private static void Del_old_pages_not_in_cur( int i, Int_obj_ref tmp_id, Ordered_hash old_regy, Ordered_hash cur_regy, List_adp del_list) { if (i == 0) return; // skip logic for first ctg (which doesn't have a predecessor) int old_len = old_regy.Count(); for (int j = 0; j < old_len; j++) { // if cur is not in new, del it Int_obj_ref old_id = (Int_obj_ref) old_regy.Get_at(j); if (!cur_regy.Has(tmp_id.Val_(old_id.Val()))) // old_itm does not exist in cur_regy del_list.Add( old_id); // remove; EX: (A,B) in old; B only in cur; old should now be (A) only } int del_len = del_list.Count(); for (int j = 0; j < del_len; j++) { Int_obj_ref old_itm = (Int_obj_ref) del_list.Get_at(j); old_regy.Del(tmp_id.Val_(old_itm.Val())); } }