(************************************************************************) (* * The Rocq Prover / The Rocq Development Team *) (* v * Copyright INRIA, CNRS and contributors *) (* <O___,, * (see version control and CREDITS file for authors & dates) *) (* \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) *) (************************************************************************)
(** {5 Purely functional streams}
Contrarily to OCaml module [Stream], these are meant to be used purely functionally. This implies in particular that accessing an element does not
discard it. *)
type +'a t (** Type of pure streams. *)
type'a node =
| Nil
| Cons of'a * 'a t (** View type to decompose and build streams. *)
(** {6 Constructors} *)
val empty : 'a t (** The empty stream. *)
val cons : 'a -> 'a t -> 'a t (** Append an element in front of a stream. *)
val thunk : (unit -> 'a node) -> 'a t (** Internalize the laziness of a stream. *)
(** {6 Destructors} *)
val is_empty : 'a t -> bool (** Whethere a stream is empty. *)
val peek : 'a t -> 'a node (** Return the head and the tail of a stream, if any. *)
(** {6 Standard operations}
All stream-returning functions are lazy. The other ones are eager. *)
valapp : 'a t -> 'a t -> 'a t (** Append two streams. Not tail-rec. *)
valmap : ('a -> 'b) -> 'a t -> 'b t (** Mapping of streams. Not tail-rec. *)
val iter : ('a -> unit) -> 'a t -> unit (** Iteration over streams. *)
val fold : ('a -> 'b -> 'a) -> 'a -> 'b t -> 'a (** Fold over streams. *)
val concat : 'a t t -> 'a t (** Appends recursively a stream of streams. *)
val map_filter : ('a -> 'b option) -> 'a t -> 'b t (** Mixing [map] and [filter]. Not tail-rec. *)
val concat_map : ('a -> 'b t) -> 'a t -> 'b t (** [concat_map f l] is the same as [concat (map f l)]. *)
(** {6 Conversions} *)
val of_list : 'a list -> 'a t (** Convert a list into a stream. *)
val to_list : 'a t -> 'a list (** Convert a stream into a list. *)
(** {6 Other}*)
val force : 'a t -> 'a t (** Forces the whole stream. *)
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