Via_contramap_fst_and_map_snd_and_closed.Req
type ('a, 'b) t
The type held by the Closed Profunctor.
Closed Profunctor
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 closed : ('a, 'b) t -> ('c -> 'a, 'c -> 'b) t
Act on the input type of a function.