void *Drone_new(size_t size, Drone proto, int *id)
{
// setup the default functions in case they aren't set
if(!proto.init) proto.init = Drone_init;
if(!proto.boot) proto.boot = Drone_boot;
if(!proto.stand_by) proto.stand_by = Drone_stand_by;
if(!proto.navigate) proto.navigate = Drone_navigate;
if(!proto.pick_up) proto.pick_up = Drone_pick_up;
if(!proto.lift_off) proto.lift_off = Drone_lift_off;
if(!proto.deliver) proto.deliver= Drone_deliver;
if(!proto.return_home) proto.return_home = Drone_return_home;
if(!proto.land) proto.land = Drone_land;
if(!proto.state) proto.state = Drone_state;
// this seems weird, but we can make a struct of one size,
// then point a different pointer at it to "cast" it
Drone *el = calloc(1, size);
*el = proto;
// copy the id over
el->id = *id;
el->curr_state = 0;
el->busy = 0;
el->curr_x = 0;
el->curr_y = 0;
// initialize it with whatever init we were given
if(!el->init(el)) {
// looks like it didn't initialize properly
el->destroy(el);
return NULL;
} else {
// all done, we made an object of any type
return el;
}
}
