package async_kernel

  1. Overview
  2. Docs
package async_kernel
Legend:
Library
Module
Module type
Parameter
Class
Class type
type 'a t = 'a Core_kernel.Or_error.t t
include Core_kernel.Monad.S with type 'a t := 'a t
val (>>=) : 'a t -> ('a -> 'b t) -> 'b t

t >>= f returns a computation that sequences the computations represented by two monad elements. The resulting computation first does t to yield a value v, and then runs the computation returned by f v.

val (>>|) : 'a t -> ('a -> 'b) -> 'b t

t >>| f is t >>= (fun a -> return (f a)).

module Monad_infix : sig ... end
val bind : 'a t -> f:('a -> 'b t) -> 'b t

bind t ~f = t >>= f

val return : 'a -> 'a t

return v returns the (trivial) computation that returns v.

val map : 'a t -> f:('a -> 'b) -> 'b t

map t ~f is t >>| f.

val join : 'a t t -> 'a t

join t is t >>= (fun t' -> t').

val ignore_m : 'a t -> unit t

ignore_m t is map t ~f:(fun _ -> ()). ignore_m used to be called ignore, but we decided that was a bad name, because it shadowed the widely used Caml.ignore. Some monads still do let ignore = ignore_m for historical reasons.

val all : 'a t list -> 'a list t
val all_unit : unit t list -> unit t

Like all, but ensures that every monadic value in the list produces a unit value, all of which are discarded rather than being collected into a list.

module Let_syntax : sig ... end

These are convenient to have in scope when programming with a monad:

val fail : Core_kernel.Error.t -> _ t
val ok_unit : unit t
val ignore : _ t -> unit t
  • deprecated [since 2019-06] Use [ignore_m] instead
val ok_exn : 'a t -> 'a t
val of_exn : exn -> _ t
val of_exn_result : ('a, exn) Core_kernel.Result.t t -> 'a t
val error : string -> 'a -> ('a -> Core_kernel.Sexp.t) -> _ t
val error_s : Core_kernel.Sexp.t -> _ t
val error_string : string -> _ t
val errorf : ('a, unit, string, _ t) Core_kernel.format4 -> 'a
val tag : 'a t -> tag:string -> 'a t
val tag_s : 'a t -> tag:Core_kernel.Sexp.t -> 'a t
val tag_arg : 'a t -> string -> 'b -> ('b -> Core_kernel.Sexp.t) -> 'a t
val unimplemented : string -> _ t
val find_map_ok : 'a list -> f:('a -> 'b t) -> 'b t
val try_with : ?extract_exn:bool -> ?run:[ `Now | `Schedule ] -> ?here:Lexing.position -> ?name:string -> (unit -> 'a t) -> 'a t

Note that try_with f is eager only in the Ok case.

val try_with_join : ?extract_exn:bool -> ?run:[ `Now | `Schedule ] -> ?here:Lexing.position -> ?name:string -> (unit -> 'a t) -> 'a t

Note that try_with_join f is eager only when no exception is raised by f.

val combine_errors : 'a t list -> 'a list t
val combine_errors_unit : unit t list -> unit t
val filter_ok_at_least_one : 'a t list -> 'a list t
module List : Async_kernel.Monad_sequence.S with type 'a monad := 'a t with type 'a t := 'a list
val repeat_until_finished : 'state -> ('state -> [ `Repeat of 'state | `Finished of 'result ] t) -> 'result t
OCaml

Innovation. Community. Security.

GitHub Discord Twitter Peertube RSS
About
Changelog Releases Industrial Users Academic Users Why OCaml
Ecosystem
Packages Community Events OCaml Planet Jobs
Resources
Install OCaml Get Started Platform Tools Language Manual Standard Library API Books Exercises Papers OCaml Playground Logo
Policies
Carbon Footprint Governance Privacy Code of Conduct