package hack_parallel
Parallel and shared memory library
Install
Dune Dependency
Authors
Maintainers
Sources
1.0.0.tar.gz
sha256=4ebcdd0c0b23735228d13bbf401799174771a747a5aeb4f35b64dcfc68079e29
md5=26aff6c969020c1d2f588c574dc7d08a
doc/hack_parallel.hack_core/Hack_result/index.html
Module Hack_result
Result
is often used to handle error messages.
'a
is a function's expected return type, and 'b
is often an error message string.
let ric_of_ticker = function
| "IBM" -> Ok "IBM.N"
| "MSFT" -> Ok "MSFT.OQ"
| "AA" -> Ok "AA.N"
| "CSCO" -> Ok "CSCO.OQ"
| _ as ticker -> Error (sprintf "can't find ric of %s" ticker)
The return type of ric_of_ticker could be string option
, but (string, string) Result.t
gives more control over the error message.
include Hack_monad.S2 with type ('a, 'err) t := ('a, 'err) t
module Monad_infix : Hack_monad.Infix2 with type ('a, 'd) t := ('a, 'd) t
val return : 'a -> ('a, _) t
val fail : 'err -> (_, 'err) t
e.g. failf "Couldn't find bloogle %s" (Bloogle.to_string b)
val is_ok : (_, _) t -> bool
val is_error : (_, _) t -> bool
val ok : ('ok, _) t -> 'ok option
val error : (_, 'err) t -> 'err option
val of_option : 'ok option -> error:'err -> ('ok, 'err) t
val iter : ('ok, _) t -> f:('ok -> unit) -> unit
val iter_error : (_, 'err) t -> f:('err -> unit) -> unit
val ok_fst : ('ok, 'err) t -> [ `Fst of 'ok | `Snd of 'err ]
ok_fst
is useful with List.partition_map
. Continuing the above example:
let rics, errors = List.partition_map ~f:Result.ok_fst
(List.map ~f:ric_of_ticker ["AA"; "F"; "CSCO"; "AAPL"])
val ok_if_true : bool -> error:'err -> (unit, 'err) t
val try_with : (unit -> 'a) -> ('a, exn) t
val ok_exn : ('ok, exn) t -> 'ok
ok_exn t
returns x
if t = Ok x
, and raises exn
if t = Error exn
val ok_or_failwith : ('ok, string) t -> 'ok
val ok_unit : (unit, _) t
ok_unit = Ok ()
, used to avoid allocation as a performance hack
module Export : sig ... end
module Stable : sig ... end
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