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

(*i $Id$ i*)

(*i*)
open Names
open Term
open Sign
(*i*)

(* The type of mappings for existential variables.
   The keys are integers and the associated information is a record
   containing the type of the evar ([evar_concl]), the context under which 
   it was introduced ([evar_hyps]) and its definition ([evar_body]). 
   [evar_info] is used to add any other kind of information. *)

type evar = int

val new_evar : unit -> evar

type evar_body =
  | Evar_empty 
  | Evar_defined of constr

type 'a evar_info = {
  evar_concl : constr;
  evar_hyps : named_context;
  evar_body : evar_body;
  evar_info : 'a option }

type 'a evar_map

val empty : 'a evar_map

val add : 'a evar_map -> evar -> 'a evar_info -> 'a evar_map

val dom : 'a evar_map -> evar list
val map : 'a evar_map -> evar -> 'a evar_info
val rmv : 'a evar_map -> evar -> 'a evar_map
val remap : 'a evar_map -> evar -> 'a evar_info -> 'a evar_map
val in_dom : 'a evar_map -> evar -> bool
val to_list : 'a evar_map -> (evar * 'a evar_info) list

val define : 'a evar_map -> evar -> constr -> 'a evar_map

val non_instantiated : 'a evar_map -> (evar * 'a evar_info) list
val is_evar : 'a evar_map -> evar -> bool

val is_defined : 'a evar_map -> evar -> bool

val evar_body : 'a evar_info -> evar_body

val id_of_existential : evar -> identifier