C语言/Sqlite3数据库

class  VGA
{
public:
	 void play()
	{
		cout << "VGA" << endl;
	}
};
class HDMI
{
public:
	void play() {
		cout << "HDMI" << endl;
	}
};
class computer
{
public:
	void playVideo(VGA* a)
	{
		a->play();
	}
};
class VGATOHDMI:public VGA
{
	HDMI* hdm;
public:
	VGATOHDMI(HDMI* hdmi)
	{
		hdm = hdmi;
	}
	//此play函数相当于转换头
	void play()
	{
		hdm->play();
	}
};
int main()
{
	computer* c = new computer();
	c->playVideo(new VGA());
	HDMI* hdi = new HDMI();   //本来不具有使用HDMI的功能，我们进行转换让其可以使用HDMI
	c->playVideo(new VGATOHDMI(hdi));
}