(**************************************************************************)
(*                                                                        *)
(*  Menhir                                                                *)
(*                                                                        *)
(*  François Pottier, INRIA Rocquencourt                                  *)
(*  Yann Régis-Gianas, PPS, Université Paris Diderot                      *)
(*                                                                        *)
(*  Copyright 2005-2008 Institut National de Recherche en Informatique    *)
(*  et en Automatique. All rights reserved. This file is distributed      *)
(*  under the terms of the Q Public License version 1.0, with the change  *)
(*  described in file LICENSE.                                            *)
(*                                                                        *)
(**************************************************************************)

let map f = function
  | None ->
      None
  | Some x ->
      Some (f x)

let iter f o =
  match o with
  | None ->
      ()
  | Some x ->
      f x

let fold f o accu =
  match o with
  | None ->
      accu
  | Some x ->
      f x accu