From: "Dominique Martinet" <asmadeus77@gmail.com>
To: skaller <skaller@users.sourceforge.net>
Cc: rossberg@ps.uni-sb.de, caml-list@yquem.inria.fr
Subject: Re: [Caml-list] Re: How important are circular lists/recursive objects?
Date: Fri, 5 Oct 2007 12:42:57 +0200 [thread overview]
Message-ID: <b79ece760710050342i74caf0dfwedf073911c645ef9@mail.gmail.com> (raw)
In-Reply-To: <1191536723.7771.20.camel@rosella.wigram>
On 05/10/2007, skaller <skaller@users.sourceforge.net> wrote:
> On Thu, 2007-10-04 at 23:36 +0200, rossberg@ps.uni-sb.de wrote:
> > skaller <skaller@users.sourceforge.net> wrote:
>
> > > Note that stuff like:
> > >
> > > let rec x= (1,x)
> > >
> > > is not generally allowed: in functional terms it is ill-defined,
> >
> > It is disallowed in OCaml because it has a cyclic type, not because it is
> > a cyclic value. Try with "ocaml -rectypes".
>
> lists have cyclic types too, they're not disallowed!
Lists have a base case to end the cycle, your definition does not (it
would be int*int*int...*int and infinity of time, wheras a list
contains either a value (head) and a list (tail), either nothing (that
is, the empty list [])
next prev parent reply other threads:[~2007-10-05 10:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-02 23:55 Brian Hurt
2007-04-03 6:24 ` Gleb Alexeyev
2007-04-03 6:58 ` [Caml-list] " Ville-Pertti Keinonen
2007-04-03 7:00 ` Andrej Bauer
2007-04-03 12:09 ` Jon Harrop
2007-04-03 13:31 ` Bruno De Fraine
2007-04-04 23:28 ` Brian Hurt
2007-04-05 0:51 ` Jon Harrop
2007-04-03 12:49 ` Philippe Wang
2007-04-04 3:52 ` Stefan Monnier
2007-04-04 5:28 ` [Caml-list] " skaller
2007-10-04 17:48 ` Fabrice Marchant
2007-10-04 20:39 ` skaller
2007-10-04 21:36 ` rossberg
2007-10-04 22:25 ` skaller
2007-10-05 10:42 ` Dominique Martinet [this message]
2007-10-08 9:57 ` Andreas Rossberg
2007-04-04 8:45 ` Don Syme
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