设计模式之装饰模式(Decorator)

装饰模式原理：给对象增加特性，这种特性是一种累加的效果

代码如下

#include <iostream>
#include <string>
#include <list>
using namespace std;

/************************************************************************/
/* 装饰模式的作用是为对象增加属性										*/
/************************************************************************/
class Phone
{
public:
	Phone(string name):m_name(name)
	{

	}
	Phone()
	{

	}
	virtual void show(){}
protected:
	string m_name;
};

class IPhone:public Phone
{
public:
	IPhone(string name):Phone(name)
	{

	}
	virtual void show(){cout << m_name << "的装饰" <<endl;}
};
class HTCPhone:public Phone
{
public:
	HTCPhone(string name):Phone(name)
	{

	}
	virtual void show(){cout << m_name << "的装饰" <<endl;}
};

class DecoratorPhone:public Phone
{
public:
	DecoratorPhone(Phone *pPhone)
	{
		m_pPhone = pPhone;
	}
	virtual void show()
	{
		m_pPhone->show();
	}
protected:
	Phone *m_pPhone;
};
class DecoratorPhoneA:public DecoratorPhone
{
public:
	DecoratorPhoneA(Phone *pPhone):
	  DecoratorPhone(pPhone)
	{

	}
	virtual void show()
	{
		DecoratorPhone::show();
		cout << "挂饰" <<endl;
	}
};
class DecoratorPhoneB:public DecoratorPhone
{
public:
	DecoratorPhoneB(Phone *pPhone):DecoratorPhone(pPhone){}
	virtual void show()
	{
		DecoratorPhone::show();
		cout << "贴膜" <<endl;
	}
};

int main()
{
 Phone *iphone = new IPhone("iphone4s");
 Phone *dpa = new DecoratorPhoneA(iphone);
 Phone *dpb = new DecoratorPhoneB(dpa);
 dpb->show();

	return 0;
}