From: Brian Hurt <bhurt@janestcapital.com>
To: "Hezekiah M. Carty" <hcarty@atmos.umd.edu>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] camlidl and 2D arrays with the [out] attribute
Date: Fri, 15 Feb 2008 15:15:06 -0500 [thread overview]
Message-ID: <47B5F2CA.6070809@janestcapital.com> (raw)
In-Reply-To: <3a360f590802151102s27f9a2f6i7d9877daa7c67249@mail.gmail.com>
Hezekiah M. Carty wrote:
>I am attempting to use camlidl to wrap a function with the following C
>prototype portion (see [1] for the full prototype):
>
>... void c_plriddata( ... int nptsx, ... int nptsy, [out,
>size_is(nptsx,nptsy)] double ** zg ...);
>
>There is a lot more in the full prototype [1], but these are the
>important bits for this question. In this form, the 2D zg array is
>not allocated as I would have expected. Rather than allocating a
>rectangular nptsx by nptsy array, the generated C is:
>
>zg = camlidl_malloc(nptsx * sizeof(double *), _ctx);
>
>
>
I think the problem is with your C code. zg is defined as a pointer to
a pointer- not a pointer to an array! And yes, Virginia, there is a
difference. If c_plriddata is accessing this pointer as a pointer to an
array, you probably have a bug in your C code.
Brian
next prev parent reply other threads:[~2008-02-15 20:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 19:02 Hezekiah M. Carty
2008-02-15 20:15 ` Brian Hurt [this message]
2008-02-15 20:46 ` [Caml-list] " Hezekiah M. Carty
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47B5F2CA.6070809@janestcapital.com \
--to=bhurt@janestcapital.com \
--cc=caml-list@inria.fr \
--cc=hcarty@atmos.umd.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).