220 29697 <58499DED.3010506@gmail.com> article
Path: news.gmane.org!.POSTED!not-for-mail
From: Matthew Woehlke <mwoehlke.floss@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: Add a "tuple_slice" function in <tuple>
Date: Thu, 8 Dec 2016 12:52:45 -0500
Lines: 20
Approved: news@gmane.org
Message-ID: <58499DED.3010506@gmail.com>
References: <490cad18-4302-4350-976f-2bc394a1a350@isocpp.org>
 <583F4A4F.7020708@gmail.com>
 <945de37f-352d-008f-a29b-d354999c6c4c@wanadoo.fr>
 <5840659B.7050003@gmail.com>
 <fbfba60b-f7a7-2a41-6e09-0cbe7e6378c0@wanadoo.fr>
 <58419917.8000105@gmail.com>
 <b6286db3-251a-d59e-acf7-f5b1daa624bd@wanadoo.fr>
Reply-To: std-proposals@isocpp.org
NNTP-Posting-Host: blaine.gmane.org
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
X-Trace: blaine.gmane.org 1481219571 21734 195.159.176.226 (8 Dec 2016 17:52:51 GMT)
X-Complaints-To: usenet@blaine.gmane.org
NNTP-Posting-Date: Thu, 8 Dec 2016 17:52:51 +0000 (UTC)
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.1.0
To: std-proposals@isocpp.org
Original-X-From: std-proposals+bncBC37LBFWUIFBB353U3BAKGQEGJE32CA@isocpp.org Thu Dec 08 18:52:47 2016
Return-path: <std-proposals+bncBC37LBFWUIFBB353U3BAKGQEGJE32CA@isocpp.org>
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 <std-proposals+bncBC37LBFWUIFBB353U3BAKGQEGJE32CA@isocpp.org>)
	id 1cF2s8-0004TV-3Q
	for gclcip-std-proposals@m.gmane.org; Thu, 08 Dec 2016 18:52:44 +0100
Original-Received: by mail-yw0-f200.google.com with SMTP id t11sf550217424ywe.3
        for <gclcip-std-proposals@m.gmane.org>; Thu, 08 Dec 2016 09:52:48 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=isocpp-org.20150623.gappssmtp.com; s=20150623;
        h=subject:to:references:from:message-id:date:user-agent:mime-version
         :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=AabtOfsb9yVlt2jQH8wF3B90ba09POgZlxkByPKphyo=;
        b=0Ta/v9xCQrspY/ED2nlPIFTBm0oNn/ZU3fQw/5EaF9wHHNAhF1E7zEF1EFxJKYHoOv
         8I378K8gK4/WMA35VSrjkwG2d21atGnYR8lMYlwwPR+k6VySniLv3CF2actiZ0kF0avT
         prgqOdv3m5/Tqje0UZtZxTrle8TZLpbh4hu4u7ihD9bNgYhBmEOLLcrfwL9SwI8iQlYl
         mqfGzsjWwf6ofkEGTVts7D3HThDrdKcE5fkTFLkOD6RuBkLh5oOnzeJfSjDP4WurEjaV
         PZQMmJ+vKMKDFq3iZ3zW9WFhz2prMAdtpBn9TWMQSh+W9ACKzcnWMUZp2cEChYLDKyVT
         wvBQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20130820;
        h=x-gm-message-state:subject:to:references:from:message-id:date
         :user-agent:mime-version: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=AabtOfsb9yVlt2jQH8wF3B90ba09POgZlxkByPKphyo=;
        b=Q3n5flWOmSEhqUDagHXtMcKRscs2ykuZulxekAvTseGu25cxQgbxCUcqsiecOyPYWa
         nNdL00iGBl0dwSS1QCC7/2JfZm8tt2Umi10yQPShF0R0BGaHhUZfnmP93hf627YhUyYD
         E39ZzwcxPLO+bkjnWLBDFvBjon6+f7SGaVpBcJ9toKqRP5njO6hx+XDNpZCCu4vtoiE/
         edlho17+etvw33f7aU0Krx8iBXblJMfOWJWwNqOavH16osjUmEZZsH3r1S66zeJvRy54
         aRakbibDH+D5LiUJhN6MQRpFGDXeASDM8Z2iujOEoDoC1N1925IBXdly8A+54gXserul
         q0HQ==
X-Gm-Message-State: AKaTC03RxitGr/A950K+IHDe98PKmML4HwZArwRJhjJ/DCfG9lnuqRIW6QicBLRxu44OCQ==
X-Received: by 10.13.192.129 with SMTP id b123mr18494994ywd.77.1481219568151;
        Thu, 08 Dec 2016 09:52:48 -0800 (PST)
X-BeenThere: std-proposals@isocpp.org
