package preface

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package preface
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Minimal definition using contramap, divide, conquer, lose and choose.

include WITH_LOSE_AND_CHOOSE
type 'a t

The type held by the Decidable.

val lose : ('a -> Preface_core.Void.t) -> 'a t

Since Void.t is identity for Either.t, lose act as an identity for Decidable.

val choose : ('a -> ('b, 'c) Preface_core.Shims.Either.t) -> 'b t -> 'c t -> 'a t

choose f x y says that if f can handle either x or y it can handle the result of the function.

include Divisible.WITH_CONTRAMAP_AND_DIVIDE_AND_CONQUER with type 'a t := 'a t
include Divisible.WITH_DIVIDE_AND_CONQUER with type 'a t := 'a t
val divide : ('a -> 'b * 'c) -> 'b t -> 'c t -> 'a t

The contravariant version of apply from Applicative.

val conquer : 'a t

Provide and empty value.

include Contravariant.WITH_CONTRAMAP with type 'a t := 'a t
val contramap : ('a -> 'b) -> 'b t -> 'a t

Mapping over from 'a to 'b over 'b t to 'a t.