From: Brian Hurt <bhurt@spnz.org>
To: Basile STARYNKEVITCH <basile@starynkevitch.net>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Re: Void type?
Date: Sat, 28 Jul 2007 09:36:42 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0707280934150.16359@localhost> (raw)
In-Reply-To: <46AAFA8F.1000501@starynkevitch.net>
On Sat, 28 Jul 2007, Basile STARYNKEVITCH wrote:
> A void type would be useful for bizarre functions like f : int -> void
> this would mean that f never returns normally, i.e. that it loops
> indefinitely, or calls exit (to stop the entire program), or throws an
> exception but never returns.
The proper type for these functions would be f : int -> 'a. Take a look
at invalid_arg and failwith as examples. The advantage of having them
return an unbound 'a is that then unifies with any other given type,
allowing you to write code like:
if (some_test) then
some_value
else
invalid_arg "some_test failed!"
and have it work for all possible return types of some_value.
Brian
prev parent reply other threads:[~2007-07-28 13:26 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-28 4:14 Stefan Monnier
2007-07-28 4:33 ` [Caml-list] " Erik de Castro Lopo
2007-07-28 4:51 ` Chris King
2007-07-28 18:49 ` Stefan Monnier
2007-07-28 18:53 ` Basile STARYNKEVITCH
2007-07-29 0:48 ` Stefan Monnier
2007-07-28 18:57 ` Arnaud Spiwack
2007-07-28 6:12 ` Daniel de Rauglaudre
2007-07-28 6:15 ` Chung-chieh Shan
2007-07-28 8:22 ` [Caml-list] " rossberg
2007-07-29 6:31 ` Chung-chieh Shan
2007-07-29 11:05 ` [Caml-list] " Arnaud Spiwack
2007-07-29 11:16 ` Jon Harrop
2007-07-29 11:36 ` Arnaud Spiwack
2007-07-29 12:43 ` Richard Jones
2007-07-29 12:58 ` Arnaud Spiwack
2007-07-29 17:02 ` Richard Jones
2007-07-29 20:06 ` Arnaud Spiwack
2007-07-29 22:55 ` Brian Hurt
2007-07-30 4:40 ` skaller
2007-07-30 23:13 ` Brian Hurt
2007-07-31 8:52 ` Richard Jones
2007-07-31 13:08 ` Chris King
2007-07-31 15:27 ` Markus Mottl
2007-08-01 11:37 ` Tom
2007-08-01 16:23 ` Markus Mottl
2007-07-30 4:44 ` Geoffrey Alan Washburn
2007-07-30 13:11 ` [Caml-list] " Brian Hurt
2007-07-30 13:32 ` Christopher L Conway
2007-07-30 13:35 ` Geoffrey Alan Washburn
2007-07-30 13:41 ` [Caml-list] " Chris King
2007-07-30 17:43 ` Christophe Raffalli
2007-07-30 17:58 ` Markus Mottl
2007-07-30 14:27 ` Jeff Polakow
2007-07-28 7:58 ` Sébastien Hinderer
2007-07-28 8:13 ` [Caml-list] " Basile STARYNKEVITCH
2007-07-28 12:29 ` Christophe TROESTLER
2007-07-28 13:36 ` Brian Hurt [this message]
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