220 40586 article Path: news.gmane.org!.POSTED!not-for-mail From: Dejan Milosavljevic Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: against P1274R0 add $ to identifier names Date: Wed, 17 Oct 2018 09:49:56 +0200 Lines: 138 Approved: news@gmane.org Message-ID: References: <1484cf21-8224-4fb8-457e-8c1e4a3121c2@gmail.com> <10926898.pV5Fg0ApEB@tjmaciei-mobl1> <341708ed-e98b-1744-fbdb-5b1036838323@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="00000000000065c3da057867eb56" X-Trace: blaine.gmane.org 1539762485 24564 195.159.176.226 (17 Oct 2018 07:48:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 17 Oct 2018 07:48:05 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDFYFDOFWUGBBMWTTPPAKGQEN3FDSXY@isocpp.org Wed Oct 17 09:48:01 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm1-f69.google.com ([209.85.128.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gCgYj-0006HN-G3 for gclcip-std-proposals@m.gmane.org; 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[209.85.220.41]) by mx.google.com with SMTPS id g184-v6sor718411wmf.24.2018.10.17.00.50.10 for (Google Transport Security); Wed, 17 Oct 2018 00:50:10 -0700 (PDT) Received-SPF: pass (google.com: domain of dmilos@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:a1c:1804:: with SMTP id 4-v6mr1568947wmy.29.1539762609831; Wed, 17 Oct 2018 00:50:09 -0700 (PDT) In-Reply-To: <341708ed-e98b-1744-fbdb-5b1036838323@gmail.com> X-Original-Sender: dmilos@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=apfMVtQv; spf=pass (google.com: domain of dmilos@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dmilos@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:40586 Archived-At: --00000000000065c3da057867eb56 Content-Type: text/plain; charset="UTF-8" Yacc( https://en.wikipedia.org/wiki/Yacc ) use that symbol. I do not like to see $ in C++. Nicolas Lesser >> Yeah, but itwas shot down because apparently a lot of people use $ inside of auto generated C++ or something like that std::cout << true << std::endl; On Tue, Oct 16, 2018 at 8:48 PM Matthew Woehlke wrote: > On 16/10/2018 14.32, Nicolas Lesser wrote: > > On Tue, Oct 16, 2018 at 8:33 PM Thiago Macieira wrote: > >> If we allowed > >> > >> if (empty?(y)) > >> > >> then the parser would need to know that it's not a case of the ternary > >> operator, so it needs to parse a lot before coming to that conclusion. > > > > Not really. There is still the "max-munch" rule. Which is why that would > > break a bit of code. Your above snippet would be ill-formed with the > > change, as there is a colon without condition operator. > > If you're saying (as I think you are) that keeping the grammar sane > would mean that an existing identifier followed by `?` with no > intervening whitespace would, under the proposal, include the `?` as > part of the identifier, I think that's a clear non-starter. I'd be > surprised if there isn't a non-trivial amount of existing code that > would be broken by such a change. > > Something else that just occurred to me... at least in the absence of > non-ASCII characters, C++ identifiers all match /\w+/. Changing that > could have interesting ramifications... > > -- > Matthew > > -- > 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/341708ed-e98b-1744-fbdb-5b1036838323%40gmail.com > . > -- 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/CAEfefmwYXdWu1EfYxBmkxbN%3Dn-3WpWqqWx0ApR9DNdgQky-NFA%40mail.gmail.com. --00000000000065c3da057867eb56 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Yacc( <= a href=3D"https://en.wikipedia.org/wiki/Yacc">https://en.wikipedia.org/wiki= /Yacc ) use that symbol.

I do not = like to see $=C2=A0in C++.

Nicolas Lesser >>= =C2=A0Yeah, but itwas shot down because apparently a lot of people use $ i= nside of auto generated C++ or something like that
std::cout << true << std::endl;
=

On = Tue, Oct 16, 2018 at 8:48 PM Matthew Woehlke <mwoehlke.floss@gmail.com> wrote:
On 16/10/2018 14.32, Nicolas Lesser wrote:
> On Tue, Oct 16, 2018 at 8:33 PM Thiago Macieira wrote:
>> If we allowed
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (empty?(y))
>>
>> then the parser would need to know that it's not a case of the= ternary
>> operator, so it needs to parse a lot before coming to that conclus= ion.
>
> Not really. There is still the "max-munch" rule. Which is wh= y that would
> break a bit of code. Your above snippet would be ill-formed with the > change, as there is a colon without condition operator.

If you're saying (as I think you are) that keeping the grammar sane
would mean that an existing identifier followed by `?` with no
intervening whitespace would, under the proposal, include the `?` as
part of the identifier, I think that's a clear non-starter. I'd be<= br> surprised if there isn't a non-trivial amount of existing code that
would be broken by such a change.

Something else that just occurred to me... at least in the absence of
non-ASCII characters, C++ identifiers all match /\w+/. Changing that
could have interesting ramifications...

--
Matthew

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