Design Pattern - Structural Pattern - Decorator

最新推荐文章于 2019-08-06 15:21:17 发布

welleo

最新推荐文章于 2019-08-06 15:21:17 发布

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分类专栏： UML/设计模式 C++语言文章标签： decorator class include null c

本文链接：https://blog.youkuaiyun.com/welleo/article/details/4317130

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本文通过一个C++实现的装饰者模式实例，展示了如何在不改变原有对象的基础上为其添加新的功能。该模式允许用户通过简单的对象组合来扩展行为，提供了一种比继承更灵活的替代方案。

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#include "stdafx.h"
#include <iostream>
using namespace std;

class Component
{
public:
virtual void Operation() = 0;

};

class ConcreteComponent : public Component
{
public:
virtual void Operation()
{
cout << "ConcreteComponent.Operation()" << endl;
}
};

class Decorator : public Component
{
public:
void SetComponent(Component *component)
{
this->component = component;
}

virtual void Operation()
{
  if (component != NULL)
  {
   component->Operation();
  }
}
protected:
Component *component;
};

class ConcreteDecoratorA : public Decorator
{
public:
virtual void Operation()
{
Decorator::Operation();
cout << "ConcreteDecoratorA.Operation()" << endl;
}
};

class ConcreteDecoratorB : public Decorator
{
public:
virtual void Operation()
{
  Decorator::Operation();
  AddedBehavior();
  cout << "ConcreteDecoratorB.Operation()" << endl;
}

void AddedBehavior()
{

}
};

int _tmain(int argc, _TCHAR* argv[])
{
ConcreteComponent *c = new ConcreteComponent();
ConcreteDecoratorA *d1 = new ConcreteDecoratorA();
ConcreteDecoratorB *d2 = new ConcreteDecoratorB();

d1->SetComponent(c);
d2->SetComponent(d1);

d2->Operation();

return 0;
}

输出结果：

ConcreteComponent.Operation()
ConcreteDecoratorA.Operation()
ConcreteDecoratorB.Operation()
请按任意键继续. . .