设计模式之装饰模式

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#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();<br>       return 0;
}

为一个类添加额外的功能装饰

参考 大话设计模式

posted on   itdef  阅读(204)  评论(0编辑  收藏  举报

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