class RoomCoordinate
{
public:
  int x, y, z;
  RoomCoordinate () : x (0), y (0), z (0) { }
  RoomCoordinate (int x, int y, int z) : x (x), y (y), z (z) { }
  RoomCoordinate (const RoomCoordinate& rc) : x (rc.x), y (rc.y), z (rc.z) { }
# ifdef CS_DEBUG
  static bool IsValid (int x, int y, int z)
  {
    return (x >= 0 && x < MAZE_DIMENSION &&
	    y >= 0 && y < MAZE_DIMENSION &&
	    z >= 0 && z < MAZE_DIMENSION);
  }
  bool IsValid () const
  {
    return IsValid (x, y, z);
  }
# endif
};