hb_set_copy (const hb_set_t *set)
{
  hb_set_t *copy = hb_set_create ();
  copy->set (*set);
  return copy;
}
hb_set_copy (const hb_set_t *set)
{
  hb_set_t *copy = hb_set_create ();
  copy->set (*set);
  return copy;
}