Module Deferred.Or_error

type 'a t = 'a Core.Or_error.t t
include Core.Monad.S with type 'a t := 'a t
val return : 'a 'i 'p 'q. 'a -> 'a t

Convert a value to a t.

val map : 'a 'b 'i 'j 'p 'q. 'a t -> f:('a -> 'b) -> 'b t

Transforms the contents of a t.

val bind : 'a 'b 'i 'j 'k 'p 'q. 'a t -> f:('a -> 'b t) -> 'b t

Sequences computations. bind t ~f computes f v for value(s) v in t. Well-behaved monads satisfy these "laws" (where ( >>= ) is the infix bind operator):

  • map t ~f is equivalent to bind t ~f:(fun x -> return (f x))
  • return x >>= f is equivalent to f x
  • t >>= return is equivalent to t
  • (t >>= f) >>= g is equivalent to t >>= fun x -> f x >>= g
val join : 'a 'i 'j 'k 'p 'q. 'a t t -> 'a t

Combines nested t into just one layer. Equivalent to bind t ~f:Fn.id.

val ignore_m : 'a 'i 'j 'p 'q. 'a t -> unit t

Ignores contained values of t. Equivalent to map t ~f:ignore.

val all : 'a 'i 'p 'q. 'a t list -> 'a list t

Combines a list of t.

val all_unit : 'i 'p 'q. unit t list -> unit t

Combines a list of t whose contents are unimportant.

val (>>=) : 'a 'b 'i 'j 'k 'p 'q. 'a t -> ('a -> 'b t) -> 'b t

Infix bind.

val (>>|) : 'a 'b 'i 'j 'p 'q. 'a t -> ('a -> 'b) -> 'b t

Infix map.

module Monad_infix : sig ... end
module Let_syntax : sig ... end
val fail : Core.Error.t -> _ t
val ok_unit : unit t
val ok_exn : 'a t -> 'a t
val of_exn : ?backtrace:[ `Get | `This of string ] -> exn -> _ t
val of_exn_result : ?backtrace:[ `Get | `This of string ] -> ('a, exn) Core.Result.t t -> 'a t
val error : string -> 'a -> ('a -> Core.Sexp.t) -> _ t
val error_s : Core.Sexp.t -> _ t
val error_string : string -> _ t
val errorf : ('a, unit, string, _ t) Core.format4 -> 'a
val tag : 'a t -> tag:string -> 'a t
val tag_s : 'a t -> tag:Core.Sexp.t -> 'a t
val tag_s_lazy : 'a t -> tag:Core.Sexp.t Core.Lazy.t -> 'a t
val tag_arg : 'a t -> string -> 'b -> ('b -> Core.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 ] -> ?rest:[ `Log | `Raise | `Call of exn -> unit ] -> 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 ] -> ?rest:[ `Log | `Raise | `Call of exn -> unit ] -> 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 Array : Async_kernel.Monad_sequence.S with type 'a monad := 'a t with type 'a t := 'a array
module Iarray : Async_kernel.Monad_sequence.S with type 'a monad := 'a t with type 'a t := 'a iarray
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