package preface

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Module Choice.Composition

Parameters

Signature

type (_, _) t =
  1. | Composed : (('a, 'b) F.t * ('b, 'c) G.t) -> ('a, 'c) t
include Preface_specs.CHOICE with type ('a, 'b) t := ('a, 'b) t

Type

Functions

Type

Functions

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) Either.t, ('b, 'c) Either.t) t

Act on the left parameter of the sum.

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

Act on the right parameter of the sum.