From: skaller <skaller@users.sourceforge.net>
To: "Marcin 'Qrczak' Kowalczyk" <qrczak@knm.org.pl>
Cc: cvalente@co.sapo.pt, caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] Re: OCAML Downcasting?
Date: 23 Sep 2004 01:50:15 +1000 [thread overview]
Message-ID: <1095868215.2581.44.camel@pelican.wigram> (raw)
In-Reply-To: <87fz5aphr0.fsf@qrnik.zagroda>
On Wed, 2004-09-22 at 23:15, Marcin 'Qrczak' Kowalczyk wrote:
> Cláudio Valente <cvalente@co.sapo.pt> writes:
> I meant exhaustive tests, not heuristics for easy cases where the
> divisor is constant.
It is of course possible to it entirely statically right
now in Ocaml by using an abstract type for a non-zero int.
Not as good as CDuce's interval arithmetic because you have
to handle the 0 in the int-> nonzero_int conversion, but still
afterwards you can divide without an exception.
Some functions, eg multiplication, preserve non-zeroness,
so in many cases you can use static typing to avoid
gratuitous checks for zero.
As you may have noted in my Felix example -- exceptions
are just too powerful: I forgot to catch the exception.
I fixed my modulus function too .. but no doubt I have
missed others. Perhaps static checking would make
programming harder -- but nothing is harder than
exhaustively testing a complex program.
--
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850,
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net
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next prev parent reply other threads:[~2004-09-22 15:50 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <ci7tcf$qqf$1@wolfberry.srv.cs.cmu.edu>
[not found] ` <ci9ggm$i6p$1@wolfberry.srv.cs.cmu.edu>
2004-09-21 8:03 ` Jacques GARRIGUE
2004-09-21 8:43 ` Damien Pous
2004-09-21 9:15 ` Jacques GARRIGUE
2004-09-21 9:29 ` skaller
2004-09-21 9:49 ` Jacques GARRIGUE
2004-09-21 9:34 ` Stefano Zacchiroli
2004-09-21 9:56 ` Jacques GARRIGUE
2004-09-21 19:27 ` Michael Vanier
2004-09-21 21:38 ` Brian Hurt
2004-09-21 22:06 ` Michael Vanier
2004-09-21 22:32 ` Brian Hurt
2004-09-22 1:04 ` skaller
2004-09-21 22:20 ` Marcin 'Qrczak' Kowalczyk
2004-09-22 2:26 ` skaller
2004-09-22 6:31 ` Marcin 'Qrczak' Kowalczyk
2004-09-22 9:03 ` sejourne_kevin
2004-09-22 10:29 ` Richard Jones
2004-09-22 18:39 ` Brian Hurt
2004-09-22 10:50 ` skaller
2004-09-22 12:03 ` Alain Frisch
2004-09-22 12:50 ` Cláudio Valente
2004-09-22 13:15 ` Marcin 'Qrczak' Kowalczyk
2004-09-22 15:50 ` skaller [this message]
2004-09-22 18:42 ` Brian Hurt
2004-09-22 18:44 ` Marcin 'Qrczak' Kowalczyk
2004-09-22 19:18 ` Brian Hurt
2004-09-22 0:50 ` skaller
2004-09-22 1:30 ` Jacques GARRIGUE
2004-09-22 2:59 ` skaller
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