220 31922 <20170402073350.GA3583@noemi> article Path: news.gmane.org!.POSTED!not-for-mail From: Magnus Fromreide Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: This variable should not be named: an identifier (not) to remember Date: Sun, 2 Apr 2017 09:33:50 +0200 Lines: 30 Approved: news@gmane.org Message-ID: <20170402073350.GA3583@noemi> References: <985b9b2a-c734-45eb-95f4-db4dc0d309a1@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: blaine.gmane.org 1491118436 21208 195.159.176.226 (2 Apr 2017 07:33:56 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 2 Apr 2017 07:33:56 +0000 (UTC) User-Agent: Mutt/1.8.0 (2017-02-23) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDELLREETMBRBYGSQLDQKGQE2WYGQ3Q@isocpp.org Sun Apr 02 09:33:51 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f70.google.com ([209.85.215.70]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cua1E-0004ec-DQ for gclcip-std-proposals@m.gmane.org; Sun, 02 Apr 2017 09:33:48 +0200 Original-Received: by mail-lf0-f70.google.com with SMTP id q141sf776305lfe.13 for ; Sun, 02 Apr 2017 00:33:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:subject:message-id:mail-followup-to:references :mime-version:content-disposition:in-reply-to:user-agent :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=+dWKO4qyPE92rUeiBQCuHtb43gg/Z9ugHokVOHLYUh4=; b=r8POE1ZGaW6+xBjW+q8jguTpykZpM9m6Dk/EJWnHHZU4UzhyL0TK01vBpdgfU+3m3R GR27R7gGlVP/OUT6XRPwK0qumUPpDpal1vJ5iY+48E1rDBmItGckmGCupCg9vlBpBKXE a8PZ2QELio1oPgBdwK7Ri7vnj0LPIAH97l+KE898S6nfUJkuy0T+QjCs6oxEVkYW3Vo0 iNfnhvyBj8bygeS/NlVbZOEm/XwJR5tJeldqj3fhm3n1o+v2H7DZ48ufv4cot/P0bnrU xixSaj12rEMrClt7CIaCjEOEAKnPhia3wKhYvSCitqROpF+77lcMoAp9yhqtiHU X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:subject:message-id:mail-followup-to :references:mime-version:content-disposition:in-reply-to:user-agent :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=+dWKO4qyPE92rUeiBQCuHtb43gg/Z9ugHokVOHLYUh4=; b=B2HIZME7GHVELyDvPwv2MKkcNsADyAFM0ATqyXhnk/Y9KFueJy6SZQq0RGJ/weKrXi wPr+GPJtJiDOQjRXrThNLcptQU4HnMzNoH9/QIs3Wg4AoLrWaD3/um3t261aMg0PlkeD kqakSZnKlCOZJ/8dCvVxmQTB49rJ58wDdIHNMCqOxpjMblgNRY1rtyK+SMIV5oJvxKwW WwlOdvOZo/OKXXtRa9h8h5uInRQZO4GyB7rh3VtbS8dyzr6xRvXUgjQo+KkKBK98zglT oH2nUwMqXAoMNHZhgXioC1stfyTiflY0Dxn/BXUF3/9RtDh/fcmFL86eQKU X-Gm-Message-State: AFeK/H0VXchsbHfuN3wZ++WIDm/kP1tTmrEWjDfR1+HHE/5Fif4qP6QHQRoNdekoeaNNXw== X-Received: by 10.25.216.154 with SMTP id r26mr1454871lfi.7.1491118434572; Sun, 02 Apr 2017 00:33:54 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.25.199.147 with SMTP id x141ls1875167lff.46.gmail; Sun, 02 Apr 2017 00:33:52 -0700 (PDT) X-Received: by 10.25.152.9 with SMTP id a9mr3003558lfe.155.1491118432573; Sun, 02 Apr 2017 00:33:52 -0700 (PDT) Original-Received: from mail.lysator.liu.se (mail.lysator.liu.se. [2001:6b0:17:f0a0::3]) by mx.google.com with ESMTPS id j9si5843844lfj.173.2017.04.02.00.33.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 02 Apr 2017 00:33:52 -0700 (PDT) Received-SPF: pass (google.com: domain of magfr@lysator.liu.se designates 2001:6b0:17:f0a0::3 as permitted sender) client-ip=2001:6b0:17:f0a0::3; Original-Received: from mail.lysator.liu.se (localhost [127.0.0.1]) by mail.lysator.liu.se (Postfix) with ESMTP id F301B40021 for ; Sun, 2 Apr 2017 09:33:51 +0200 (CEST) Original-Received: from noemi (h-155-4-132-137.na.cust.bahnhof.se [155.4.132.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.lysator.liu.se (Postfix) with ESMTPSA id CA1A640006 for ; Sun, 2 Apr 2017 09:33:51 +0200 (CEST) Mail-Followup-To: std-proposals@isocpp.org Content-Disposition: inline In-Reply-To: X-Virus-Scanned: ClamAV using ClamSMTP X-Original-Sender: magfr@lysator.liu.se X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of magfr@lysator.liu.se designates 2001:6b0:17:f0a0::3 as permitted sender) smtp.mailfrom=magfr@lysator.liu.se 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:31922 Archived-At: On Sat, Apr 01, 2017 at 09:19:37PM -0700, Richard Smith wrote: > I don't think you need a reserved identifier for this, nor to change the > meaning of any existing code (whether or not it uses a reserved > identifier). It seems to me that your use cases could be addressed by > allowing the identifier _ to declare multiple entities within a block > scope. (If it is multiply declared, any reference to it would be ill-formed > due to ambiguity; if it's only declared once, it can still be referenced > for backwards compatibility, but such usage could be deprecated.) > > Have you considered that possibility? It would give a better name (_ rather > than __) and avoid "breaking" existing code that uses __. If there are concerns about the use of __ due to it beeing used in real code then that is way worse for _. One common use of _ is as a macro name in gettextized GNU programs. Now, this use doesn't clash with the proposed use case but I doubt they are the only ones that have used the name. Additionally the name _ is reserved for the library so it is not even ours in the first place. /MF -- 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/20170402073350.GA3583%40noemi. .