From: Ashish Agarwal <agarwal1975@gmail.com>
To: Dumitru Potop-Butucaru <dumitru.potop_butucaru@inria.fr>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] How can I set a type parameter of Map.Make(X) ?
Date: Mon, 20 Sep 2010 13:31:33 -0400 [thread overview]
Message-ID: <AANLkTik3AELa=aKjKSywwG8Eg3kc+QgUpuK6r2npLQqK@mail.gmail.com> (raw)
In-Reply-To: <4C97991F.7030503@inria.fr>
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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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>>>
>>>
>>>
>
> _______________________________________________
> Caml-list mailing list. Subscription management:
> http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list
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>
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next prev parent reply other threads:[~2010-09-20 17:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-20 14:35 Dumitru Potop-Butucaru
2010-09-20 14:57 ` [Caml-list] " Ashish Agarwal
2010-09-20 17:25 ` Dumitru Potop-Butucaru
2010-09-20 17:31 ` Ashish Agarwal [this message]
2010-09-20 17:58 ` Martin Jambon
2010-09-20 19:02 ` Dumitru Potop-Butucaru
2010-09-20 19:32 ` Ashish Agarwal
2010-09-20 19:35 ` code duplication (was Re: [Caml-list] How can I set a type parameter of Map.Make(X) ?) Martin Jambon
2010-09-20 14:59 ` How can I set a type parameter of Map.Make(X) ? Sylvain Le Gall
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