设计模式：Adapter模式

//原来的打印
class Print   
{
public:
	void PrintText(string str)
	{
		cout<< str ; 
	}
};

//新要求，打印加括号
class NewPrint      
{
public:
	virtual void PrintText(string str) = 0;
};

//适配层：委托方式
class Adapter: public NewPrint  
{
	Print print;   //委托方式
public:
	Adapter(Print print)
	{
		this->print = print;
	}
	
	void PrintText(string str)
	{
		cout<< "( ";
		print.PrintText(str);
		cout<< " )" << endl;;
	}
};

int main() 
{
	Print p;
	NewPrint* np = new Adapter(p);
	np->PrintText("niu bi le!");
	return 0;
}

//适配层：继承的方式
class Adapter: public Print, public NewPrint  //继承方式
{
public:
	void NewPrintText(string str)
	{
		cout<< "( ";
		PrintText(str);
		cout<< " )" << endl;;
	}
};

int main() 
{
	NewPrint* np = new Adapter;
	np->NewPrintText("niu bi le!");
	return 0;
}