+ Portable* portable = dynamic_cast<Portable*> (object);
+ if(portable != NULL) {
+ portables.erase(std::find(portables.begin(), portables.end(), portable));
+ }
+ Bullet* bullet = dynamic_cast<Bullet*> (object);
+ if(bullet != NULL) {
+ bullets.erase(std::find(bullets.begin(), bullets.end(), bullet));
+ }
+ MovingObject* moving_object = dynamic_cast<MovingObject*> (object);
+ if(moving_object != NULL) {
+ moving_objects.erase(
+ std::find(moving_objects.begin(), moving_objects.end(), moving_object));
+ }
+