Choice (preface.Preface_stdlib.Fun.Choice)

Type

type ('a, 'b) t = ('a, 'b) t

The type held by the Choice.

val dimap : ('a -> 'b) -> ('c -> 'd) -> ('b, 'c) t -> ('a, 'd) t

val contramap_fst : ('a -> 'b) -> ('b, 'c) t -> ('a, 'c) t

Contramapping over the first argument.

val map_snd : ('b -> 'c) -> ('a, 'b) t -> ('a, 'c) t

Mapping over the second argument.

val left : ('a, 'b) t -> (('a, 'c) Stdlib.Either.t, ('b, 'c) Stdlib.Either.t) t

Act on the left parameter of the sum.

val right : 
  ('a, 'b) t ->
  (('c, 'a) Stdlib.Either.t, ('c, 'b) Stdlib.Either.t) t

Act on the right parameter of the sum.