220 31466 <8a0cf5fb-7a49-4cb0-95ba-c90583548303@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::visit for std::tuple Date: Mon, 6 Mar 2017 12:54:26 -0800 (PST) Lines: 80 Approved: news@gmane.org Message-ID: <8a0cf5fb-7a49-4cb0-95ba-c90583548303@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1681_2116514708.1488833666583" X-Trace: blaine.gmane.org 1488833670 17152 195.159.176.226 (6 Mar 2017 20:54:30 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 6 Mar 2017 20:54:30 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBA4Z67CQKGQEFY4WVTI@isocpp.org Mon Mar 06 21:54:25 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw0-f200.google.com ([209.85.161.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ckzeA-0003Y2-6k for gclcip-std-proposals@m.gmane.org; Mon, 06 Mar 2017 21:54:22 +0100 Original-Received: by mail-yw0-f200.google.com with SMTP id 204sf325945822ywo.6 for ; Mon, 06 Mar 2017 12:54:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Q1NZ5K2YsBYxN+9n4wXikscMseByXOikco9969Nond8=; b=WHzCz8tc6Ba5oeKDDq8bl41scicvK9BK6Vdan8ewr7FN+66HOsoCCLDI01Rzg+TwPv phh6Tk3liEsENmnogjTwnriVhKvtzjWtknv1lAQnKxYXVtL46GvpQ+/WU0e/d0Egc9Va +v5w/67YxvbKKene7MSsRCgTtrYzht1cZVjsyG3uJdO7Ep+F1c9mWwLIlMmNSefdytV+ SoIMAsDdknLduA07NfRc2OqBW+csIj/tP7P3hJ61UngldlK0mnrJDPE27ZgOC674Wh0E pSe4MRQooGOve4hKYx1JAIgpGlltIYe9OCWBHudX+CFop02zBaYTQbA6qKoEsVRxAtzK U8Tw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Q1NZ5K2YsBYxN+9n4wXikscMseByXOikco9969Nond8=; b=SzAEJQBBBVzHxALJpt9/ML52JZnfRD4sF5NGwRYk+ejfzk/v0FIcKrwOZ2LWqh+9F6 nSf8icqELg+XL2jTVy4dEcrIHkSLMbALqrkhn+Tx3Mf44cuyi9ishD1+bSU5mBha9UN9 Q/nKkT6lKqXqu4HRG4j3o2Ya/3YkYf4LxH8vvN29hgV27S6iQWlvbKiFH45MPwCACzlZ YgbffhjD2eIEXxtFjRJArr1d5eYWA138aMyVdogRMD7y5sVhXr2od6BGtsYLeNDBx6Ps eCVyNMmS8Bd3kAjEW/mw5CakLj5g3Q6q15ATVyBML+aZC6xDXPBP/m1SA8PdX2LbSqCt dieQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=Q1NZ5K2YsBYxN+9n4wXikscMseByXOikco9969Nond8=; b=SOAjngmFLQquceuVXMaKAsW9Zfp2NSfJIVkLu5iQtEsnRig3Blbs4IpKj1Ql91IVAz Nx7tDVElOJKT1+Ktbp/+hHdrZhy2LcXBwI41u5+D6TTEyj5gi9HAS8cDWOvK78qmwKT/ Ysc201OFlc09x+I7ceWhRH27IgEpE1vm4XKEw4L2sdNECi0grLvUDa+FYwyN1giZOJLe onHlcHQ6/AsjlqalUjFTIR6uTR0cppC3ChP+GSyQtxtPnkatzFAEH6Db9Aa0lnPu2NT/ z7LfchxD5n1jQQLtG0KMrjve5fU7VoFebHEDC+7eBGZE2d8xfaFpDSBPSlAZomv2zUPR P1uw== X-Gm-Message-State: AMke39mHZYj3X+mzHQr7MFgqzC+LQHqanCwMenb8jTVhbUQUyRuexbwG3enABT6tUsNGDA== X-Received: by 10.13.249.2 with SMTP id j2mr6623405ywf.86.1488833668006; Mon, 06 Mar 2017 12:54:28 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.7.195 with SMTP id 61ls16577779oto.31.gmail; Mon, 06 Mar 2017 12:54:27 -0800 (PST) X-Received: by 10.157.16.48 with SMTP id h45mr1314427ote.10.1488833667167; Mon, 06 Mar 2017 12:54:27 -0800 (PST) In-Reply-To: X-Original-Sender: jmckesson@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:31466 Archived-At: ------=_Part_1681_2116514708.1488833666583 Content-Type: multipart/alternative; boundary="----=_Part_1682_332301284.1488833666583" ------=_Part_1682_332301284.1488833666583 Content-Type: text/plain; charset=UTF-8 It seems to me that the generalized tuple unpacking proposal makes this all obsolete: auto t = std::make_tuple(100, "500", '!'); [](auto& x) { std::cout << x; }([:]t)...; -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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It seems to me that the generalized tuple unpacking proposal makes this all obsolete:

<= div style=3D"background-color: rgb(250, 250, 250); border-color: rgb(187, 1= 87, 187); border-style: solid; border-width: 1px; overflow-wrap: break-word= ;" class=3D"prettyprint">
auto t =3D std::make_tuple(100, &= quot;500", '!');
[](auto& x) { st= d::= cout << x; }([:]t)...;

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