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(**************************************************************************) (* *) (* Copyright (C) Jean-Christophe Filliatre *) (* *) (* This software is free software; you can redistribute it and/or *) (* modify it under the terms of the GNU Library General Public *) (* License version 2.1, with the special exception on linking *) (* described in file LICENSE. *) (* *) (* This software 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. *) (* *) (**************************************************************************) (* A persistent union-find data structure. The datatype [t] maintains a partition of the set [0,1,...,n-1], where [n] is the value passed to [create]. *) type t val create : int -> t val find : t -> int -> int val union : t -> int -> int -> t