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(***********************************************************************)
(*                                                                     *)
(*                           Objective Caml                            *)
(*                                                                     *)
(*            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 Library General Public License, with    *)
(*  the special exception on linking described in file ../LICENSE.     *)
(*                                                                     *)
(***********************************************************************)

(* $Id: stack.mli 7164 2005-10-25 18:34:07Z doligez $ *)

(** Last-in first-out stacks.

   This module implements stacks (LIFOs), with in-place modification.
*)

type 'a t
(** The type of stacks containing elements of type ['a]. *)

exception Empty
(** Raised when {!Stack.pop} or {!Stack.top} is applied to an empty stack. *)


val create : unit -> 'a t
(** Return a new stack, initially empty. *)

val push : 'a -> 'a t -> unit
(** [push x s] adds the element [x] at the top of stack [s]. *)

val pop : 'a t -> 'a
(** [pop s] removes and returns the topmost element in stack [s],
   or raises [Empty] if the stack is empty. *)

val top : 'a t -> 'a
(** [top s] returns the topmost element in stack [s],
   or raises [Empty] if the stack is empty. *)

val clear : 'a t -> unit
(** Discard all elements from a stack. *)

val copy : 'a t -> 'a t
(** Return a copy of the given stack. *)

val is_empty : 'a t -> bool
(** Return [true] if the given stack is empty, [false] otherwise. *)

val length : 'a t -> int
(** Return the number of elements in a stack. *)

val iter : ('a -> unit) -> 'a t -> unit
(** [iter f s] applies [f] in turn to all elements of [s],
   from the element at the top of the stack to the element at the
   bottom of the stack. The stack itself is unchanged. *)