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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