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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
(** Extended interface for OCaml stacks. *)
type 'a t
exception Empty
(** Alias for Stack.Empty. *)
val create : unit -> 'a t
(** Create an empty stack. *)
val push : 'a -> 'a t -> unit
(** Add an element to a stack. *)
val find : ('a -> bool) -> 'a t -> 'a
(** Find the first element satisfying the predicate.
@raise Not_found it there is none. *)
val is_empty : 'a t -> bool
(** Whether a stack is empty. *)
val iter : ('a -> unit) -> 'a t -> unit
(** Iterate a function over elements, from the last added one. *)
val clear : 'a t -> unit
(** Empty a stack. *)
val length : 'a t -> int
(** Length of a stack. *)
val pop : 'a t -> 'a
(** Remove and returns the first element of the stack.
@raise Empty if empty. *)
val top : 'a t -> 'a
(** Remove the first element of the stack without modifying it.
@raise Empty if empty. *)
val to_list : 'a t -> 'a list
(** Convert to a list. *)
val find_map : ('a -> 'b option) -> 'a t -> 'b
(** Find the first element that returns [Some _].
@raise Not_found it there is none. *)
val fold_until : ('c -> 'a -> 'c CSig.until) -> 'c -> 'a t -> 'c
(** Like CList.fold_left_until.
The stack is traversed from the top and is not altered. *)
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