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open Module_types
type ('a, 'e) t = ('a, 'e) result
let (>>=)
(m: ('a, 'e) t)
(f: 'a -> ('b, 'e) t)
: ('b, 'e) t
=
match m with
| Ok a ->
f a
| Error e ->
Error e
let map (f: 'a -> 'b) (m: ('a, 'e) t): ('b, 'e) t =
match m with
| Ok a ->
Ok (f a)
| Error e ->
Error e
let map_error (f: 'e1 -> 'e2) (m: ('a,'e1) t): ('a, 'e2) t =
match m with
| Ok a ->
Ok a
| Error e ->
Error (f e)
let throw (e: 'e): ('a, 'e) t =
Error e
let catch (m: ('a, 'e) t) (f: 'e -> ('a, 'e) t): ('a, 'e) t =
match m with
| Ok a ->
Ok a
| Error e ->
f e
module Make (Error: ANY) =
struct
type error = Error.t
include
Monad.Of_sig_min (
struct
type 'a t = ('a, error) result
let return (a: 'a): 'a t =
Ok a
let (>>=) = (>>=)
end
)
let throw = throw
let catch = catch
let continue m f g =
match m with
| Ok a ->
f a
| Error e ->
g e
end