From: henri dubois-ferriere <henridf@gmail.com>
To: Alex Baretta <alex@baretta.com>
Cc: Richard Jones <rich@annexia.org>, Ocaml <caml-list@inria.fr>
Subject: Re: [Caml-list] marshalling polymorphic variants
Date: Tue, 29 Jun 2004 23:54:31 +0200 [thread overview]
Message-ID: <d61254fb040629145479307f92@mail.gmail.com> (raw)
In-Reply-To: <40E1ABE4.4080909@baretta.com>
actually i'm not the kind who tries to subvert the type system ;)
the scenario is as follows: an application saves state using some
polymorphic variants.
later the application has grown and adds more polymorphic variants to
the 'vocabulary' of state it might read in.
so, i wanted to be sure that the later application could still read
the earlier variants in a safe manner.
henri
On Tue, 29 Jun 2004 19:50:28 +0200, Alex Baretta <alex@baretta.com> wrote:
>
> Richard Jones wrote:
> > On Mon, Jun 28, 2004 at 11:02:25PM +0200, henri dubois-ferriere wrote:
> >
> >>hi,
> >>in the simple case below, it is possible to marshal out a ([`A | `B]
> >>list), and then read it back as a [> `A | `B | `C] list.
> >>
> >>can this behavior be counted on , or is it not something an
> >>application can assume to always work?
> >
> >
> > Better to use Obj.magic if you're explicitly trying to subvert the
> > type system?
> >
> > Rich.
> >
>
> It's better to use C if you are explicitly trying to subvert the type
> system...
>
> Alex
>
>
>
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prev parent reply other threads:[~2004-06-29 21:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-28 21:02 henri dubois-ferriere
2004-06-29 7:55 ` Basile Starynkevitch [local]
2004-06-29 8:54 ` Jacques GARRIGUE
2004-06-29 8:45 ` Richard Jones
2004-06-29 17:50 ` Alex Baretta
2004-06-29 21:54 ` henri dubois-ferriere [this message]
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