220 31863 article Path: news.gmane.org!.POSTED!not-for-mail From: Alberto Barbati Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: This variable should not be named: an identifier (not) to remember Date: Tue, 28 Mar 2017 23:15:06 +0200 Lines: 63 Approved: news@gmane.org Message-ID: References: <985b9b2a-c734-45eb-95f4-db4dc0d309a1@isocpp.org> <8028901.3vRB6vfJZY@tjmaciei-mobl1> <22600974.uQoRWN8BZc@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 (1.0) Content-Type: multipart/alternative; boundary=Apple-Mail-F645762C-F12B-45B6-8906-54B787115742 Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1490735724 14133 195.159.176.226 (28 Mar 2017 21:15:24 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 28 Mar 2017 21:15:24 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCPY5DV6RIMBBXFE5PDAKGQEG7RPMYQ@isocpp.org Tue Mar 28 23:15:19 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f69.google.com ([209.85.215.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1csySE-0001du-Rn for gclcip-std-proposals@m.gmane.org; Tue, 28 Mar 2017 23:15:02 +0200 Original-Received: by mail-lf0-f69.google.com with SMTP id s134sf38616163lfe.8 for ; Tue, 28 Mar 2017 14:15:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:content-transfer-encoding:mime-version:date:subject:message-id :references:in-reply-to: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=M/005ftNOnBmN4+PUwui3LZjCyPJM9Mtgm31OmA4Xdc=; b=SxRyodA3Zvf1fElTVKUCQTw06szFFcbe+M+t3xmZ4EwEG5nVf4UZENIwC+49rInDgh SSaWzcxtwHAopRxE4Y+Wf9pacs3umRVrAlemgmrKzyEvZ+vitRXrMmNL61LRnkWx8MYK C7fj97/aT9AoNdseKkdxGYFqrnL4ddo2gMvh/Nn1lDQchZePaIgeW/S23+7/apmodltL C3seSHm8MbVR9nfyMYS2GSLsSnyllnB3s/p567pOQKQQVQk9krqEk/+B8+GSfMXXJs3u /KrkEbZRopSjOycBpkhhy9eRlRDZ4zMzqh+uu1VJ7wudKCc/9Ib031l49fYq9C+S/aQ0 VmQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:content-transfer-encoding:mime-version:date :subject:message-id:references:in-reply-to: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=M/005ftNOnBmN4+PUwui3LZjCyPJM9Mtgm31OmA4Xdc=; b=Qf/cmwkIMpgpqfc97V6VKACHhyWRz+J6s/kmcLAuW0sQlKUsVNIi+lRvftLHU9iV9S CRmH9IEKD7tWhRF9CGruCunJnRoFxt0sd58deuOzOEhZwqlbTJoKFAk534s15VoGowYg w7hnhVzvVP3kuA21LYbo2LrtDXR58KfgwiSYtdx5g8b0RQv1o7MzL4ugv4rAad1KgDB+ 2ylWgufEuQ45ggCzU/wOyxyGcfGE5i55q4gXpLDxzTKPomK6+zuq8us3n/d4bJ8+Nto6 HshIUuinLP0wBgvvzq71l55ISymX6fP0Lztac/qvqlELXvH+oKqHPVUeyM/cTJVEfZ64 Mp6 X-Gm-Message-State: AFeK/H3GKxvkWeQa7yryO0toPCKSphxNe4vf2RnKZOcHeP4chdiBwkpMxk8av0eT6FhKQg== X-Received: by 10.25.195.206 with SMTP id t197mr4045954lff.11.1490735709128; Tue, 28 Mar 2017 14:15:09 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.148.208 with SMTP id w199ls1120509wmd.24.gmail; Tue, 28 Mar 2017 14:15:08 -0700 (PDT) X-Received: by 10.28.151.7 with SMTP id z7mr15733533wmd.53.1490735708158; Tue, 28 Mar 2017 14:15:08 -0700 (PDT) Original-Received: from mail-wr0-x243.google.com (mail-wr0-x243.google.com. [2a00:1450:400c:c0c::243]) by mx.google.com with ESMTPS id d47si3274511wrd.332.2017.03.28.14.15.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 Mar 2017 14:15:08 -0700 (PDT) Received-SPF: pass (google.com: domain of albertobarbati@gmail.com designates 2a00:1450:400c:c0c::243 as permitted sender) client-ip=2a00:1450:400c:c0c::243; Original-Received: by mail-wr0-x243.google.com with SMTP id p52so21712047wrc.2 for ; Tue, 28 Mar 2017 14:15:08 -0700 (PDT) X-Received: by 10.223.182.148 with SMTP id j20mr51550wre.152.1490735707708; Tue, 28 Mar 2017 14:15:07 -0700 (PDT) Original-Received: from [192.168.178.44] ([151.20.212.10]) by smtp.gmail.com with ESMTPSA id 94sm6347877wrp.34.2017.03.28.14.15.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 Mar 2017 14:15:06 -0700 (PDT) In-Reply-To: X-Mailer: iPad Mail (14D27) X-Original-Sender: AlbertoBarbati@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of albertobarbati@gmail.com designates 2a00:1450:400c:c0c::243 as permitted sender) smtp.mailfrom=albertobarbati@gmail.com; dmarc=pass (p=NONE sp=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:31863 Archived-At: --Apple-Mail-F645762C-F12B-45B6-8906-54B787115742 Content-Type: text/plain; charset=UTF-8 > Il giorno 28 mar 2017, alle ore 23:09, Viacheslav Usov ha scritto: > > On Tue, Mar 28, 2017 at 10:53 PM, Alberto Barbati wrote: > > > Care to explain? I can't see UB there. > > [lex.name]/3 "In addition, some identifiers are reserved for use by C++ implementations and shall not be used otherwise; no diagnostic is required." > > No behavior is imposed by the International Standard, hence [defns.undefined] applies. Well... the starting point of the whole discussion is that my proposal would allow the use of __ in user code... Alberto -- 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/B03D71FC-16DD-4717-95B8-375144E17909%40gmail.com. --Apple-Mail-F645762C-F12B-45B6-8906-54B787115742 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Il giorn= o 28 mar 2017, alle ore 23:09, Viacheslav Usov <via.usov@gmail.com> ha scritto:

On Tue, Mar 28, 2017 at 10:53 PM, Alberto Barbati <albertobarbati@gmail.com> wrote:

> Care to explain? I can't see UB there.

[lex.name]/3 "In addition, some identifiers are = reserved for use by C++ implementations and shall not be used otherwise; no diagnostic is required."

No behavior is im= posed by the International Standard, hence [defns.undefined] applies.
=
Well... the starting point of the whole discuss= ion is that my proposal would allow the use of __ in user code...

Alberto

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