From: "Jean-Denis Eiden" <jean-denis.eiden@orange.fr>
To: <caml-list@inria.fr>
Subject: [Caml-list] listes qui bouclent
Date: Sun, 7 Sep 2014 11:31:45 +0200 [thread overview]
Message-ID: <91F16B653D20446DA42F7B673FD5509D@PCdejd> (raw)
Bonjour à tous,
CaML light permet la construction suivante :
#let rec liste = 0::1::2::3::liste;;
liste : int list =
[0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0;
1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1;
2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2;
3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2; 3; 0; 1; 2;
...]
Cela étant, j'aimerais pouvoir faire la même chose en paramétrant la période
; par exemple, j'aimerais créer [ 0 ; 1 ; 2 ; ... ; n-1 ; 0 ; 1 ; 2 ; ... ]
:
#let repète n = let aux = ref [] in for i = n-1 downto 0 do aux:= i::(!aux)
done; !aux;;
repète : int -> int list = <fun>
#let cyclique n = let aux = repète n in let rec liste = aux @ liste in
liste;;
Mais là :
let cyclique n = let rec liste = (repète n) @ liste in liste;;
> ^^^^^^^
Ce genre d'expressions n'est pas autorisé comme membre droit d'un "let rec".
Est-ce seulement un problème de syntaxe ou bien y a-t-il impossibilité
absolue, la taille de la liste servant de période devant être connue à la
compilation ?
Cordialement, Jean-Denis Eiden
next reply other threads:[~2014-09-07 9:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-07 9:31 Jean-Denis Eiden [this message]
2014-09-07 9:55 ` Rémy Besognet
2014-09-07 13:24 ` Jeremy Yallop
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