Contravariant.Core
module Req : Preface_specs.Contravariant.WITH_CONTRAMAP
type 'a t = 'a Req.t
The type held by the Contravariant Functor.
Contravariant Functor
val contramap : ('a -> 'b) -> 'b t -> 'a t
Mapping over from 'a to 'b over 'b t to 'a t.
'a
'b
'b t
'a t