220 12136 article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Unpacking syntax for tuples using auto Date: Thu, 31 Jul 2014 07:22:28 +0800 Lines: 74 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_B6782DA9-EA82-41A4-B351-CEB567ED808F" X-Trace: ger.gmane.org 1406762567 12615 80.91.229.3 (30 Jul 2014 23:22:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 30 Jul 2014 23:22:47 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRBO744WPAKGQE367MR7Q@isocpp.org Thu Jul 31 01:22:38 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ig0-f198.google.com ([209.85.213.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XCdCf-0004Rl-IG for gclcip-std-proposals@m.gmane.org; Thu, 31 Jul 2014 01:22:37 +0200 Original-Received: by mail-ig0-f198.google.com with SMTP id h18sf9604279igc.1 for ; Wed, 30 Jul 2014 16:22:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:message-id:mime-version:subject:date :references:to:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=FclPToJxzvWBn8+T+9zrHL9BlEigQYGjthIQ5nL1b8g=; b=Ujwepyjo1EhgYIQ57+IIeHEr81OzbFn/MEtH6yoTdJb1simun2Rq7NXDHwkKFQPU8s dB5gX5+11HNCDG9m1r57J0CS1LCXy5osI3rsajpgByTlcMGD3vmcolx+qNCCjJ7lQS3k wPmw1H677U+NlfbNm0xOyJI+Pl3TFlCX+lYc1ekIzQINOYSgG2pjoQghLwDAqw7GWNEW 140bGFeMYm/4wJp/qxZw5CXTDJQxb192YjBvXyd8vZcvaIrfvQtd9eEjcsCV8E7s/Huk ARXfZyrU5qm/Tlxcx8V6ceWKd7L7cjFD6bMJNO1N6/858MwTbx9E2KKL2rIwqhM+f7c/ 3qRg== X-Gm-Message-State: ALoCoQmb1eYjeBZ0fvHYcT2PPsPb2br/DPE5MMbwXn/vbFIVDCBfl6fUbgtPYJelevGoLP655aav X-Received: by 10.182.33.35 with SMTP id o3mr123769obi.8.1406762556493; Wed, 30 Jul 2014 16:22:36 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.164.161 with SMTP id yr1ls1451797igb.36.gmail; Wed, 30 Jul 2014 16:22:35 -0700 (PDT) X-Received: by 10.51.17.2 with SMTP id ga2mr12951181igd.2.1406762555744; Wed, 30 Jul 2014 16:22:35 -0700 (PDT) Original-Received: from mail-ig0-x232.google.com (mail-ig0-x232.google.com [2607:f8b0:4001:c05::232]) by mx.google.com with ESMTPS id g8si9693776ica.90.2014.07.30.16.22.35 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 30 Jul 2014 16:22:35 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:4001:c05::232 as permitted sender) client-ip=2607:f8b0:4001:c05::232; Original-Received: by mail-ig0-f178.google.com with SMTP id uq10so3862777igb.5 for ; Wed, 30 Jul 2014 16:22:35 -0700 (PDT) X-Received: by 10.50.117.106 with SMTP id kd10mr12537390igb.5.1406762555611; Wed, 30 Jul 2014 16:22:35 -0700 (PDT) Original-Received: from [172.20.10.2] ([121.54.54.34]) by mx.google.com with ESMTPSA id z4sm14764219igp.14.2014.07.30.16.22.33 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 30 Jul 2014 16:22:35 -0700 (PDT) In-Reply-To: X-Mailer: Apple Mail (2.1878.6) X-Original-Sender: potswa@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@gmail.com designates 2607:f8b0:4001:c05::232 as permitted sender) smtp.mail=potswa@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=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:12136 Archived-At: --Apple-Mail=_B6782DA9-EA82-41A4-B351-CEB567ED808F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=ISO-8859-1 On 2014-07-30, at 10:29 PM, walter1234 wrote: > Would `struct` in an lvalue location work , directly analogous to the des= tructuring in rust, just with sequential access allowed to named structs (s= o they can be used like tuples in functional languages) >=20 > eg=20 >=20 > struct { auto x,auto y,auto z } =3D std::make_tuple(1,2.0,"three"); = //x=3D1, y=3D2.0, z=3D"three" Note, this is similar to a C11 anonymous structure in syntax and semantics.= The unpacked x, y, and z wouldn't need to be a new kind of entity. The "da= mage" would be contained to initialization semantics, and there might be sy= nergy with deduced class template arguments as well. --=20 ---=20 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 e= mail 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-proposa= ls/. --Apple-Mail=_B6782DA9-EA82-41A4-B351-CEB567ED808F Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1
On 2014&= ndash;07–30, at 10:29 PM, walter1234 <walter2bz@gmail.com> wrote:

Would `struct` in an lvalue location work , directly analo= gous to the destructuring in rust, just with sequential access allowed= to named structs (so they can be used like tuples in functional langu= ages)

eg 

 =  struct  { auto x,auto y,auto z } =3D std::make_tuple(1,2.0,"thr= ee");  //x=3D1, y=3D2.0, z=3D“three"

Note, this is similar to a C11 anonymous structure = in syntax and semantics. The unpacked x, y, and z wouldn’t need to be= a new kind of entity. The “damage” would be contained to initi= alization semantics, and there might be synergy with deduced class template= arguments as well.

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