#pragma once#ifndef DECORATOR_H #define DECORATOR_H // 抽象基類,定義一個對象接口,可以為這個接口動態(tài)的添加職責. class Component { public: Component(){} virtual ~Component(){} // 純虛函數(shù),由派生類實現(xiàn) virtual void Operation() = 0; }; // 抽象基類,維護一個指向Component對象的指針 class Decorator : public Component { public: Decorator(Component* pComponent) : m_pComponent(pComponent){} virtual ~Decorator(); protected: Component* m_pComponent; }; // 派生自Component,在這里表示需要給它動態(tài)添加職責的類 class ConcreateComponent : public Component { public: ConcreateComponent(){} virtual ~ConcreateComponent(){} virtual void Operation(); }; // 派生自Decorator,這里代表為ConcreateComponent動態(tài)添加職責的類 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 <iostream> Decorator::~Decorator() { delete m_pComponent; m_pComponent = NULL; } void ConcreateComponent::Operation() { std::cout << "Operation of ConcreateComponent\n"; } void ConcreateDecorator::Operation() { m_pComponent->Operation(); //componet原有職責AddedBehavior(); //decorator動態(tài)添加職責 } void ConcreateDecorator::AddedBehavior() { std::cout << "AddedBehavior of ConcreateDecorator\n"; }
// Decorator.cpp : 定義控制臺應(yīng)用程序的入口點。 //#include "stdafx.h" #include <stdlib.h> #include <iostream>#include "decorator_impl.h"using namespace std; //動態(tài)地給一個對象添加一些額外的職責。就增加功能來說，Decorator模式相比生成子類更為靈活 int _tmain(int argc, _TCHAR* argv[]) {// 初始化一個Component對象 Component* pComponent = new ConcreateComponent(); // 采用這個Component對象去初始化一個Decorator對象, cout<<"before decorator"<<endl;pComponent->Operation();cout<<endl;// 這樣就可以為這個Component 對象動態(tài)添加職責 Decorator* pDecorator = new ConcreateDecorator(pComponent); //Component* pDecorator = new ConcreateDecorator(pComponent); cout<<"after decorator"<<endl;//對外表現(xiàn)為執(zhí)行了component基本職責，并執(zhí)行了decorator動態(tài)添加的職責pDecorator->Operation(); delete pDecorator; system("pause"); return 0; }
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