220 24334 article Path: news.gmane.org!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: [tuple] extracting tuples out of a tuple Date: Fri, 12 Feb 2016 12:11:24 -0500 Lines: 30 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1455297107 5808 80.91.229.3 (12 Feb 2016 17:11:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 12 Feb 2016 17:11:47 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC37LBFWUIFBBRNE7C2QKGQEZF7S7NA@isocpp.org Fri Feb 12 18:11:37 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f71.google.com ([209.85.215.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aUHFm-0000yW-Vc for gclcip-std-proposals@m.gmane.org; Fri, 12 Feb 2016 18:11:35 +0100 Original-Received: by mail-lf0-f71.google.com with SMTP id h66sf30538986lfb.0 for ; Fri, 12 Feb 2016 09:11:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=to:from:subject:date:lines:message-id:references:mime-version :content-type:user-agent:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=uEycjbHwQVVbRWzv46FuZVZnIZH0/dhRnb3Y9qCnu68=; b=wj4MA1hn8/twpHJN7ktri0P9H24aoFj9bwVKQ/W7JwdBILvf1NkM8mlmR5B5QWB0MA 2viEXf2+qr69pvMNXN63KEP6puTXdfC9ebe7B1A460ZVClyITRmQjwYZ0hjSmS2H/UxG u1FO4Lv9F3HbJpcvgxHd6CHr0NJHLY4l1JOK+aI2dTk7FqnFA6RfOncWTKrli6ug2nqA PNvc9u2UUgMLxoAS5Vg5ykpvFAjgkxbBYJ9UpsPQ9zTFu1wSF1niBdPVtHT1k8NBPGth OM2g9QTycHOLfVb+ZPbtAjxuiwzKpWRj2m2F8aMzVUjH+AQIyqFM1J8lBVyR45AY1P05 J6k X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:content-type:user-agent:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=uEycjbHwQVVbRWzv46FuZVZnIZH0/dhRnb3Y9qCnu68=; b=ituwLhanANalScbOKdgpKkDlQ1/tf9uD8PB+LVV2/3XU2FWwPS7DfDRmNnv9J4csPn ECOxYsXaoZYL9+8/LSPWSfUvdfrcp+QqgSZPGRL4g748benhjyqav3suflppWC3+Z433 Y32cJUXjBmKo7ZZyXBTaJCWq2knPsS77OpB0vVAs2Vo/bV083iC2bx9ZN3wB0tiJ524B pNs1yGNq8WB/GIejb0zIUAD4zkz/eOkrecdKTmpm3Y+x19axGIjvTKLNxfttbr+MU9B/ p/2wQa7hbqqV/DYh2v2mRoi9vV6qKOk+NljaW3102sq82K3IS4IYYmkwhsohswcmbGVH X-Gm-Message-State: AG10YORyWWO4qIc71zpA9NurEngZiLknLfGbXjCYlslKd212jJnYdMI6YwW75JFuKIigYQ== X-Received: by 10.112.54.202 with SMTP id l10mr432938lbp.14.1455297094608; Fri, 12 Feb 2016 09:11:34 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.25.152.136 with SMTP id a130ls383553lfe.33.gmail; Fri, 12 Feb 2016 09:11:32 -0800 (PST) X-Received: by 10.112.132.5 with SMTP id oq5mr1096527lbb.16.1455297092649; Fri, 12 Feb 2016 09:11:32 -0800 (PST) Original-Received: from plane.gmane.org (plane.gmane.org. [80.91.229.3]) by mx.google.com with ESMTPS id n31si7388671lfi.118.2016.02.12.09.11.32 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 12 Feb 2016 09:11:32 -0800 (PST) Received-SPF: pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) client-ip=80.91.229.3; Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1aUHFj-0000vZ-Jg for std-proposals@isocpp.org; Fri, 12 Feb 2016 18:11:31 +0100 Original-Received: from tripoint.kitware.com ([66.194.253.20]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 12 Feb 2016 18:11:31 +0100 Original-Received: from mwoehlke.floss by tripoint.kitware.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 12 Feb 2016 18:11:31 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 21 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: tripoint.kitware.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 In-Reply-To: X-Original-Sender: mwoehlke.floss@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) smtp.mailfrom=gclcip-std-proposals@m.gmane.org; dmarc=fail (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-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:24334 Archived-At: On 2016-02-12 11:30, Oliver Kowalke wrote: > 2016-02-12 16:06 GMT+01:00 Matthew Woehlke : >> I'm not a fan of using magical references to do indirect assignment, >> i.e. any of your proposals, but especially `split`. All of these seem >> backwards, i.e. should be `tpl1 = head<3>(tpl);` instead. > > I've had std::tie() in mind, > > int i...; > X x...; > std::tie( i, x) = get_tuple(); That's also a horribly ugly interface that we shouldn't be perpetuating; http://wg21.link/p0144 solves that exact example ever so much better... At any rate, 'tie' is a much better name for a magic assignment helper... mainly, because the verb matches the actual action that is occurring (I could live with 'splice' more than 'split'). -- 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. Visit this group at https://groups.google.com/a/isocpp.org/group/std-proposals/. .