设计模式c++实现：装饰(Decorator)模式

Posted 2022-12-11 skyman_2001

转载请注明，来自：http://blog.csdn.net/skyman_2001

class Component

public:
	Component() 
	virtual ~Component() 

	virtual void operation() = 0;
	virtual Component *remove() = 0;
;

class ConcreteComponent: public Component

public:
	ConcreteComponent() 
	~ConcreteComponent() 

	void operation()
	
		std::cout <<"Concrete component operation"<< std::endl;
	

	Component *remove()
	
		return this;
	
;

class Decorator : public Component

public:
	Decorator(Component *comp) : m_component(comp) 
	virtual ~Decorator() 
		 
	virtual void operation()
	
		m_component->operation();
	

	Component *remove()
	
		return m_component;
	
		 
private:
	Component *m_component;
;

class Decor1: public Decorator

public:
	Decor1(Component *comp) : Decorator(comp)
	virtual ~Decor1() 

	virtual void operation()
	
		Decorator::operation();
		addedBehavior();
	

private:	
	void addedBehavior()
	
		std::cout << "Decor1 addedBehavior" << std::endl;
	
;

class Decor2: public Decorator

public:
	Decor2(Component *comp) : Decorator(comp) 
	virtual ~Decor2() 

	virtual void operation()
	
		Decorator::operation();
		addedBehavior();
	

private:	
	void addedBehavior()
	
		std::cout << "Decor2 addedBehavior" << std::endl;
	
;

int _tmain(int argc, _TCHAR* argv[])

	Component* concrete = new ConcreteComponent();
	Component* decored1 = new Decor1(concrete);
	Component* decored2 = new Decor2(decored1);
	decored2->operation();

	cout << "---------------" << endl;

	Component* temp = decored2->remove();
	temp->operation();

	cout << "---------------" << endl;

	temp = temp->remove();
	temp->operation();

	cout << "---------------" << endl;

	temp = temp->remove();
	temp->operation();

	delete decored2;
	delete decored1;
	delete concrete;

	return 0;

运行结果：

Concrete component operation
Decor1 addedBehavior
Decor2 addedBehavior
---------------
Concrete component operation
Decor1 addedBehavior
---------------
Concrete component operation
---------------
Concrete component operation