220 31790 article Path: news.gmane.org!.POSTED!not-for-mail From: "'Jeffrey Yasskin' via ISO C++ Standard - Future Proposals" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: This variable should not be named: an identifier (not) to remember Date: Mon, 27 Mar 2017 15:16:58 -0700 Lines: 91 Approved: news@gmane.org Message-ID: References: <985b9b2a-c734-45eb-95f4-db4dc0d309a1@isocpp.org> <2752007.h0gmCLmLCc@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=94eb2c08046adb8594054bbdb4b4 X-Trace: blaine.gmane.org 1490653047 3624 195.159.176.226 (27 Mar 2017 22:17:27 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 27 Mar 2017 22:17:27 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDDM34EO6QDRB34643DAKGQELPGI2QQ@isocpp.org Tue Mar 28 00:17:22 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f69.google.com ([209.85.218.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cscwt-0008CE-Ju for gclcip-std-proposals@m.gmane.org; Tue, 28 Mar 2017 00:17:15 +0200 Original-Received: by mail-oi0-f69.google.com with SMTP id f193sf52831792oib.1 for ; Mon, 27 Mar 2017 15:17:21 -0700 (PDT) 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=gL9oLmx1rXtr02ySF77jybBW90ASBQkSKgApWiAzPQs=; b=q2yc6+Vzd3mkO/5G32ifc9vOTb0eEIrOPfnerxkfL8SoFSIE+Z1I3xmBWAbkadJ/xJ SFlK7BNLE/bKmudBivhhN0lEETlD0vp8Aut5OVt8Z2z/bIRIhvmhJy09RnS/o3qtosff xsQNyr06tCoVz8Jg8hYGrW5vRgdQ71Bl4sx32P5VCX31c50A6gz59WdOnKGxXLDZNQS1 8Jq40WZNd/f/5EHQqJ48bA9d78BkhAPql1MSY/ALX/V2LlYBJJIPpON81xDJRne0gcsN sI3drw2hegppNNAYwmn9ABqJ7Jxl0eRsRh82WK8IL4+4FulS2zANy8Ta4H1C5CSPa5YE /T+g== 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=gL9oLmx1rXtr02ySF77jybBW90ASBQkSKgApWiAzPQs=; b=He3r3X187Xo7TG0LEOnus8i8fSy49a3mR7+rCSr2R8vEiifyUSqHGEXZyJoDXVf0dg 8vCd9xwBoJifgXyk5yTxk+kEA+bmz3a0fdqDGagZUpAq9xG3+JhFJpp54aalAOhwVoqz 8n/pt7BGuTLFIo5tQ4dpylZMXae9kaaTe5HekPA7YSxsgDJT+qGurh6Eb+HbilGzNDkA LFgs7KzY7oaS1UAOLxfb0OKHDP5LUHDKhx3uT3H3j2xGrATWLzrDMro5/SiFm9utprBp r4zYw4QhYYr2kR9d9lnYep9OAvAIu6fpvRTpylKXO1hZP/YuaAyOD+SVijLbd+yabtFQ uTRA== X-Gm-Message-State: AFeK/H0tlKNPaU5P80imykkb6y6dF4TRNNlvO0Y0yyP7hbJl5fpkBeogAqrIYu1Y5shU8A== X-Received: by 10.157.3.9 with SMTP id 9mr6878513otv.100.1490653040224; Mon, 27 Mar 2017 15:17:20 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.38.42 with SMTP id a39ls1250433otb.38.gmail; Mon, 27 Mar 2017 15:17:19 -0700 (PDT) X-Received: by 10.31.84.66 with SMTP id i63mr10430178vkb.157.1490653039516; Mon, 27 Mar 2017 15:17:19 -0700 (PDT) Original-Received: from mail-vk0-x22c.google.com (mail-vk0-x22c.google.com. [2607:f8b0:400c:c05::22c]) by mx.google.com with ESMTPS id c188si792367vkh.91.2017.03.27.15.17.19 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 27 Mar 2017 15:17:19 -0700 (PDT) Received-SPF: pass (google.com: domain of jyasskin@google.com designates 2607:f8b0:400c:c05::22c as permitted sender) client-ip=2607:f8b0:400c:c05::22c; Original-Received: by mail-vk0-x22c.google.com with SMTP id d188so68797494vka.0 for ; Mon, 27 Mar 2017 15:17:19 -0700 (PDT) X-Received: by 10.159.41.131 with SMTP id s3mr8893491uas.72.1490653038693; Mon, 27 Mar 2017 15:17:18 -0700 (PDT) Original-Received: by 10.31.137.142 with HTTP; Mon, 27 Mar 2017 15:16:58 -0700 (PDT) In-Reply-To: <2752007.h0gmCLmLCc@tjmaciei-mobl1> X-Original-Sender: jyasskin@google.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@google.com; spf=pass (google.com: domain of jyasskin@google.com designates 2607:f8b0:400c:c05::22c as permitted sender) smtp.mailfrom=jyasskin@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com X-Original-From: Jeffrey Yasskin 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:31790 Archived-At: --94eb2c08046adb8594054bbdb4b4 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Mon, Mar 27, 2017 at 2:30 PM, Thiago Macieira wrote: > On segunda-feira, 27 de mar=C3=A7o de 2017 13:27:11 PDT Alberto Barbati w= rote: > > Hello, > > > > this is a draft for a proposal to add a special meaning to the identifi= er > > __ (double underscore) so that it can be used (even repeatedly in the > same > > lexical scope) for all variables whose name is not important and that i= s > no > > longer needed after declaration. The draft includes a few examples. > > > > Is there any interest in this? > > Just remember that there are already existing codebases using __ as > identifier > or macro names. > They're not allowed. "_" is ok outside of the global namespace, but "__" is reserved by [lex.name]. Jeffrey --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/CANh-dXm5Bb-w%2B89ZVMESVqzGEz7yjiQYQp9gVrn8Om1jX= uKyfg%40mail.gmail.com. --94eb2c08046adb8594054bbdb4b4 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On M= on, Mar 27, 2017 at 2:30 PM, Thiago Macieira <thiago@m= acieira.org> wrote:
On segunda-feira, 27 de mar=C3=A7o de 2017 13:27:11 PDT Alberto B= arbati wrote:
> Hello,
>
> this is a draft for a proposal to add a special meaning to the identif= ier
> __ (double underscore) so that it can be used (even repeatedly in the = same
> lexical scope) for all variables whose name is not important and that = is no
> longer needed after declaration. The draft includes a few examples. >
> Is there any interest in this?

Just remember that there are already existing codebases using __ as = identifier
or macro names.

They're not allowed= .. "_" is ok outside of the global namespace, but "__" i= s reserved by [lex.name].

Jeffrey

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