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How can I set a type parameter of Map.Make(X) ?
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Date: -- (:)
From: Ashish Agarwal <agarwal1975@g...>
Subject: Re: [Caml-list] How can I set a type parameter of Map.Make(X) ?
Why do you want to do this? What benefit does it bring that cannot be
achieved by leaving the polymorphic type?

On Mon, Sep 20, 2010 at 1:25 PM, Dumitru Potop-Butucaru <
dumitru.potop_butucaru@inria.fr> wrote:

>
> Actually, I was looking for a way to specialize a whole module,
> not just the associated type (**this** I knew how to do).
> I would like to write something like:
>
>    include module type of Set.Make(String) with 'a= int
>
> Is this possible?
>
> Yours,
> Jacky Potop
>
>
>
>
>
> On 20/09/2010 16:57, Ashish Agarwal wrote:
>
>> 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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>
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