package lwt

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Promises and event-driven I/O

Install

dune-project

Dependency

github.com Readme MIT License Edit opam file Versions (29)

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Maintainers

Sources

5.5.0.tar.gz

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sha512=8951b94555e930634375816d71815b9d85daad6ffb7dab24864661504d11be26575ab0b237196c54693efa372a9b69cdc1d5068a20a250dc0bbb4a3c03c5fda1

doc/lwt/Lwt_result/index.html

Module `Lwt_result`

Explicit error handling

since 2.6.0

This module provides helpers for values of type ('a, 'b) result Lwt.t. The module is experimental and may change in the future.

type (+'a, +'b) t = ('a, 'b) Result.result Lwt.t

val return : 'a -> ('a, _) t

val fail : 'b -> (_, 'b) t

val lift : ('a, 'b) Result.result -> ('a, 'b) t

val ok : 'a Lwt.t -> ('a, _) t

val catch : 'a Lwt.t -> ('a, exn) t

catch x behaves like return y if x evaluates to y, and like fail e if x raises e

val get_exn : ('a, exn) t -> 'a Lwt.t

get_exn is the opposite of catch: it unwraps the result type, returning the value in case of success, calls Lwt.fail in case of error.

val map : ('a -> 'b) -> ('a, 'e) t -> ('b, 'e) t

val map_err : ('e1 -> 'e2) -> ('a, 'e1) t -> ('a, 'e2) t

val bind : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t

val bind_lwt : ('a, 'e) t -> ('a -> 'b Lwt.t) -> ('b, 'e) t

val bind_lwt_err : ('a, 'e1) t -> ('e1 -> 'e2 Lwt.t) -> ('a, 'e2) t

val bind_result : ('a, 'e) t -> ('a -> ('b, 'e) Result.result) -> ('b, 'e) t

val both : ('a, 'e) t -> ('b, 'e) t -> ('a * 'b, 'e) t

Lwt.both p_1 p_2 returns a promise that is pending until both promises p_1 and p_2 become resolved. If only p_1 is Error e, the promise is resolved with Error e, If only p_2 is Error e, the promise is resolved with Error e, If both p_1 and p_2 resolve with Error _, the promise is resolved with the error that occurred first.

module Infix : sig ... end

module Let_syntax : sig ... end

module Syntax : sig ... end

include module type of Infix

val (>|=) : ('a, 'e) t -> ('a -> 'b) -> ('b, 'e) t

val (>>=) : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t