220 24330 article Path: news.gmane.org!not-for-mail From: Oliver Kowalke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: [tuple] extracting tuples out of a tuple Date: Fri, 12 Feb 2016 08:34:36 +0100 Lines: 73 Approved: news@gmane.org Message-ID: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=089e011762d120f0f8052b8db453 X-Trace: ger.gmane.org 1455262502 17920 80.91.229.3 (12 Feb 2016 07:35:02 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 12 Feb 2016 07:35:02 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCLZHP5J7MHRBIEW622QKGQECXF4UCQ@isocpp.org Fri Feb 12 08:34:58 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qg0-f72.google.com ([209.85.192.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aU8Fm-0005ft-JN for gclcip-std-proposals@m.gmane.org; Fri, 12 Feb 2016 08:34:58 +0100 Original-Received: by mail-qg0-f72.google.com with SMTP id b67sf68623058qgb.0 for ; Thu, 11 Feb 2016 23:34:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:from:date:message-id:subject:to:content-type :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=jgvN2brsTOrEDmJl084QY3oPq3KrUxVmKDqJeXprAqE=; b=sCP8AhOgO8jUhjjxVmWCg77ZILYhNgNKHjQ3tlvT9ofoarRFhRcG5mRNH7qJ2RfQg9 htquIHqhUd3Zju8Gu6/3S7HkTgHgkhOF3w99+rz/+VQBfmJMClGW0Q55ymwTJGeC58PS Oeb3CcjVdDcoKg/EZlhGCSfxluVRXLcFUVpRoExDR7gzmg8SMx/j7YSDnIkySoxfz5dV FpBlhmTi/sCLlKa4OFURYSFtzYy8OsZmBuMD08cZAaQ69Wc5duT7fl00BDuyHT5uxnPi 8NSFLsmv0xGfHlTVQZrp+s+L7PefvjD3dIsxDjfURBSinHarC99DLJjEsorK55bIkLO8 tE5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to :content-type: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=jgvN2brsTOrEDmJl084QY3oPq3KrUxVmKDqJeXprAqE=; b=hx8Vux+Isu+k7hZfmngzke2tzVPws8dYW6PUEjgNae9J7ZUnYO57+9+KCi7fMHKsf6 6bDW5bnexwr1ZKCRe0pUuCRH7Wp5v63x0i7aXLbLmGNhbaqi4EnG7Xs6xbtIVy6l8YTB 8B54xl3PuO8SK2Xyie+W9neP8OCUmdXDntFA5ZTX6502rUJp62N3FrDomB+QUB8r3f7d rnfbPN1CGQJIf2uXotZK7jyMKY3yOFzW4UB+XJondz0DlJGovbWDiVSUZ/fa1y5II4p4 cvEbzp+/HmZk+iejh/ZMXBuH8XfU9yUi2ToJ9hSJ3ZgqeLTz9k+UVW0T/i4YZiwbIL+h tjrA== X-Gm-Message-State: AG10YOSBK9560gN+yRPUOanWI27K85mlElJowN754Vth/bdeoSzLj7SixNT5BwfdVs1lYA== X-Received: by 10.129.25.212 with SMTP id 203mr36679ywz.35.1455262497827; Thu, 11 Feb 2016 23:34:57 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.29.194 with SMTP id m2ls788176obh.0.gmail; Thu, 11 Feb 2016 23:34:56 -0800 (PST) X-Received: by 10.202.169.198 with SMTP id s189mr40180oie.35.1455262496560; Thu, 11 Feb 2016 23:34:56 -0800 (PST) Original-Received: from mail-ob0-x234.google.com (mail-ob0-x234.google.com. [2607:f8b0:4003:c01::234]) by mx.google.com with ESMTPS id e4si13679311obn.90.2016.02.11.23.34.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Feb 2016 23:34:56 -0800 (PST) Received-SPF: pass (google.com: domain of oliver.kowalke@gmail.com designates 2607:f8b0:4003:c01::234 as permitted sender) client-ip=2607:f8b0:4003:c01::234; Original-Received: by mail-ob0-x234.google.com with SMTP id xk3so109667573obc.2 for ; Thu, 11 Feb 2016 23:34:56 -0800 (PST) X-Received: by 10.60.178.180 with SMTP id cz20mr54534oec.15.1455262495976; Thu, 11 Feb 2016 23:34:55 -0800 (PST) Original-Received: by 10.76.26.82 with HTTP; Thu, 11 Feb 2016 23:34:36 -0800 (PST) X-Original-Sender: oliver.kowalke@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of oliver.kowalke@gmail.com designates 2607:f8b0:4003:c01::234 as permitted sender) smtp.mailfrom=oliver.kowalke@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-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:24330 Archived-At: --089e011762d120f0f8052b8db453 Content-Type: text/plain; charset=UTF-8 In one project I've had the need for extracting tuples from the head/tail of a given tuple. Looking at cppreference.com it seams such functions are not part of the standard yet. Does a proposal exist that deals with this topic? I would suggest something like: std::tuple< int, std::string, std::string, double > tpl{ -1, "abc", "xyz", ..5 }; std::tuple< int, std::string, std::string > tpl1; std::tuple< std::string, double > tpl2; head( tpl1) = tpl; tail( tpl2) = tpl; split( tpl1, tpl2) = tpl; Oliver -- --- 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/. --089e011762d120f0f8052b8db453 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
In one project I've had the need for extract= ing tuples from the head/tail of a given tuple.
Looking at cppreference.com it seams su= ch functions are not part of the standard yet.
Does a proposa= l exist that deals with this topic?

I would suggest= something like:

std::tuple< int, std::string, std::string, dou= ble > tpl{ -1, "a= bc", "xyz", .5 };
std::tuple< int, std::string, std::string > = tpl1;
std::tu= ple< std::string, double > tpl2;

head( tpl1) =3D tpl;
tail( t= pl2) =3D tpl;
split( tpl1, tpl2) =3D tpl;

Oliv= er

--

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