Design Patterns: bridge mode

Objective: "Realizing the class hierarchy," "functional class hierarchy" and classification

Functional class level: through inheritance to add functionality class (add a normal function)

To achieve levels of class: implement virtual functions through inheritance class

Appreciated: and bridging method same adapter mode

example:

class DisplayImpl
{
public:
	virtual void open() = 0;
	virtual void print() = 0;
	virtual void close() = 0;
};

 class StringDisplayImpl: public DisplayImpl //实现性扩展
 {
 public:
	void open()
	{
		cout << "open()" << endl;
	}
	
	void print()
	{
		cout << "print()" << endl;
	}
	
	void close()
	{
		cout << "close()" << endl;
	}
 };

Display class 
{ 
	DisplayImpl * pImpl; bridged core code // 
public: 
	Display (DisplayImpl pImpl *) 
	{ 
		this-> = pImpl pImpl; 
	} 
	
	void Print () 
	{ 
		pImpl-> Open (); 
		pImpl-> Print (); 
		pImpl -> Close (); 
	} 
}; 

class multidisplay: // public Display functional extensions 
{ 
public: 
	multidisplay (DisplayImpl pImpl *): Display (pImpl) 
	{} 
	
	void Multiprint () 
	{ 
		for (int I = 0; I <. 5 ; I ++) 
		{ 
			Print (); 
		} 
	} 
};

int main() 
{
	Display* d = new Display(new StringDisplayImpl());
	d->print();
	
	cout << endl;
	
	MultiDisplay* md = new MultiDisplay(new StringDisplayImpl());
	md->multiPrint();
	
	return 0;
}