Code: framework by 0rel

#define STRAIGHT	0

class Thing
{
public:
	Thing( int a ) : attribute( a ) {}
	virtual bool draw() = 0;
	virtual Thing * follow() = 0;
protected:
	int attribute;
};

class Line : public Thing
{
public:
	Line( int a ) : Thing( a ) {}
	virtual bool draw() 
	{
		// todo
		return true;
	}
	virtual Thing * follow() 
	{
		// todo
		return this;
	}
};

int main()
{
	Thing *it = new Line( STRAIGHT ) ;
	while( it && it->draw() )
	{
		it = it->follow();
	}
	if( it ) delete it;
	return 0;
}