From: "Sylvain BOULM'E" <Sylvain.Boulme@lip6.fr>
To: luther@dpt-info.u-strasbg.fr
Cc: caml-list@inria.fr
Subject: Re: Modules, type de modules et type polymorphes.
Date: Wed, 20 Sep 2000 15:45:07 +0200 [thread overview]
Message-ID: <200009201345.PAA06349@rana.lip6.fr> (raw)
In-Reply-To: Your message of "Tue, 19 Sep 2000 14:29:39 +0200." <20000919142939.A3312@lambda.u-strasbg.fr>
> Bonjour, ...
> Hello, ...
>
> quel est le probleme de ceci ?
>
> # module type T_A = sig
> val string_of_a : 'a -> string
> end;;
> module type T_A = sig val string_of_a : 'a -> string end
> # module A : T_A = struct
> let string_of_a = string_of_int
> end;;
> Signature mismatch:
Bonjour,
Le probleme est que dans "T_A", on exige que "string_of_a" soit polymorphe. Or
dans A, tu ne lui fournis qu'une fonction monomorphe !!
Qq'un qui utilise un module A de type T_A a le droit d'ecrire
"A.string_of_a true"
Ce qui provoquerait un segmentation fault avec ton implantation de A...
Je ne sais pas ceux que tu cherches a ecrire, mais qq chose comme ci-dessous
serait peut-etre plus adapte :
module type T_A =
sig type t val string_of_a : t -> string end
module A: (T_A with type t=int) =
struct
type t=int
let string_of_a = string_of_int
end
Sylvain.
--
Tel. prof : 01-44-27-88-35
Page web : http://www-spi.lip6.fr/~boulme/
prev parent reply other threads:[~2000-09-20 19:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-19 12:29 Sven LUTHER
2000-09-19 18:16 ` Markus Mottl
2000-09-20 7:31 ` Jean-Christophe Filliatre
2000-09-20 13:45 ` Sylvain BOULM'E [this message]
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