(* * Copyright (c) 1997-1999 Massachusetts Institute of Technology * Copyright (c) 2003, 2007-11 Matteo Frigo * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * *) type ('a, 'b) elem = | Leaf | Node of int * ('a, 'b) elem * ('a, 'b) elem * ('a * 'b) list val empty : ('a, 'b) elem val lookup : ('a -> int) -> ('a -> 'b -> bool) -> 'a -> ('b, 'c) elem -> 'c option val insert : ('a -> int) -> 'a -> 'c -> ('a, 'c) elem -> ('a, 'c) elem