- Note_column *n_l = n?(Note_column*)n->item():0;
- rest_l_arr_.substitute ((Note_column*)o_l, n_l);
- ncol_l_arr_.substitute ((Note_column*)o_l, n_l);
+ Note_column *n_l = n?dynamic_cast<Note_column *> (n):0;
+ rest_l_arr_.substitute (onl, n_l);
+ ncol_l_arr_.substitute (onl, n_l);