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From: Hubert Canon <canon@poly.polytechnique.fr>
To: caml-list@margaux.inria.fr
Subject: Fonction polymorphe
Date: Wed, 24 Jan 1996 19:47:22 +0100 (MET)	[thread overview]
Message-ID: <199601241847.TAA02621@poly.polytechnique.fr> (raw)


Un bug probable de caml-light : j'ai une fonction qui devrait etre
polymorphe, mais elle change de type au premier appel :

Avec caml light 7beta2 (le code n'est pas de moi) :

#let permutations =
  let rec permut fixe = fun
    [] [] -> [fixe] |
    debut [] -> [] |
    debut (x :: suite) -> (permut (fixe @ [x]) []
                                  (debut @ suite)) @
                          (permut fixe (debut @ [x]) suite)
  in
  permut [] [];;

- : permutations : '_a list -> '_a list list = <fun>

#permutations ["3";"456";""];;
- : string list list =
[["3"; "456"; ""]; ["3"; ""; "456"]; ["456"; "3"; ""]; ["456"; ""; "3"];
 [""; "3"; "456"]; [""; "456"; "3"]]

#permutations;;
- : string list -> string list list = <fun>

#permutations [1;2];;
Entrée interactive:
>permutations [1;2];;<EOF>
>             ^^^^^^^^^^
Cette expression est de type int list,
mais est utilisée avec le type string list.


-- 
-------------------------- Hubert Canon --------------------------
        Email : canon@poly.polytechnique.fr
        WWW   : http://www.polytechnique.fr/poly/~canon/
------------------------------------------------------------------





             reply	other threads:[~1996-02-01 13:38 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
1996-01-24 18:47 Hubert Canon [this message]
1996-02-01 14:03 ` Pierre Weis
1996-02-01 14:03 ` Eric Hassold

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