设计模式之装饰模式

 #include "stdafx.h"
#include <iostream>
#include <string>

using namespace std;

/*************************************
装饰模式
*************************************/

class Person {
public:
	Person(){}
	Person(string strName) :name_(strName) {}
	virtual void Show() {
		cout << " 装饰的 "<< name_ << endl;
	}
private:
	Person(const Person& p);
	string name_;
};

/*
抽象 装饰
*/

class Finery :public Person{
public:
	Finery():p_(NULL){}
	void Decorate(Person* p){
		p_ = p; 
	}

	void Show() {
		if (p_) {
			p_->Show();
		}
	}
protected:
	Person* p_;
};
/*
具体装饰
*/
class TShirts :public Finery {
public:
	void Show() {
		cout << "T恤衫" << " ";
		Finery::Show();
	}
};

/*
具体装饰
*/
class BigTrousers :public Finery {
public:
	void Show() {
		cout << "大垮裤" << " ";
		Finery::Show();
	}
};

class LeatherShoes : public Finery{
public:
	void Show()
	{
		std::cout << "皮鞋" << " ";
		Finery::Show();
	}
};


int main()
{
	Person* p = new Person("行人");
	TShirts* pts = new TShirts();
	BigTrousers* pbt = new BigTrousers();
	LeatherShoes* pls = new LeatherShoes();
	pts->Decorate(p);
	pbt->Decorate(pts);
	pls->Decorate(pbt);
	pls->Show();
       return 0;
}

为一个类添加额外的功能装饰

参考 大话设计模式