8-6(

C++多态性程序例子

#include <iostream.h>

class counter
{
public:
	counter() { v=0; }
	counter operator ++();
	counter operator ++(int );
	void print() { cout<<v<<endl; }
private:
	unsigned v;
};

counter counter::operator ++()
{
	v++;
	return *this;
}

counter counter::operator ++(int)
{
	counter t;
	t.v = v++;
	return t;
}

void main()
{
	counter c;
	for(int i=0; i<8; i++)
		c++;
	c.print();
	for(i=0; i<8; i++)
		++c;
	c.print();
}