From: Jean-Christophe Filliatre <Jean-Christophe.Filliatre@lri.fr>
To: David Fox <dsfox@cogsci.ucsd.edu>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Quick question - accessing variant value from C
Date: Thu, 29 Mar 2001 09:54:02 +0200 (MEST) [thread overview]
Message-ID: <15042.59930.557493.133492@pc803> (raw)
In-Reply-To: <luelvh6s7a.fsf@hci.ucsd.edu>
Hi,
You can use the macros Is_long / Is_block to discriminate between Null
and Address, since the first one is represented as an integer and the
second one as a structured block (in the later case, you can then
access the string with the Field macro).
Hope this helps,
--
Jean-Christophe FILLIATRE
mailto:Jean-Christophe.Filliatre@lri.fr
http://www.lri.fr/~filliatr
David Fox writes:
> I have a value of the following type being passed to an external:
>
> type pointer = Null | Address of string
>
> and I'd like to determine (in the C code) which variant the value is
> and get the pointer to the string. I've stared at mlvalues.h for a
> while, but I can't really figure it out. Can anyone help? You won't
> regret it...
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next prev parent reply other threads:[~2001-03-29 7:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-29 5:48 David Fox
2001-03-29 7:54 ` Jean-Christophe Filliatre [this message]
2001-03-29 8:36 ` Sven LUTHER
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