来自「visualCplusplus学习课件大连东软培训教材」· 代码 · 共 50 行

#include "stdafx.h"
#include <iostream.h>
class CDraw
{
public:
	virtual void LButtonDown() = 0;
protected:
private:
};

class CRect : public CDraw
{
public:
	void LButtonDown();
protected:
private:
};

void CRect::LButtonDown()
{
	cout << "rect" << endl;
}

class CCircle : public CDraw
{
public:
	void LButtonDown();
protected:
private:
};

void CCircle::LButtonDown()
{
	cout << "circle" <<endl;
}

void OperDraw(CDraw& d)
{
	d.LButtonDown();
}

void main()
{
	CRect rect;
	CCircle circle;
	OperDraw(rect);
	OperDraw(circle);
}