(*i $Id$ i*)

(* Bounded stacks. If the depth is [None], then there is no depth limit. *)

type 'a t

val create : int option -> 'a t
val set_depth : 'a t -> int option -> unit
val push : 'a t -> 'a -> unit
val app_push : 'a t -> ('a -> 'a) -> unit
val app_repl : 'a t -> ('a -> 'a) -> unit
val pop : 'a t -> 'a option
val top : 'a t -> 'a option
val is_empty : 'a t -> bool
val depth : 'a t -> int