220 12716 article Path: news.gmane.org!not-for-mail From: Jean-Marc Bourguet Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Usability extensions to offsetof Date: Mon, 8 Sep 2014 00:30:07 -0700 (PDT) Lines: 67 Approved: news@gmane.org Message-ID: References: <1790122.GP859xiMW3@tjmaciei-mobl4> <3079502.NAEi170Di4@tjmaciei-mobl4> <07066304-6357-4a10-824b-7c0451608996@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_6640_304909126.1410161407172" X-Trace: ger.gmane.org 1410161417 10152 80.91.229.3 (8 Sep 2014 07:30:17 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 8 Sep 2014 07:30:17 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC56XVMTUYPRB75VWWQAKGQE5JNPNEA@isocpp.org Mon Sep 08 09:30:11 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qa0-f70.google.com ([209.85.216.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XQtOr-0004W1-Ab for gclcip-std-proposals@m.gmane.org; Mon, 08 Sep 2014 09:30:09 +0200 Original-Received: by mail-qa0-f70.google.com with SMTP id j7sf40589245qaq.1 for ; Mon, 08 Sep 2014 00:30:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=SfBABbbqALjgFB00NdwuImrVby1uziYSq88u363b50Y=; b=Yg8xqAepuAPIqEmquctNXZX0f4+y4c66TTyGaj0wpX1Xkji3LAYD0w9FRHDPhIe5/9 gBjmO6FvTWP5l6oltnT0APYOliLSqh6plcMW4+cf+lPWyFw2UzHDA7SeHDdJupjpS6P1 VCzV6AfSH8yZ9pE/mMcUbrhIt9TzlXKOLucspVv/Uv+jSV4BNPQdDj/t5D4Kaxluk4sQ J2a3dDsFPBx7gVqZ52zpXef3J6D3c8Vy0hhfg6aDEelwwJ2sPEwBaMwlVhZeuqYevb9s kgugeyfd18wFpzloXs+8Vh5YnAY+BsU8pm4H03uczwWZW1JHIf+okvDVg4eJqj/b6Urj OqzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=SfBABbbqALjgFB00NdwuImrVby1uziYSq88u363b50Y=; b=jgmQfBWDUOww9fiPJ3HrW5pO/qALRMI4pn87bdUhDnYQwszqe6sHABgDottlSYsSSi vypbV5tOblTMYS92WVrg1ds0de7WjTWk4L1iz8zF+T+/xcxx4F6b9RprpDV2nfkgWT6B 0IPXgKFJGNN9qtrwRLupNEmk7aXsfpuPRcMgu9HF4qGEh4AcvRsjRPQZ/qG25ScXHY0J L8c8txPszZtwplKpan3FebB4qfp8R+LcK+K5IOPWkXOkeJkPVAcRY/zZUMexpeiDAMGf 3DlP8Ix8Cf/t28Ly0y03e2tAqoMLbBUyiluU2t/ZPIeTIp9qgONX0IoeWUConKsHHrSj 4V9w== X-Gm-Message-State: ALoCoQlIrMrxgUGwG+Y1DNKKnyk+cw9gz7m9/o3Ys/ZrQb+i5TnleMKPUHQbwCY2MgPcAKrwoESp X-Received: by 10.52.29.196 with SMTP id m4mr16830350vdh.4.1410161408442; Mon, 08 Sep 2014 00:30:08 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.90.51 with SMTP id w48ls1256729qgd.49.gmail; Mon, 08 Sep 2014 00:30:07 -0700 (PDT) X-Received: by 10.140.102.177 with SMTP id w46mr12775qge.15.1410161407788; Mon, 08 Sep 2014 00:30:07 -0700 (PDT) In-Reply-To: <07066304-6357-4a10-824b-7c0451608996@isocpp.org> X-Original-Sender: JM.Bourguet@gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:12716 Archived-At: ------=_Part_6640_304909126.1410161407172 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Le samedi 6 septembre 2014 10:13:46 UTC+2, Bengt Gustafsson a =C3=A9crit : > > To me it seems that the logical extension would be to allow casting of a= =20 > data member pointer to int to reveal the offset it represents. Isn't this= =20 > what we're trying to accomplish anyway? > I'm not sure there is one offset to get when considering virtual=20 inheritance (you may have to apply dynamically determined offset to get to= =20 the virtual base origin). Yours, --=20 Jean-Marc --=20 ---=20 You received this message because you are subscribed to the Google Groups "= ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. ------=_Part_6640_304909126.1410161407172 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Le samedi 6 septembre 2014 10:13:46 UTC+2, Bengt Gusta= fsson a =C3=A9crit :
To me it seems that the logical extension would be to allow cas= ting of a data member pointer to int to reveal the offset it represents. Is= n't this what we're trying to accomplish anyway?
I'm not sure there is one offset to get when considering virtua= l inheritance (you may have to apply dynamically determined offset to get t= o the virtual base origin).

Yours,
--&nb= sp;
Jean-Marc

--

---
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/<= /a>.
------=_Part_6640_304909126.1410161407172-- .