(**************************************************************************)
(*                                                                        *)
(*                                 OCaml                                  *)
(*                                                                        *)
(*             Xavier Leroy, projet Cristal, INRIA Rocquencourt           *)
(*                                                                        *)
(*   Copyright 1996 Institut National de Recherche en Informatique et     *)
(*     en Automatique.                                                    *)
(*                                                                        *)
(*   All rights reserved.  This file is distributed under the terms of    *)
(*   the GNU Lesser General Public License version 2.1, with the          *)
(*   special exception on linking described in the file LICENSE.          *)
(*                                                                        *)
(**************************************************************************)

(* Identifiers (unique names) *)

type t

include Identifiable.S with type t := t
(* Notes:
   - [equal] compares identifiers by name
   - [compare x y] is 0 if [same x y] is true.
   - [compare] compares identifiers by binding location
*)


val create: string -> t
val create_persistent: string -> t
val create_predef_exn: string -> t
val rename: t -> t
val name: t -> string
val with_name: t -> string -> t
val unique_name: t -> string
val unique_toplevel_name: t -> string
val persistent: t -> bool
val same: t -> t -> bool
        (* Compare identifiers by binding location.
           Two identifiers are the same either if they are both
           non-persistent and have been created by the same call to
           [new], or if they are both persistent and have the same
           name. *)
val compare: t -> t -> int
val hide: t -> t
        (* Return an identifier with same name as the given identifier,
           but stamp different from any stamp returned by new.
           When put in a 'a tbl, this identifier can only be looked
           up by name. *)

val global: t -> bool
val is_predef_exn: t -> bool

val binding_time: t -> int
val current_time: unit -> int
val set_current_time: int -> unit
val reinit: unit -> unit

type 'a tbl
        (* Association tables from identifiers to type 'a. *)

val empty: 'a tbl
val add: t -> 'a -> 'a tbl -> 'a tbl
val find_same: t -> 'a tbl -> 'a
val find_name: string -> 'a tbl -> t * 'a
val find_all: string -> 'a tbl -> (t * 'a) list
val fold_name: (t -> 'a -> 'b -> 'b) -> 'a tbl -> 'b -> 'b
val fold_all: (t -> 'a -> 'b -> 'b) -> 'a tbl -> 'b -> 'b
val iter: (t -> 'a -> unit) -> 'a tbl -> unit


(* Idents for sharing keys *)

val make_key_generator : unit -> (t -> t)
