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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: rtree.mli,v 1.2.8.1 2004/07/16 19:30:31 herbelin Exp $ i*)
(* Type of regular tree with nodes labelled by values of type 'a *)
type 'a t
(* Building trees *)
(* build a recursive call *)
val mk_param : int -> 'a t
(* build a node given a label and the vector of sons *)
val mk_node : 'a -> 'a t array -> 'a t
(* build mutually dependent trees *)
val mk_rec : 'a t array -> 'a t array
(* [lift k t] increases of [k] the free parameters of [t]. Needed
to avoid captures when a tree appears under mk_rec *)
val lift : int -> 'a t -> 'a t
val map : ('a -> 'b) -> 'a t -> 'b t
(* [(smartmap f t) == t] if [(f a) ==a ] for all nodes *)
val smartmap : ('a -> 'a) -> 'a t -> 'a t
(* Destructors (recursive calls are expanded) *)
val dest_param : 'a t -> int
val dest_node : 'a t -> 'a * 'a t array
(* Tells if a tree has an infinite branch *)
val is_infinite : 'a t -> bool
(* A rather simple minded pretty-printer *)
val pp_tree : ('a -> Pp.std_ppcmds) -> 'a t -> Pp.std_ppcmds
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