220 31828 article Path: news.gmane.org!.POSTED!not-for-mail From: "'Matt Calabrese' 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: Tue, 28 Mar 2017 13:21:44 -0400 Lines: 94 Approved: news@gmane.org Message-ID: References: <985b9b2a-c734-45eb-95f4-db4dc0d309a1@isocpp.org> <2752007.h0gmCLmLCc@tjmaciei-mobl1> <6096248.pKJ4QPQkKS@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=94eb2c09351ab3efb7054bcdb14e X-Trace: blaine.gmane.org 1490721716 25042 195.159.176.226 (28 Mar 2017 17:21:56 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 28 Mar 2017 17:21:56 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBCGNLO5F34OBBKNX5LDAKGQE42N7BMQ@isocpp.org Tue Mar 28 19:21:51 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pg0-f72.google.com ([74.125.83.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1csuoO-00055J-L0 for gclcip-std-proposals@m.gmane.org; Tue, 28 Mar 2017 19:21:40 +0200 Original-Received: by mail-pg0-f72.google.com with SMTP id p20sf110082202pgd.21 for ; Tue, 28 Mar 2017 10:21:47 -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=+IzXfV0b2R44ohSlanvRm8J7lELXKrkQA/eERpJyNbU=; b=dXDorRHO9HRxEFkFwRWay+UEdwPLRT3Fzt/ZaHw+4EGGfn/VOef2uCudg2ajFB7dxD L7j88XmjPaCHHzvAqNcN9AYRHlSunbHQx0glD6+UXHpjTN7lX9RUQSXPxPAYvGK2uhyb +7K8l84ZpqJtcUAXkvRHfwyFKKXflASotM1Mm6jPqGXWbAFDbJoavstHEcyZM3C0aoXy bMXfj3zy7kzTjmbiTNLBpwOHutebi6CvOUnayt/fuRGSI6cFrJdYfWSj/xtpXQ6P4iWK usQdlUrv4Pz5+LEWTQWbQESgIbPDQtTLVS2n1BlDS5zLqOqz6Okt2cJym3y0iArJ+A8N brrg== 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=+IzXfV0b2R44ohSlanvRm8J7lELXKrkQA/eERpJyNbU=; b=Rct+JU2t+CIdpuhuxAO745ssz77ySJasv19Li7QAW5gZPkzv4e7z7rDo3sfd6JMqRI D7r6UgCWbzWgJcOy6tT4xG9KanKa6j39lQILQgUXxDfhB7NB2KVKO5xwFlINwnQXXrSI luPWiSbQM6vVpW4cXAgakn6AN+OJkZ1ZNda4ZYqI0afj4Fc90BG7TVDwE2FrewUEZ5ih RHqmuvB2jOkk/lidwh8m8AabKVhQgayegFXUhb1CJse3kV0H6L5Q068GWKU+njQirLak nffMJuF3aLr1NEeCdhl90lrf9tFW/jhGnz6CLM8EHHE/eSbUaQr0K9XqsnVLFCwXWWiv MWFQ== X-Gm-Message-State: AFeK/H086Tkb71rD/674GpUooH6ZorU486O8cxsEOtr4xaXqBFnYLnpXFb0gdcxt/lleOg== X-Received: by 10.98.0.7 with SMTP id 7mr886552pfa.29.1490721706484; Tue, 28 Mar 2017 10:21:46 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.7.18 with SMTP id 18ls567688ote.1.gmail; Tue, 28 Mar 2017 10:21:45 -0700 (PDT) X-Received: by 10.157.44.74 with SMTP id f68mr2395925otb.193.1490721705653; Tue, 28 Mar 2017 10:21:45 -0700 (PDT) Original-Received: from mail-oi0-x229.google.com (mail-oi0-x229.google.com. [2607:f8b0:4003:c06::229]) by mx.google.com with ESMTPS id i11si2431622ota.216.2017.03.28.10.21.45 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 Mar 2017 10:21:45 -0700 (PDT) Received-SPF: pass (google.com: domain of calabrese@google.com designates 2607:f8b0:4003:c06::229 as permitted sender) client-ip=2607:f8b0:4003:c06::229; Original-Received: by mail-oi0-x229.google.com with SMTP id o67so32804607oib.1 for ; Tue, 28 Mar 2017 10:21:45 -0700 (PDT) X-Received: by 10.202.242.5 with SMTP id q5mr16982281oih.138.1490721705261; Tue, 28 Mar 2017 10:21:45 -0700 (PDT) Original-Received: by 10.74.157.69 with HTTP; Tue, 28 Mar 2017 10:21:44 -0700 (PDT) In-Reply-To: <6096248.pKJ4QPQkKS@tjmaciei-mobl1> X-Original-Sender: calabrese@google.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@google.com; spf=pass (google.com: domain of calabrese@google.com designates 2607:f8b0:4003:c06::229 as permitted sender) smtp.mailfrom=calabrese@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com X-Original-From: Matt Calabrese 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:31828 Archived-At: --94eb2c09351ab3efb7054bcdb14e Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Tue, Mar 28, 2017 at 1:39 AM, Thiago Macieira wrote: > On segunda-feira, 27 de mar=C3=A7o de 2017 15:16:58 PDT 'Jeffrey Yasskin'= via > ISO C > ++ Standard - Future Proposals wrote: > > > 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]. > > I know it is. > > And yet it's in use. > https://github.com/v8/v8/blob/master/src/x64/codegen-x64.cc#L33 If we are afraid to break people who use explicitly reserved identifiers, then I think we'd be making a huge mistake. I agree that we should always minimize breaking people when it makes sense and I know that people draw the line at different places, but we should at least be able to make use of an identifier that has been reserved since the initial standard. --=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/CANh8DEkdFOYRNoKEDUPxdO-wMaG_CHeFbkou_27NiR9ZxvM= wwA%40mail.gmail.com. --94eb2c09351ab3efb7054bcdb14e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On T= ue, Mar 28, 2017 at 1:39 AM, Thiago Macieira <thiago@macieira.org&g= t; wrote:
On segunda-feira, 27 de = mar=C3=A7o de 2017 15:16:58 PDT 'Jeffrey Yasskin' via ISO C
++ Standard - Future Proposals wrote:
> > Just remember that there are already existing codebases using __ = as
> > identifier
> > or macro names.
>
> They're not allowed. "_" is ok outside of the global nam= espace, but "__" is
> reserved by [lex.name].

I know it is.

And yet it's in use.
https://github.com/v8/v8/blob/ma= ster/src/x64/codegen-x64.cc#L33

If= we are afraid to break people who use explicitly reserved identifiers, the= n I think we'd be making a huge mistake. I agree that we should always = minimize breaking people when it makes sense and I know that people draw th= e line at different places, but we should at least be able to make use of a= n identifier that has been reserved since the initial standard.
=

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