220 18081 <0bb1cbcf-57bf-40c0-b91e-c1e52ad91fc6@isocpp.org> article Path: news.gmane.org!not-for-mail From: Matthew Fioravante Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Parsing Numbers Date: Wed, 20 May 2015 16:04:00 -0700 (PDT) Lines: 118 Approved: news@gmane.org Message-ID: <0bb1cbcf-57bf-40c0-b91e-c1e52ad91fc6@isocpp.org> References: <555CDDEF.8000002@gmx.net> <555CEC78.1000208@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_4341_1967694562.1432163040682" X-Trace: ger.gmane.org 1432163045 29649 80.91.229.3 (20 May 2015 23:04:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 20 May 2015 23:04:05 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDELF54RTIGRBYNF6SVAKGQEYB5UQYY@isocpp.org Thu May 21 01:04:05 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yk0-f200.google.com ([209.85.160.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YvD1u-0006dv-Lt for gclcip-std-proposals@m.gmane.org; Thu, 21 May 2015 01:04:02 +0200 Original-Received: by ykft189 with SMTP id t189sf49399274ykf.0 for ; Wed, 20 May 2015 16:04:01 -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 :content-type:x-original-sender:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=3861dbVp2Z1SNqltPI0/2RyULLa6GUwuZ18CqDoF0DU=; b=fAvbfKKMNvlcQm7orhBmXBH/Uk2zLCNbsozl23PAJ3Xmr7BVNdL3D3mp0KKh9GD6Ji zH/F1N+O/TKA3YJ7cRAA+WUFxhUL9Um2QT6xKMRWCWYokHA7E28DM8XoCg6G6LbHQU/C fgTDHeP66/ra9myqtLUsgzwc7z6MQDw9RXicBI8nBtMuwCiyZBysdpDPh+IlEqG/Wx2l H1Ukgez1qjQx3sfEGHMFVwCSUkZkAYhxH37lUO7HxH1dHk5//4xRmPgvW5MRza9shCMG jwWRV2qfCHqUkf/VLow0J7W3gXcSOW/ewEqxx+hX0p4yiDsW2OGK4yvGZiZt6pcRdXR/ I50w== 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:content-type:x-original-sender:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=3861dbVp2Z1SNqltPI0/2RyULLa6GUwuZ18CqDoF0DU=; b=MU/DXIbhMgnRJwI69lrmgHZwiC7ucgvdDUW1IN6z91CYMrZ0siTQxGBVe8Tm1FcFG5 IFi6C7DY0Bc2VLq909jFCCvhv1vaw35Ds/Cl5XUIxHj4NdnDFlbYQ7BCsOwLtTO0VzUL EPTe/W0gvisRaeCQx1CvPuQ0J8Qf1mZCb7UQhCk/xYXi2BW18NmZGjAlvsazj2oNjDac zeSUAwQI5m/ZYc1rdkY/Nlh1BGcaD/xl5VSoIOsFwM1kf4jLZ0fjLKFElwHL9nFyFR2a cYVSpvnpzEeJLucBoof3Bu9g72SPFhKiGDlhsHZXTKt7hkyEAComASuw5raRa0OQ+Tq5 xYQQ== X-Gm-Message-State: ALoCoQmbz+qB36c5lI6MvhMLrmzotOCIJ0vonuUK/FhVQTt+x7HEB/cTFfXcEhsbaxNmdlbeXi0U X-Received: by 10.236.29.51 with SMTP id h39mr50568379yha.12.1432163041920; Wed, 20 May 2015 16:04:01 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.108.7 with SMTP id i7ls1158122qgf.62.gmail; Wed, 20 May 2015 16:04:01 -0700 (PDT) X-Received: by 10.140.81.144 with SMTP id f16mr367753qgd.9.1432163041399; Wed, 20 May 2015 16:04:01 -0700 (PDT) In-Reply-To: X-Original-Sender: fmatthew5876@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:18081 Archived-At: ------=_Part_4341_1967694562.1432163040682 Content-Type: multipart/alternative; boundary="----=_Part_4342_916581008.1432163040691" ------=_Part_4342_916581008.1432163040691 Content-Type: text/plain; charset=UTF-8 On Wednesday, May 20, 2015 at 6:55:11 PM UTC-4, Matthew Woehlke wrote: > > On 2015-05-20 14:28, Matthew Fioravante wrote: > > On Wednesday, May 20, 2015 at 12:29:51 PM UTC-4, Vicente J. Botet > Escriba > > wrote: > > > >> Not yet there, but I would find quire readable to assign multiple > values > >> and even declare them in situ as well > >> > >> {auto a, str} = parse(str); > >> > >> {auto c, ignore} = parse(str); > > > > Its quite a different proposal, but I think a syntax like this is badly > > needed. > > Agreed. Unfortunately it came up before and IIRC did not get very far. > > Nit: I think it would be good to allow a declaration 'void' (that is, no > name) to ignore a value. Example: > > [auto result, void] = parse(str); > +1 must better than std::ignore. But we are off topic! :) On Wednesday, May 20, 2015 at 7:00:03 PM UTC-4, Jeffrey Yasskin wrote: > > There's a significant risk here that if the proposal is too > complicated, nothing will get accepted. > > That's my biggest fear as well, and also the reason why the last 2 threads about this died with no action. Even if the standard version is pretty simple its very easy to write your favorite flavor of wrapper ontop of it. -- --- 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_4342_916581008.1432163040691 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Wednesday, May 20, 2015 at 6:55:11 PM UTC-4, Ma= tthew Woehlke wrote:
On 2015-05= -20 14:28, Matthew Fioravante wrote:
> On Wednesday, May 20, 2015 at 12:29:51 PM UTC-4, Vicente J. Botet = Escriba=20
> wrote:
>=20
>> Not yet there, but I would find quire readable to assign multi= ple values=20
>> and even declare them in situ as well
>>
>> {auto a, str} =3D parse<int>(str);=20
>>
>> {auto c, ignore} =3D parse<int>(str);
>
> Its quite a different proposal, but I think a syntax like this is = badly=20
> needed.

Agreed. Unfortunately it came up before and IIRC did not get very far.

Nit: I think it would be good to allow a declaration 'void' (that is, n= o
name) to ignore a value. Example:

  [auto result, void] =3D parse<int>(str);

+1 must better than std::ignore.

But we ar= e off topic! :)

On Wednesday, May 20, 2015 at 7:00:03 PM UTC-= 4, Jeffrey Yasskin wrote:
There= 's a significant risk here that if the proposal is too
complicated, nothing will get accepted.

That's my biggest fear as well, and also the reason w= hy the last 2 threads about this died with no action. Even if the standard = version is pretty simple its very easy to write your favorite flavor of wra= pper ontop of it.

--

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