Decorator 设计模式

#include <iostream>
class Component
{
public:
	virtual void Operation(){};
};
class ConcreteComponent: public Component
{
public:
	virtual void Operation()
	{
		std::cout<<"orginal property"<<std::endl;
	}
};
class Decorator: public Component
{
public:
	Decorator(Component* co)
	{
		this->_co=co;
	}
	~Decorator()
	{
		delete _co;
	}
protected:
	Component* _co;
};
class ConcreteDecorator: public Decorator
{
public:
	ConcreteDecorator(Component* coa):Decorator(coa) {};
	virtual void Operation()
	{
		_co->Operation();
		
			std::cout<<"AddBehavor"<<std::endl;
		
	}
};

int main(int argc, char* argv[])
{
	Component* com=new ConcreteComponent();
	Decorator* dec=new ConcreteDecorator(com);
	dec->Operation();
	return 0;
}

注意ConcreteComponent和Decorator共用基类，统一接口，不过不统一， 也可以引用指针实现，即不Decorator 不继承Component, 但为什么一定要继承，我也不知道