// Component 类
class Component
{
public:
	virtual void Operation() = NULL;
};

// ConcreteComponent 类
class ConcreteComponent : public Component
{
public:
	void Operation()
	{
		// 具体的对象操作 
	}
};

// Decorator 类
class Decorator : public Component
{
protected: 
	Component* component;		// 需初始化为NULL
	
public:
	void SetComponent(Component* component)
	{
		this->component = component;
	}
	
	void Operation()
	{
		if( component != NULL )
		{
			component.Operation();
		}
	}
	
};

// ConcreteDecoratorA
class ConcreteDecoratorA : public Decorator
{
private:
	std::string addedState;		// 任意结构数据

public:
	void Operation()
	{
		Decorator::Operation();
		addedState = "New State";
		// TO-DO: Add your extra code
	}
};

// ConcreteDecoratorB
class ConcreteDecoratorB : public Decorator
{
public:
	void Operation()
	{
		Decorator::Operation();
		AddedBehavior();
		// TO-DO: Add your extra code
	}

private:
	void AddedBehavior()
	{
		// TO-DO: Add your extra code
	}
};

// Main
int main()
{
	...
	
	ConcreteComponent* c = new ConcreteComponent();
	ConcreteDecoratorA* d1 = new ConcreteDecoratorA();
	ConcreteDecoratorB* d2 = new ConcreteDecoratorB();
	
	d1.SetComponent(c);
	d2.SetComponent(d1);
	d2.Operation();
	
	...
}