(*
    ||M||  This file is part of HELM, an Hypertextual, Electronic        
    ||A||  Library of Mathematics, developed at the Computer Science     
    ||T||  Department, University of Bologna, Italy.                     
    ||I||                                                                
    ||T||  HELM is free software; you can redistribute it and/or         
    ||A||  modify it under the terms of the GNU General Public License   
    \   /  version 2 or (at your option) any later version.              
     \ /   This software is distributed as is, NO WARRANTY.              
      V_______________________________________________________________ *)

type context

exception LRefNotFound of (context, Brg.term) Log.item list

type ho_whd_result =
   | Sort of int
   | Abst of Brg.term

val empty_context: context

val push: (context -> 'a) -> context -> Brg.bind -> 'a

val get: (Brg.bind -> 'a) -> context -> int -> 'a

val iter: (unit -> 'a) -> ((unit -> 'a) -> Brg.bind -> 'a) -> context -> 'a

val are_convertible: (bool -> 'a) -> context -> Brg.term -> Brg.term -> 'a

val ho_whd: (context -> ho_whd_result -> 'a) -> context -> Brg.term -> 'a