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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
type 'a t = 'a list ref
type ('a,'b) search = [ `Stop of 'b | `Cont of 'a ]
let create () = ref []
let push x l = l := x :: !l
let pop l = match !l with [] -> raise Stack.Empty | x::xs -> l := xs; x
let top l = match !l with [] -> raise Stack.Empty | x::_ -> x
let find f i l =
let rec aux i = function
| [] -> raise Not_found
| x::xs -> match f i x with `Stop x -> x | `Cont i -> aux i xs in
aux i !l
let is_empty l = match !l with [] -> true | _ -> false
let iter f l = List.iter f !l
let clear l = l := []
let length l = List.length !l
let to_list l = !l
|
