package travesty
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doc/travesty.base_exts/Travesty_base_exts/Option/With_errors/index.html
Module Option.With_errorsSource
With_errors is shorthand for On_monad (Or_error).
include Travesty.Traversable.Generic_on_monad
with type 'a t := 'a t
and type 'a elt := 'a
with module M := Base.Or_error
include Travesty.Traversable.Basic_generic_on_monad
with type 'a t := 'a t
with type 'a elt := 'a
with module M := Base.Or_error
Generic refers to the container type as 'a t, and the element type as 'a elt; substitute t/elt (arity-0) or 'a t/'a (arity-1) accordingly below.
include Travesty.Types_intf.Generic
with type 'a t := 'a t
with type 'a elt := 'a
map_m c ~f maps f over every t in c, threading through monadic state.
Example:
(* Travesty_base_exts.List adds monadic traversals to a list;
With_errors (in S1_container) implements them on the On_error
monad. *)
let f x =
Or_error.(if 0 < x then error_string "negative!" else ok x)
in
List.With_errors.map_m integers ~fval fold_map_m :
'a t ->
f:('acc -> 'a -> ('acc * 'b) Base.Or_error.t) ->
init:'acc ->
('acc * 'b t) Base.Or_error.tfold_map_m c ~f ~init folds f monadically over every t in c, threading through an accumulator with initial value init.
val fold_m :
'a t ->
init:'acc ->
f:('acc -> 'a -> 'acc Base.Or_error.t) ->
'acc Base.Or_error.tfold_m x ~init ~f folds the monadic computation f over x, starting with initial value init, and returning the final value inside the monadic effect.
iter_m x ~f iterates the monadic computation f over x, returning the final monadic effect.
mapi_m ~f x behaves as mapM, but also supplies f with the index of the element. This index should match the actual position of the element in the container x.
sequence_m x lifts a container of monads x to a monad containing a container, by sequencing the monadic effects from left to right.