(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

open Term
open Pattern
open Names

(** Discrimination nets with bounded depth. *)

(** This module registers actions (typically tactics) mapped to patterns *)

(** Patterns are stocked linearly as the list of its node in prefix
order in such a way patterns having the same prefix have this common
prefix shared and the seek for the action associated to the patterns
that a term matches are found in time proportional to the maximal
number of nodes of the patterns matching the term. The [transparent_state]
indicates which constants and variables can be considered as rigid.
These dnets are able to cope with existential variables as well, which match
[Everything]. *)

module Make :
  functor (Z : Map.OrderedType) ->
sig
  type t

  val create : unit ->  t

  val add : transparent_state option -> t -> (constr_pattern * Z.t) -> t
  val rmv : transparent_state option -> t -> (constr_pattern * Z.t) -> t

  val lookup : transparent_state option -> t -> constr -> Z.t list
  val app : (Z.t -> unit) -> t -> unit
end

val dnet_depth : int ref
