Callback-Example/Ball.h

#ifndef BALL_H
#define BALL_H

#include "GraphicsObject.h"
//#include "PhysicsObject.h"

class Ball : public GraphicsObject
{
public:
	Ball() : GraphicsObject(&Ball::SetX, this) // pointer to self (specific instance)
		{
			instance_num = ++instance_counter;
			// NOTE(dev): don't go above 100, please, for the sake of the example.
		}
	void GetXFromPhysicsSimulation()
		{
			x = instance_num + ((rand() % 10) * 100); // move around by ten, but keep single digit
		}
	static void SetX(int &x, void *instance)
		{
			Ball *ball = static_cast<Ball*>(instance);
			ball->GetXFromPhysicsSimulation();
			return;
		}

private:
	static int instance_counter;
	int instance_num;
};

int Ball::instance_counter = 0;

#endif