Question

I have a Bullet class that has a function draw(). It want to pass in a static member(object of a SDL_surface class) to this function but not sure how to do it correctly.
my classes :

class AllyBullet: public Bullet
{

        public:

        static SDL_Surface *sprite;
};

class EnemyBullet: public Bullet
{

    public:

        static SDL_Surface *sprite;
};

void Bullet::Draw(SDL_Surface *screen)
{
    DrawSprite(screen,sprite,posX,posY);
}

Bullet does not have a sprite member. How can i write it so that it will know its for the classes that inherit it?

Answer 1

You can make the sprite virtual. Something like this:

struct Bullet
{
   virtual Sprite getSprite() const;
   void Draw(SDL_Surface * screen)
   {
      DrawSprite(screen, getSprite(), posX, posY);
   }
   // ...
};

struct  AllyBullet : public Bullet
{
   static Sprite s;
   virtual Sprite getSprite() const { return s; }
   // ... 
};