module M = Map.Make(String)

type t = int M.t

Type t is the type of maps from string's to int's. Or alternatively write a
function that assumes 'a is some specific type:

# let f m = M.fold (fun _ x y -> x + y) m 0;;
val f : int M.t -> int = <fun>


On Mon, Sep 20, 2010 at 10:35 AM, Dumitru Potop-Butucaru <
dumitru.potop_butucaru@inria.fr> wrote:

>
> Hello,
>
> I'm certain most users here will consider the question trivially simple,
> but I browsed the documentation without finding a solution.
>
> The question is quite general: Given a polymorphic definition like
> Map.Make(X), where
> X is some module, how can I specialize its 'a type parameter, e.g. by
> setting it to Y, so that
> I have maps from X to Y ?
>
> Yours,
> Jacky Potop
>
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