设计模式-结构型-装饰

#pragma once

#ifndef DECORATOR_H 

#define DECORATOR_H 

// 抽象基类,定义一个对象接口,可以为这个接口动态的添加职责. 
class Component 
{ 
public: 
	Component(){} 
	virtual ~Component(){} 

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

// 抽象基类,维护一个指向Component对象的指针 
class Decorator : public Component 
{ 
public: 
	Decorator(Component* pComponent) 
		: m_pComponent(pComponent){} 
	virtual ~Decorator(); 

protected: 
		Component* m_pComponent; 
}; 

// 派生自Component,在这里表示需要给它动态添加职责的类 
class ConcreateComponent : public Component 
{ 
public: 
	ConcreateComponent(){} 
	virtual ~ConcreateComponent(){} 
	virtual void Operation(); 
}; 

// 派生自Decorator,这里代表为ConcreateComponent动态添加职责的类 
class ConcreateDecorator : public Decorator 
{ 
public: 
	ConcreateDecorator(Component* pComponent) 
		: Decorator(pComponent){} 
	virtual ~ConcreateDecorator(){} 
	virtual void Operation(); 

private: 
	void AddedBehavior(); 
}; 

#endif 

#include "StdAfx.h"
#include "decorator_impl.h"

#include  

Decorator::~Decorator() 
{ 
	delete m_pComponent; 
	m_pComponent = NULL; 
} 

void ConcreateComponent::Operation() 
{ 
	std::cout Operation(); //componet原有职责
	AddedBehavior(); //decorator动态添加职责
} 

void ConcreateDecorator::AddedBehavior() 
{ 
	std::cout