220 30249 article Path: news.gmane.org!.POSTED!not-for-mail From: "D. B." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: P0298: A byte type definition: with undefined pointer arithmetic? Date: Wed, 4 Jan 2017 20:33:25 +0000 Lines: 53 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11443f0c5b0e6305454ab2c3 X-Trace: blaine.gmane.org 1483562014 20864 195.159.176.226 (4 Jan 2017 20:33:34 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 4 Jan 2017 20:33:34 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCWNZ4ECS4GBBFVYWXBQKGQEBVRKGOQ@isocpp.org Wed Jan 04 21:33:29 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wj0-f200.google.com ([209.85.210.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cOsFO-000464-SB for gclcip-std-proposals@m.gmane.org; Wed, 04 Jan 2017 21:33:23 +0100 Original-Received: by mail-wj0-f200.google.com with SMTP id xr1sf117600166wjb.7 for ; Wed, 04 Jan 2017 12:33:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=29L90o9rALX0MjOLvw15pcFd6r0axRpIkhtEdqOZw60=; b=YbOE2E8wS4JQkTCzxsegnEN6SpUUDpTT7wIr2JSovaNOp3RvV/BrsB+aVv/IXBArMV fzxwtFHxgpH7lf/54O1Eo/Jn551xmtoyHmMMQ7NJG/nwmCKIlc0nYuhUHIsqOc1/LsEp cu5pZTKEEjNrYiJGs3UsVkEJTJRCI5Y3HKNwafUciriUmn/GY2YuWUQvdmMfcP451Zlk XFcy5cwdyvrTTThW3Ol1Rv9WCT5b+WG6YPMPhJQU4hEBlkyVl8nztt/InzToFnqlluls DaLpeJib0nK3j+PivCjcAIlH+5yRvdIVpJ4Vm53yNo3lr4BxDvmMCokikF4WS9xSC2/I UzxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=29L90o9rALX0MjOLvw15pcFd6r0axRpIkhtEdqOZw60=; b=ufteEwK1s4zAWyDnmW2ham1a1eSlLkpdH1nvBf1tHUW0lNCeL962/JEiFECMM+Cdqv 4jSxUogxcTBdXEpCKst6kv/ththcnaTOEw3tg/E185JYi95R31il27q0ndeDPHGXveD/ ie4OURE7oHAmFB/A5nKH7IeKnphalYsgJ6/rQDkPQgYGCHwDLjIrxctt+Sf3m+buUicF OFYxVdzypkLxRd0sCccVNttorv8QKkuneamUJAk9TMN0TTjjJf5ngSj4LxknuU8JWA1P XIWSRsz9SFa+xR/uh+QITggHVLq/MC5SdmbZplGMG+1YKwa991hJfffvWGWcGChiY6+k bAGg== X-Gm-Message-State: AIkVDXIQf8NN+UewfbQ3Rtl5wv8Fi+Ocg8CzmzWJ5zIsFrGB0jty57f5f3icyo5ICZDeNQ== X-Received: by 10.28.7.17 with SMTP id 17mr1613997wmh.8.1483562007322; Wed, 04 Jan 2017 12:33:27 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.26.13 with SMTP id a13ls6234585wma.17.gmail; Wed, 04 Jan 2017 12:33:26 -0800 (PST) X-Received: by 10.194.57.206 with SMTP id k14mr21135557wjq.30.1483562006270; Wed, 04 Jan 2017 12:33:26 -0800 (PST) Original-Received: from mail-wm0-x22b.google.com (mail-wm0-x22b.google.com. [2a00:1450:400c:c09::22b]) by mx.google.com with ESMTPS id 19si75609939wmt.10.2017.01.04.12.33.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Jan 2017 12:33:26 -0800 (PST) Received-SPF: pass (google.com: domain of db0451@gmail.com designates 2a00:1450:400c:c09::22b as permitted sender) client-ip=2a00:1450:400c:c09::22b; Original-Received: by mail-wm0-x22b.google.com with SMTP id c85so231652553wmi.1 for ; Wed, 04 Jan 2017 12:33:26 -0800 (PST) X-Received: by 10.28.6.203 with SMTP id 194mr55350362wmg.16.1483562005760; Wed, 04 Jan 2017 12:33:25 -0800 (PST) Original-Received: by 10.28.144.66 with HTTP; Wed, 4 Jan 2017 12:33:25 -0800 (PST) In-Reply-To: X-Original-Sender: db0451@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of db0451@gmail.com designates 2a00:1450:400c:c09::22b as permitted sender) smtp.mailfrom=db0451@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:30249 Archived-At: --001a11443f0c5b0e6305454ab2c3 Content-Type: text/plain; charset=UTF-8 Indeed, that's pretty much what I would like... not for selfish reasons anymore, since the design where I thought I needed that had *worse* UB that I had to resolve ;-) but simply because it makes sense, makes the "sequence" concept at all useful, and means that the so-called special properties of char* pointers can actually exist. But when I (thought I) needed this before, it was a fairly simple situation where an object would have a method invoked on it, taking a pointer to one of its members, and was then supposed to calculate the offset of that member within itself and do stuff with it. That hardly seems unreasonable. -- 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 email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CACGiwhG5mz25RMcPR10YR-D%2BHcSThhhfE6kJORXDf3WoR64qPQ%40mail.gmail.com. --001a11443f0c5b0e6305454ab2c3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Indeed, that's pretty much what I would like... n= ot for selfish reasons anymore, since the design where I thought I needed t= hat had worse UB that I had to resolve ;-) but simply because it mak= es sense, makes the "sequence" concept at all useful, and means t= hat the so-called special properties of char* pointers can actually exist.<= br>
But when I (thought I) needed this before, it was a fairly sim= ple situation where an object would have a method invoked on it, taking a p= ointer to one of its members, and was then supposed to calculate the offset= of that member within itself and do stuff with it. That hardly seems unrea= sonable.

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