220 34224 article Path: news.gmane.org!.POSTED!not-for-mail From: Nevin Liber Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Idea: Extension of structured bindings to definition of structs Date: Wed, 30 Aug 2017 10:16:41 -0500 Lines: 71 Approved: news@gmane.org Message-ID: References: <59dcbbbc-c536-4b7b-9c88-0638fb0cd58a@technion.ac.il> <7b9bf263-d3ca-42bf-aed6-4c7606782a28@isocpp.org> <1762295.OciJaA9sdk@tjmaciei-mobl1> <74349bfe-bb5a-a2ce-4142-5d46103d1d9f@technion.ac.il> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="f403045c57dc47ac3d0557fa06cf" X-Trace: blaine.gmane.org 1504106246 5598 195.159.176.226 (30 Aug 2017 15:17:26 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 30 Aug 2017 15:17:26 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCE35H5S6IDBBA5OTPGQKGQEPPB75EI@isocpp.org Wed Aug 30 17:17:21 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pg0-f71.google.com ([74.125.83.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dn4k2-00013k-UG for gclcip-std-proposals@m.gmane.org; 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[2607:f8b0:400e:c00::241]) by mx.google.com with ESMTPS id 143si4410319pfc.482.2017.08.30.08.17.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 30 Aug 2017 08:17:22 -0700 (PDT) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 2607:f8b0:400e:c00::241 as permitted sender) client-ip=2607:f8b0:400e:c00::241; Original-Received: by mail-pf0-x241.google.com with SMTP id r187so4487372pfr.5 for ; Wed, 30 Aug 2017 08:17:22 -0700 (PDT) X-Received: by 10.84.215.205 with SMTP id g13mr2449966plj.233.1504106242352; Wed, 30 Aug 2017 08:17:22 -0700 (PDT) Original-Sender: nliber@gmail.com Original-Received: by 10.100.133.80 with HTTP; Wed, 30 Aug 2017 08:16:41 -0700 (PDT) In-Reply-To: <74349bfe-bb5a-a2ce-4142-5d46103d1d9f@technion.ac.il> X-Original-Sender: nevin@eviloverlord.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=TUzZX0A7; spf=pass (google.com: domain of nliber@gmail.com designates 2607:f8b0:400e:c00::241 as permitted sender) smtp.mailfrom=nliber@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:34224 Archived-At: --f403045c57dc47ac3d0557fa06cf Content-Type: text/plain; charset="UTF-8" On Wed, Aug 30, 2017 at 2:59 AM, Eyal Rozenberg wrote: > You would be using an unnamed struct for the same reason you use an > "unnamed type" for non-struct variables with auto. We write: > > auto x = expr; > Even though you don't spell it out, that type already has a name. auto doesn't create a new type. You are proposing yet another syntax to create a new type. As for its use, about the only thing you can do with it is pass it to a template function (or equivalent). That use seems fairly marginal. You need much better usage examples for motivation. -- Nevin ":-)" Liber +1-847-691-1404 -- 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/CAGg_6%2BMPQTnqdWLQ1UV8jF173jDXYQQx-abwwNV3v3iknocJ%3DQ%40mail.gmail.com. --f403045c57dc47ac3d0557fa06cf Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Wed, Aug 30, 2017 at 2:59 AM, Eyal Rozenberg <ey= alroz@technion.ac.il> wrote:
You would be using = an unnamed struct for the same reason you use an
"unnamed type" for non-struct variables with auto. We write:

=C2=A0 auto x =3D expr;

Even though you= don't spell it out, that type already has a name. =C2=A0auto doesn'= ;t create a new type.

You are proposing yet anothe= r syntax to create a new type.=C2=A0 As for its use, about the only thing y= ou can do with it is pass it to a template function (or equivalent).=C2=A0 = That use seems fairly marginal.=C2=A0 You need much better usage examples f= or motivation.
--
=C2=A0N= evin ":-)" Liber=C2=A0 <mailto:nevin@eviloverlord.com> =C2=A0+1-847-69= 1-1404

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