if (m_pNextHandler) 
	{ 
		std::cout