220 8734 <86a02b59-8c7f-4478-9f69-0ff53660c4eb@isocpp.org> article Path: news.gmane.org!not-for-mail From: Vittorio Romeo Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: "Raw" preprocessor macro arguments Date: Mon, 20 Jan 2014 02:49:08 -0800 (PST) Lines: 163 Approved: news@gmane.org Message-ID: <86a02b59-8c7f-4478-9f69-0ff53660c4eb@isocpp.org> References: <3fc9f495-0bb2-4432-bb79-385fe222feab@isocpp.org> <52DCE5B4.8090704@eudoxos.de> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_78_6611027.1390214948436" X-Trace: ger.gmane.org 1390214943 4463 80.91.229.3 (20 Jan 2014 10:49:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 20 Jan 2014 10:49:03 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCO3NDEYZQHRBJP66OLAKGQENYH56TY@isocpp.org Mon Jan 20 11:49:11 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pb0-f71.google.com ([209.85.160.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W5CPm-0008Cv-Rb for gclcip-std-proposals@m.gmane.org; Mon, 20 Jan 2014 11:49:11 +0100 Original-Received: by mail-pb0-f71.google.com with SMTP id jt11sf12216857pbb.2 for ; Mon, 20 Jan 2014 02:49:09 -0800 (PST) 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=N98eb37x2H7MVQ9flhbfReZIGHLYOEmOXgT4h0LfF2c=; b=YPZJnf8DXz85zGaDAe8MeLUL5Vrvt+tYADnc4Tzp/UaAfjl4J8gmhJXabHv8GUVHTv 74TXfu3Ng7m41pi3U6gBhf//eCCmjmMlh1GXkcBEWdyR5MRAy8i91Wt/L6gpnFkg1k8d iY/MQlYgL5vCr5O3BVZgqh5+qhfYjReJVYlZd6jY96Eq2UgAzcOQz9Kkr8ZP8W5rQBSN 2C3b4wMLBnGOC8zelgb3XmateEIpIXHa4QK33KNgcC52gObE61kq1EFVYaIW1YEc/Gmy SZlhRl9VMEW9LAS/YXcbGA9jD2dsLkhK5j599HCu93c+/b23vYByZOzbjBtU/NzvlNlx H4rg== 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=N98eb37x2H7MVQ9flhbfReZIGHLYOEmOXgT4h0LfF2c=; b=WOOpoKcaMmw91fEBIE5lRHFWWIIUrTc6aqfaWDt33fulQgJ9DsrTxIZBXAdWT+ULHO j9FQS+kHsAHn4yio6+4j0pylszJs/qWbyM5xbF83rCkWEtlDuiG5A7uw7wNtgfM8W6Wb mbc9DOXZztlbeCn1QIWTlBHz2fYs8PP+tym0E7gYiBaRrELMDV8hghPm+eYP0E6zfFsq T9P6wRTNvMiRZhso/iR1fWfn/ZcNRUZ5t59UVATufHRewI1++7+Y1EMkU5cTE5myGB86 iT2FDoZyWTQGh4cQD379Jd16GaosPx3l2yd8fBuDUsy7SoGSiPLlVsbC+lcEQQ19Ibrv kN3A== X-Gm-Message-State: ALoCoQkNkVbJE8CTUfmOOEhccB2NEgHo7b2my+P3uHOcJ1WRKPbtyjgOgWXmiKmYCDlfxN51IfEb X-Received: by 10.66.163.67 with SMTP id yg3mr499799pab.45.1390214949633; Mon, 20 Jan 2014 02:49:09 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.50.171 with SMTP id s40ls985370qga.17.gmail; Mon, 20 Jan 2014 02:49:08 -0800 (PST) X-Received: by 10.140.105.54 with SMTP id b51mr2883qgf.29.1390214948926; Mon, 20 Jan 2014 02:49:08 -0800 (PST) In-Reply-To: <52DCE5B4.8090704@eudoxos.de> X-Original-Sender: vittorio.romeo.vee@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:8734 Archived-At: ------=_Part_78_6611027.1390214948436 Content-Type: text/plain; charset=UTF-8 This is not what I expect, since it also prints the parenthesis. The solution would be having a "variadic stringify function" #define SSVPP_IMPL_STRINGIFYWITHCOMMAS(mIdx, mData, mArg) SSVPP_STRINGIFY(mArg)SSVPP_IF(mIdx, ", ", SSVPP_EMPTY()) #define SSVPP_STRINGIFYWITHCOMMAS(...) SSVPP_FOREACH(SSVPP_IMPL_STRINGIFYWITHCOMMAS, SSVPP_EMPTY(), __VA_ARGS__) However, it needs to be explicitly called, and the "raw argument" consistency fails here. On Monday, 20 January 2014 10:00:36 UTC+1, Roland Bock wrote: > > On 2014-01-20 09:53, Vittorio Romeo wrote: > > http://ideone.com/B5hVDS > > > > This example shows un-intuitive behavior. > > The "raw argument" is actually passed as multiple arguments, and does > > not expand correctly. > > > > I would expect the program to print "1, 2, 3" or "1,2,3" - instead, it > > fails to compile. > > > Did not check the other examples, but how about this: > > #define RAW(...) (__VA_ARGS__) > > > http://ideone.com/DXXOXP (works as expected) > -- --- 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_78_6611027.1390214948436 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
This is not what I expect, since it also prints the parent= hesis. 
The solution would be having a "variadic stringify function= "
#defi=
ne SSVPP_IMPL_STR=
INGIFYWITHCOMMAS(mIdx,<=
/span> mData, mArg)   SSVPP_STRINGIFY(mArg)SSVPP_IF(mIdx, ", ", SSVPP_EMPTY())
#define SSVPP_STRINGIFYWITHCOMMAS(..=
..)             &=
nbsp;        SSVPP_FOREACH=
(SSVPP_IMPL_STRINGIFYWITHCOMMAS, SSVPP_EMPTY=
(), __VA_ARGS__)

However, it ne= eds to be explicitly called, and the "raw argument" consistency fails here.=

On Monday, 20 January 2014 10:00:36 UTC+1, Roland Bock wrote:On 2014-01-20 09:53, Vittorio Romeo= wrote:
> http://ideone.com/B5hVDS
>
> This example shows un-intuitive behavior.
> The "raw argument" is actually passed as multiple arguments, and d= oes
> not expand correctly.
>
> I would expect the program to print "1, 2, 3" or "1,2,3" - instead= , it
> fails to compile.
>
Did not check the other examples, but how about this:

#define RAW(...) (__VA_ARGS__)


http://ideone.com/DXXOXP (works as expected)

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