From: Eric Hassold <Eric.Hassold@sophia.inria.fr>
To: Hubert Canon <canon@poly.polytechnique.fr>
Cc: caml-list@margaux.inria.fr
Subject: Re: Fonction polymorphe
Date: Thu, 01 Feb 1996 15:03:48 +0100 [thread overview]
Message-ID: <199602011403.PAA04962@medee.inria.fr> (raw)
In-Reply-To: Your message of "Wed, 24 Jan 1996 19:47:22 +0100." <199601241847.TAA02621@poly.polytechnique.fr>
> Un bug probable de caml-light
Sauf erreur de ma part, ce n'est pas un bug, mais une fonctionnalite
introduite dans CL 0.7, qui permet l'affectation dynamique d'un type lors
de la 1ere evaluation ( pour les types representes par '_a au lieu de 'a).
Pour conserver le typage polymorphe, il suffit d'ecrire explicitement
les parametres de la fonction, c-a-d :
let permutations l =
let rec permut fixe = fun
[] [] -> [fixe] |
debut [] -> [] |
debut (x :: suite) -> (permut (fixe @ [x]) []
(debut @ suite)) @
(permut fixe (debut @ [x]) suite)
in
permut [] [] l;;
- : permutations : '_a list -> '_a list list = <fun>
et tout marche.
prev parent reply other threads:[~1996-02-01 15:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-01-24 18:47 Hubert Canon
1996-02-01 14:03 ` Pierre Weis
1996-02-01 14:03 ` Eric Hassold [this message]
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