From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.user Subject: Re: Passing C pointers through guile Date: Sun, 06 Jul 2008 21:20:31 +0200 Message-ID: <87hcb2bz0g.fsf@gnu.org> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1215372058 5222 80.91.229.12 (6 Jul 2008 19:20:58 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 6 Jul 2008 19:20:58 +0000 (UTC) To: guile-user@gnu.org Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Sun Jul 06 21:21:45 2008 Return-path: Envelope-to: guile-user@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1KFZnm-00058a-RP for guile-user@m.gmane.org; Sun, 06 Jul 2008 21:21:39 +0200 Original-Received: from localhost ([127.0.0.1]:36641 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KFZmv-0007Yv-Lz for guile-user@m.gmane.org; Sun, 06 Jul 2008 15:20:45 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KFZms-0007Ye-5K for guile-user@gnu.org; Sun, 06 Jul 2008 15:20:42 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KFZmq-0007YS-Pd for guile-user@gnu.org; Sun, 06 Jul 2008 15:20:41 -0400 Original-Received: from [199.232.76.173] (port=42075 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KFZmq-0007YP-N5 for guile-user@gnu.org; Sun, 06 Jul 2008 15:20:40 -0400 Original-Received: from main.gmane.org ([80.91.229.2]:50184 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KFZmq-0005ar-EM for guile-user@gnu.org; Sun, 06 Jul 2008 15:20:40 -0400 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1KFZmo-0002l5-SE for guile-user@gnu.org; Sun, 06 Jul 2008 19:20:38 +0000 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 06 Jul 2008 19:20:38 +0000 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 06 Jul 2008 19:20:38 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 27 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 19 Messidor an 216 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) Cancel-Lock: sha1:/ksRUL0OeIzb6e8Ypd3FJvgFqFY= X-detected-kernel: by monty-python.gnu.org: Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-user-bounces+guile-user=m.gmane.org@gnu.org Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.user:6631 Archived-At: Hi, "Kjetil S. Matheussen" writes: > I haven't heard of the "uo" field before, but at least using a SMOB > is really inconvenient, and using an unsigned long for storing > pointers is really convenient. (BTW. How does swig and gwrap handle > pointers?) G-Wrap has "wrapped C types" (WCTs): http://www.nongnu.org/g-wrap/manual/Wrapping-a-C-Pointer-Type.html IIRC, it uses a SMOB containing additional information behind the scenes. > I agree with Maciek that it would at least be mind-comforting to have > functions like scm_to_ptr/etc, although not strictly necessary, > since using integers works just fine. `scm_{to,from}_uintptr ()' could be handy (patches welcome!). That said, using a Scheme integer to represent a pointer wouldn't be efficient (pointers would likely translate to bignums). Thanks, Ludovic.