Original-Received: by 10.157.26.102 with SMTP id u35ls6884990otu.4.gmail; Thu, 08 Dec
 2016 09:52:47 -0800 (PST)
X-Received: by 10.37.244.82 with SMTP id p18mr42256033ybe.176.1481219566967;
        Thu, 08 Dec 2016 09:52:46 -0800 (PST)
Original-Received: from mail-yw0-x234.google.com (mail-yw0-x234.google.com. [2607:f8b0:4002:c05::234])
        by mx.google.com with ESMTPS id b67si9113093ybi.14.2016.12.08.09.52.46
        for <std-proposals@isocpp.org>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Thu, 08 Dec 2016 09:52:46 -0800 (PST)
Received-SPF: pass (google.com: domain of mwoehlke.floss@gmail.com designates 2607:f8b0:4002:c05::234 as permitted sender) client-ip=2607:f8b0:4002:c05::234;
Original-Received: by mail-yw0-x234.google.com with SMTP id a10so327251254ywa.3
        for <std-proposals@isocpp.org>; Thu, 08 Dec 2016 09:52:46 -0800 (PST)
X-Received: by 10.13.219.74 with SMTP id d71mr68842378ywe.16.1481219566573;
        Thu, 08 Dec 2016 09:52:46 -0800 (PST)
Original-Received: from [192.168.1.173] (tripoint.kitware.com. [66.194.253.20])
        by smtp.googlemail.com with ESMTPSA id c126sm12072809ywf.45.2016.12.08.09.52.45
        for <std-proposals@isocpp.org>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Thu, 08 Dec 2016 09:52:45 -0800 (PST)
In-Reply-To: <b6286db3-251a-d59e-acf7-f5b1daa624bd@wanadoo.fr>
X-Original-Sender: mwoehlke.floss@gmail.com
X-Original-Authentication-Results: mx.google.com;       dkim=pass
 header.i=@gmail.com;       spf=pass (google.com: domain of
 mwoehlke.floss@gmail.com designates 2607:f8b0:4002:c05::234 as permitted
 sender) smtp.mailfrom=mwoehlke.floss@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: <std-proposals.isocpp.org>
X-Google-Group-Id: 399137483710
List-Post: <https://groups.google.com/a/isocpp.org/group/std-proposals/post>, <mailto:std-proposals@isocpp.org>
List-Help: <https://support.google.com/a/isocpp.org/bin/topic.py?topic=25838>, <mailto:std-proposals+help@isocpp.org>
List-Archive: <https://groups.google.com/a/isocpp.org/group/std-proposals/>
List-Subscribe: <https://groups.google.com/a/isocpp.org/group/std-proposals/subscribe>,
 <mailto:std-proposals+subscribe@isocpp.org>
List-Unsubscribe: <mailto:googlegroups-manage+399137483710+unsubscribe@googlegroups.com>,
 <https://groups.google.com/a/isocpp.org/group/std-proposals/subscribe>
Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:29697
Archived-At: <http://permalink.gmane.org/gmane.comp.lang.c++.isocpp.proposals/29697>

On 2016-12-05 16:21, Vicente J. Botet Escriba wrote:
> Maybe you are right. The problem I see is that functions cannot return
> parameter packs as them are no types and so this makes composition more
> difficult.

Yes, I can see where composition might make it desirable to have a
library feature in addition. This seems similar to the case where the
proposed feature does not entirely obviate the need for std::apply; it
just means that 90% of the time you will use the language feature, and
in some corner cases you will still use std::apply.

-- 
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.
To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/58499DED.3010506%40gmail.com.

.
