From: David Brown <caml-list@davidb.org>
To: Alex Baretta <alex@baretta.com>
Cc: Keith Wansbrough <Keith.Wansbrough@cl.cam.ac.uk>,
Luca Pascali <pasckosky2000@yahoo.it>,
caml-list@inria.fr
Subject: Re: [Caml-list] Recursive lists
Date: Fri, 8 Oct 2004 08:43:47 -0700 [thread overview]
Message-ID: <20041008154347.GA14210@old.davidb.org> (raw)
In-Reply-To: <4166A764.3010905@baretta.com>
On Fri, Oct 08, 2004 at 04:42:44PM +0200, Alex Baretta wrote:
> Keith Wansbrough wrote:
> >
> >How could they do this? It's just a list; there's nothing special
> >about it, except that it has no end.
>
> Lists can be recursive. This means that the list type models a set of
> values which includes the cyclic lists. The ocaml type system allow both
> for such values and for functions manipulating them, so it's perfectly
> natural to expect the List module to treat cyclic lists correctly.
> Besides, the cyclicity of a list is a perfectly decidable property by
> virtue of the pumping lemma.
I doubt that most users of list operations want the extra overhead needed
to check for cycles. Recursive lists are fairly rare in strict languages.
Dave
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next prev parent reply other threads:[~2004-10-08 15:43 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-08 13:20 Luca Pascali
2004-10-08 13:31 ` Keith Wansbrough
2004-10-08 14:32 ` skaller
2004-10-08 14:42 ` Alex Baretta
2004-10-08 15:43 ` David Brown [this message]
2004-10-08 17:19 ` Alex Baretta
2004-10-08 23:29 ` skaller
2004-10-09 8:35 ` Keith Wansbrough
2004-10-09 9:07 ` skaller
2004-10-09 8:32 ` Keith Wansbrough
2004-10-08 17:18 ` Wolfgang Lux
2004-10-11 0:44 ` Brian Hurt
2004-10-11 6:32 ` William Lovas
2004-10-11 6:52 ` Ville-Pertti Keinonen
2004-10-13 11:29 ` Alex Baretta
2004-10-13 11:22 ` Alex Baretta
2004-10-11 9:04 ` Keith Wansbrough
2004-10-08 14:05 ` Sébastien Furic
2004-10-08 14:44 ` Alex Baretta
2004-10-08 15:09 ` Jon Harrop
2004-10-08 15:13 ` james woodyatt
2004-10-08 14:26 ` sejourne_kevin
2004-10-08 18:28 ` Alex Baretta
2004-10-11 8:01 ` Jean-Christophe Filliatre
2004-10-11 9:20 ` Diego Olivier Fernandez Pons
2004-10-11 13:38 ` [Caml-list] About Obj (was Recursive lists) Christophe Raffalli
2004-10-11 13:49 ` [Caml-list] " Christophe Raffalli
2004-10-11 15:33 ` [Caml-list] " Jon Harrop
2004-10-11 16:09 ` Richard Jones
2004-10-11 16:40 ` [Caml-list] About Obj Yamagata Yoriyuki
2004-10-13 11:59 ` Alex Baretta
2004-10-11 16:24 ` [Caml-list] About Obj (was Recursive lists) james woodyatt
2004-10-11 16:46 ` brogoff
2004-10-11 17:24 ` james woodyatt
2004-10-12 0:19 ` skaller
2004-10-20 22:10 ` Greg K
2004-10-12 15:19 ` Christophe Raffalli
2004-10-13 11:42 ` Alex Baretta
2004-10-13 21:19 ` brogoff
2004-10-14 9:52 ` Andreas Rossberg
2004-10-14 17:38 ` brogoff
2004-10-15 8:22 ` Alex Baretta
2004-10-15 17:02 ` brogoff
2004-10-17 13:42 ` Alex Baretta
2004-10-12 6:17 ` [Caml-list] Recursive lists sejourne_kevin
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