From: Gerd Stolpmann <info@gerd-stolpmann.de>
To: Christian Stork <cstork@ics.uci.edu>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Monomorphism restriction in classes
Date: Fri, 17 Feb 2006 22:53:44 +0100 [thread overview]
Message-ID: <1140213224.10403.33.camel@localhost.localdomain> (raw)
In-Reply-To: <20060217210920.GA27593@anthony.ics.uci.edu>
Am Freitag, den 17.02.2006, 13:09 -0800 schrieb Christian Stork:
> So, what's the best work-around for this problem?
>
> class c (len : 'a list -> int) =
> object
> method str_len (l: string list) = len l
> method int_len (l: int list) = len l
> end
>
type len_t = { len : 'a . 'a list -> int}
class c (len :len_t) =
object
method str_len (l:string list) = len.len l
method int_len (l: int list) = len.len l
end
I don't know why the 'a.t syntax is only allowed for records and
methods, and why one cannot say
class c (len : 'a . 'a list -> int) = ...
Gerd
> $ ocamlc monoRestForClasses.ml
> File "monoRestForClasses.ml", line 7, characters 40-41:
> This expression has type int list but is here used with type string list
>
> Thanks,
> Chris
>
--
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Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany
gerd@gerd-stolpmann.de http://www.gerd-stolpmann.de
Phone: +49-6151-153855 Fax: +49-6151-997714
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prev parent reply other threads:[~2006-02-17 21:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-17 21:09 Christian Stork
2006-02-17 21:53 ` Gerd Stolpmann [this message]
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