i = vec_len (hm->bool_ref_by_sw_if_index);
vec_free (hm->bool_ref_by_sw_if_index);
vec_validate_init_empty (hm->bool_ref_by_sw_if_index, i, ~0);
i = vec_len (hm->bool_ref_by_sw_if_index);
vec_free (hm->bool_ref_by_sw_if_index);
vec_validate_init_empty (hm->bool_ref_by_sw_if_index, i, ~0);