struct CTile {
     bool solid;
     SDL_Surface *img;
}

class CLevel {
     public:
          bool collision(int x, int y) {
               return tile[x][y].solid;
          }
     private:
          CTile tile[100][100];
}

class CPlayer {
     public:
          bool colx(int x, int y);
     private:
          // misc stuff down here

}

class Level{// stuffvoid cool();};Level mylevel;class Player{//stuffvoid do_stuff(){   mylevel.cool();}};

struct CTile {	bool solid;	SDL_Surface *img;};class CLevel {	public:		bool collision(int x, int y) {			return tile[x + ((y-1) * mWidth)].solid;		}		void loadmap(char *file);	private:		CTile *tile;};class CPlayer {	public:		bool colx(int x, int y, int &tilecoordy);		bool coly(int x, int y, int &tilecoordx);};// globalsCEngine game;     // player is defined inside CEngineCLevel level;// mainint main(int argc, char *argv[]) {	game.init(640, 480, 0);		game.loop();	return 0;}// functions and methodsbool CPlayer::colx(int x, int y, int &tilecoordy) {	// blah blah	while(xpixels <= testend) {		if(level.collision(tilecoordx, tilecoordy))			return true;                // more stuff	}	return false;}