220 14342 <26549f31-89d2-4d30-b031-e067036f44c8@isocpp.org> article Path: news.gmane.org!not-for-mail From: Myriachan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Visual C++'s __identifier keyword Date: Thu, 30 Oct 2014 22:10:07 -0700 (PDT) Lines: 115 Approved: news@gmane.org Message-ID: <26549f31-89d2-4d30-b031-e067036f44c8@isocpp.org> References: <7e589557-cb3c-4323-9565-e6b859df0e76@isocpp.org> <4610134.1FNuJdPqBg@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1320_1561302656.1414732207988" X-Trace: ger.gmane.org 1414732217 3053 80.91.229.3 (31 Oct 2014 05:10:17 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 31 Oct 2014 05:10:17 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDKLT4PURQHRBMNTZSRAKGQEOZKW6SQ@isocpp.org Fri Oct 31 06:10:11 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qc0-f200.google.com ([209.85.216.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xk4TS-0006V3-Pc for gclcip-std-proposals@m.gmane.org; Fri, 31 Oct 2014 06:10:10 +0100 Original-Received: by mail-qc0-f200.google.com with SMTP id m20sf12627421qcx.7 for ; Thu, 30 Oct 2014 22:10:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=55aim+CC/BAe6WpOE7tF0auKFpSqDPRVnANxsiZpQM4=; b=JP1bLjQW7MwBQGEDZSck4/PA28ZubCGhQ3eCGy/rBSP/tC2jxvXPNu5c53jMUfBVha HROhtKSTZEoh66i54AA3Nmfnn9Tf9DImuyKu2tMHCj6Y3F1xclQ3tnqupK13BRXncy3C 4UMVVwJHOAUr+BBMeBX1Emh25KMEEUj4YudKsJH13k/EUMs0iSyYhD6j1oBz9GAPz80y rxAZLJ4Jvxq4TKx7zhb0iT2fb5G0ES59XlQEiX9UyeorUkDRwi450UmBMCkUUSwBM9Lq oJFeHsV8STTCSTrVUNE93I3u1ck2epZbMN7PdUakUSzecvzGLi3AJjp/flbqeeeDpJTu YS7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=55aim+CC/BAe6WpOE7tF0auKFpSqDPRVnANxsiZpQM4=; b=Eg8/xPDLA6SYLstpKQUixlNPQqOsOqQx1q7BsicfMN/QNQNU9Ted5zXwCskGcYsJRB RPgMcvBlIlV0zl8YIowKr+gbZxSyygVOfKONGHtN9M9BoKBFTv8X+HEJWPnZx/Hg9WqG 9x1FddtlgMtvXEWiFbt0Q8Z55d6pj+b4HGU4/SgM71zmsq0uhalhhTEXZQfD7h5LxQBc Wm4ATBreGxqtRBpGIlFje5WF4OkwFvcExo+9NRaf9i8PZcqm2dhpdqFQI+ioTk+gx1KU rOmBvQZvN+/wKU/Gm0CK828lFiFq0v53GvdkWGWUt9dFNsiAiRqpP+6aCrtJj9MN6YO2 TodA== X-Gm-Message-State: ALoCoQnZHrBIvbduzfUwZecQLwfdns6eBOLsRDGAR+E/hYO7yHwb9uSV7JyCGvQR9u1r2MkeVpPk X-Received: by 10.236.61.132 with SMTP id w4mr10115712yhc.2.1414732210031; Thu, 30 Oct 2014 22:10:10 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.17.206 with SMTP id 75ls1130003ior.89.gmail; Thu, 30 Oct 2014 22:10:09 -0700 (PDT) X-Received: by 10.50.73.4 with SMTP id h4mr17072igv.0.1414732209216; Thu, 30 Oct 2014 22:10:09 -0700 (PDT) In-Reply-To: <4610134.1FNuJdPqBg@tjmaciei-mobl4> X-Original-Sender: myriachan@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:14342 Archived-At: ------=_Part_1320_1561302656.1414732207988 Content-Type: text/plain; charset=UTF-8 On Thursday, October 30, 2014 8:14:46 PM UTC-7, Thiago Macieira wrote: > > How about an identifier containing the closing parenthesis? You probably > want > to have this as a string literal. > > With GCC: > > extern "C" int class_() asm("class"); > extern "C" int closingparen() asm("("); > > Visual C++ equivalent, in theory: extern "C" int __identifier(class)(); extern "C" int __identifier("(")(); > Or, maybe just use the backtick like SQL does: > > SELECT `SELECT` FROM `FROM`; > > I actually prefer the MySQL `` style to __identifier =) (It's implementation-specific, by the way. Oracle uses double quotes, and Microsoft SQL Server I believe uses square brackets...?) > But aside from external names, what use would this have? I'm not sure I > understood your example for wchar_t/char16_t and, to be honest, it's not > relevant because the standard can assume that the implementation fully > implements the standard. > > Certainly; it was just a little trick you can do in the Visual C++ style, and isn't something needed in the Standard. It doesn't work with GCC or Clang's __asm__ because those don't modify the name of the variable, only its object symbol. It's like creating a legal-identifier alias, whereas MSVC's __identifier actually makes the identifier name be "class" and will show it in error messages that way and such. Melissa -- --- 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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. ------=_Part_1320_1561302656.1414732207988 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Thursday, October 30, 2014 8:14:46 PM UTC-7, Thiago Mac= ieira wrote:
How about an ident= ifier containing the closing parenthesis? You probably want=20
to have this as a string literal.

With GCC:

extern "C" int class_() asm("class");
extern "C" int closingparen() asm("(");


Visual C++ equivalent, in theory:

extern "= C" int __identifier(class)();
extern "C" int __identifier("(")();
&nb= sp;
Or, maybe just use th= e backtick like SQL does:

SELECT `SELECT` FROM `FROM`;


I actually prefer the MySQL `` style to __identif= ier =3D)  (It's implementation-specific, by the way.  Oracle uses= double quotes, and Microsoft SQL Server I believe uses square brackets...?= )
 
But aside fro= m external names, what use would this have? I'm not sure I=20
understood your example for wchar_t/char16_t and, to be honest, it's no= t=20
relevant because the standard can assume that the implementation fully= =20
implements the standard.


Certainly; it was just a little trick you can do = in the Visual C++ style, and isn't something needed in the Standard.  = It doesn't work with GCC or Clang's __asm__ because those don't modify the = name of the variable, only its object symbol.  It's like creating a le= gal-identifier alias, whereas MSVC's __identifier actually makes the identi= fier name be "class" and will show it in error messages that way and such.<= br>
Melissa

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