先上uml图：
意图：动态地给一个对象添加一些额外的职责。就增加功能来说，Decorator模式相比生成子类更为灵活。 uml解析：装饰者模式又名包装器，顾名思义就是给某个对象添加一些功能，，而不是给整个类添加一些功能。Component跟Decorator是聚合关系，子类ConcreteDecoratorA和ConcreteDecoratorB实现具体对Component的修饰。 下面给出可执行的示例代码： Decorator.h
namespace std;class Component{public:Component(void);virtual ~Component(void);virtual void Operation()=0;};class ConcreteComponent:public Component{public:void Operation();};class Decorator:public Component{public:Decorator(Component *component):m_Component(component){}void Operation();protected:Component *m_Component;};class ConcreteDecoratorA:public Decorator{public:ConcreteDecoratorA(Component *component):Decorator(component){}void Operation();void AddState();};class ConcreteDecoratorB:public Decorator{public:ConcreteDecoratorB(Component *component):Decorator(component){}void Operation();void AddBehavior();};
Decorator.cpp
#include “Component.h”Component::Component(void){}Component::~Component(void){}void ConcreteComponent::Operation(){cout<<“ConcreteComponent”<<endl;}void Decorator::Operation(){m_Component->Operation();};void ConcreteDecoratorA::AddState(){cout<<“AddState”<<endl;}void ConcreteDecoratorA::Operation(){AddState();m_Component->Operation();}void ConcreteDecoratorB::AddBehavior(){cout<<“AddBehavior”<<endl;}void ConcreteDecoratorB::Operation(){AddBehavior();m_Component->Operation();}
main.cpp
#include “Component.h”int main(int argc,char **argv){//未装饰Component *p1=new ConcreteComponent;p1->Operation();//DecoratorAComponent *p2=new ConcreteDecoratorA(p1);p2->Operation();//DecoratorBComponent *p3=new ConcreteDecoratorB(p1);p3->Operation();return 0;}
执行结果：
可看到分别对ConcreteComponent的装饰。
快乐要懂得分享，才能加倍的快乐
