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.devel Subject: Re: FFI support for disjoint types Date: Sun, 30 Jan 2011 23:30:49 +0100 Message-ID: <87sjwaxbvq.fsf@gnu.org> References: <87bp5vx1zq.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: dough.gmane.org 1296426674 5832 80.91.229.12 (30 Jan 2011 22:31:14 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sun, 30 Jan 2011 22:31:14 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Sun Jan 30 23:31:10 2011 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Pjfna-0005m0-8B for guile-devel@m.gmane.org; Sun, 30 Jan 2011 23:31:10 +0100 Original-Received: from localhost ([127.0.0.1]:45951 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PjfnZ-0003DP-Q3 for guile-devel@m.gmane.org; Sun, 30 Jan 2011 17:31:09 -0500 Original-Received: from [140.186.70.92] (port=35714 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PjfnW-0003DK-Fb for guile-devel@gnu.org; Sun, 30 Jan 2011 17:31:07 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PjfnU-000482-Di for guile-devel@gnu.org; Sun, 30 Jan 2011 17:31:06 -0500 Original-Received: from lo.gmane.org ([80.91.229.12]:58449) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PjfnT-00047u-Uf for guile-devel@gnu.org; Sun, 30 Jan 2011 17:31:04 -0500 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1PjfnS-0005jY-Ft for guile-devel@gnu.org; Sun, 30 Jan 2011 23:31:02 +0100 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, 30 Jan 2011 23:31:02 +0100 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 30 Jan 2011 23:31:02 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 49 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 11 =?iso-8859-1?Q?Pluvi=F4se?= an 219 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: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu User-Agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.2 (gnu/linux) Cancel-Lock: sha1:E737jrUmbTeF4ULGci8xfQXE2RQ= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 80.91.229.12 X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:11440 Archived-At: Hello! ludo@gnu.org (Ludovic Courtès) writes: > (define-syntax define-wrapped-pointer-type > (lambda (stx) > (syntax-case stx () > ((_ pred wrap unwrap print) ;; hygiene > (with-syntax ((type-name (datum->syntax #'pred (gensym))) > (%wrap (datum->syntax #'wrap (gensym)))) > #'(begin > (define-record-type type-name > (%wrap pointer) > pred > (pointer unwrap)) > (define wrap > ;; Use a weak hash table to preserve pointer identity, i.e., > ;; PTR1 == PTR2 <-> (eq? (wrap PTR1) (wrap PTR2)). > (let ((ptr->obj (make-weak-value-hash-table))) > (lambda (ptr) > (or (hash-ref ptr->obj ptr) > (let ((o (%wrap ptr))) > (hash-set! ptr->obj ptr o) > o))))) > (set-record-type-printer! type-name print)))) > ((_ type-name print) ;; lazyness > (let* ((type-name* (syntax->datum #'type-name)) > (pred-name (datum->syntax #'type-name > (symbol-append type-name* '?))) > (wrap-name (datum->syntax #'type-name > (symbol-append 'wrap- type-name*))) > (%wrap-name (datum->syntax #'type-name > (symbol-append '%wrap- type-name*))) > (unwrap-name (datum->syntax #'type-name > (symbol-append 'unwrap- > type-name*)))) > (with-syntax ((pred pred-name) > (wrap wrap-name) > (%wrap %wrap-name) > (unwrap unwrap-name)) > #'(define-wrapped-pointer-type pred wrap unwrap print))))))) I finally added the macro in (system foreign). People looking for something similar with GOOPS capabilities can roll their own. Thanks, Ludo’.