220 31804 article Path: news.gmane.org!.POSTED!not-for-mail From: Alberto Barbati Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: This variable should not be named: an identifier (not) to remember Date: Tue, 28 Mar 2017 11:23:55 +0200 Lines: 103 Approved: news@gmane.org Message-ID: References: <985b9b2a-c734-45eb-95f4-db4dc0d309a1@isocpp.org> <7EF863A1-1454-4116-9164-676FF19BF923@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a114e5364e385ce054bc704b2 X-Trace: blaine.gmane.org 1490693046 8064 195.159.176.226 (28 Mar 2017 09:24:06 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 28 Mar 2017 09:24:06 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCPY5DV6RIMBBLGX5DDAKGQEXMU4ITI@isocpp.org Tue Mar 28 11:24:01 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ot0-f197.google.com ([74.125.82.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1csnLz-0000fT-BA for gclcip-std-proposals@m.gmane.org; Tue, 28 Mar 2017 11:23:51 +0200 Original-Received: by mail-ot0-f197.google.com with SMTP id u47sf61323907ota.4 for ; Tue, 28 Mar 2017 02:23:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject: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=6LbswMHCOKeUyUXKuwP3ZZ3RjJW/M+BgwtzXfSg+/K8=; b=UUbf/EGMMdj67IC2tqkmbrQWqgm48cAmDEEGd2Urk67VaWVPnJk3gqc+3yvVQ7+TzP MxOSqW70FTtG4YOUCzvo9tLZjto+2qtuxLlUl2EwexpC+oO7DMkY282Hru/P0yek+A5W B1GCY7st8l1FWWvg9zPgY2GHi8GphNZc8crg2dCnPIr4W9yc6hDzatAaEMoDR5z14YZc Ae5gk/ykYlqfy4Q9z7DA7yj+9NW4wIuGWwjyPceejsbVI3oDAbeETeq57cBVWbVT5sVo ae7FRfixs45Bx3pT7U8KUulXtOXWZBWRBNF5mYur76IIruDjxvH3yNJo/lut7+sFo/Tx VEsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject: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=6LbswMHCOKeUyUXKuwP3ZZ3RjJW/M+BgwtzXfSg+/K8=; b=phjkQYlSUqg+Xk2k/otI/pg6R4qW3Xi8T9K7Jy4/YqcCDBZCn3y/lrym2spEdjE17U hGed+PPvCLGPPHidl5KCP/kEgW/vZFGj7EUdNOvC0McJe5rdRCZigi2jxyGLVLYCksp4 7lALmyPeK08pOFpdSGZ8P1s79aDYz2ypteOR3Jx3Bbo8mhztFL/6Y+jEat+Li/AJkN1E XlntEORKvxUqvXcYkrsXCEIKpoj4YJ5r36VwLFSZB3f/XjPIyjINAWMuJvCgeReJowIb mOY/j1ZGQaXuSx4SUMtVXKnPDhId8sQyBLDtWB8eStm/kjMVBTp10ibl4SHMNPS2mFhi F7yA== X-Gm-Message-State: AFeK/H3Psgpaux4TCXK9ZvtDeVOhq3Yt0thCArCGJfuII2MwHSshp72CWbhCVoKhgvRqxA== X-Received: by 10.157.11.2 with SMTP id a2mr5531021ota.51.1490693037303; Tue, 28 Mar 2017 02:23:57 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.56.80 with SMTP id r16ls2143974otd.15.gmail; Tue, 28 Mar 2017 02:23:56 -0700 (PDT) X-Received: by 10.31.165.11 with SMTP id o11mr1220973vke.4.1490693036605; Tue, 28 Mar 2017 02:23:56 -0700 (PDT) Original-Received: from mail-vk0-x233.google.com (mail-vk0-x233.google.com. [2607:f8b0:400c:c05::233]) by mx.google.com with ESMTPS id x127si1448708vkb.62.2017.03.28.02.23.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 Mar 2017 02:23:56 -0700 (PDT) Received-SPF: pass (google.com: domain of albertobarbati@gmail.com designates 2607:f8b0:400c:c05::233 as permitted sender) client-ip=2607:f8b0:400c:c05::233; Original-Received: by mail-vk0-x233.google.com with SMTP id z204so81282281vkd.1 for ; Tue, 28 Mar 2017 02:23:56 -0700 (PDT) X-Received: by 10.31.88.1 with SMTP id m1mr1692703vkb.140.1490693036144; Tue, 28 Mar 2017 02:23:56 -0700 (PDT) Original-Received: by 10.176.74.93 with HTTP; Tue, 28 Mar 2017 02:23:55 -0700 (PDT) In-Reply-To: X-Original-Sender: AlbertoBarbati@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of albertobarbati@gmail.com designates 2607:f8b0:400c:c05::233 as permitted sender) smtp.mailfrom=albertobarbati@gmail.com; dmarc=pass (p=NONE sp=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:31804 Archived-At: --001a114e5364e385ce054bc704b2 Content-Type: text/plain; charset=UTF-8 2017-03-28 11:08 GMT+02:00 Viacheslav Usov : > On Tue, Mar 28, 2017 at 8:22 AM, Alberto Barbati > wrote: > > > Thanks a lot for the pointer! Whoa! This issue is ancient... I'll make > sure the next version will have a reference to it and address the concerns > it raises. > > This keeps coming back to this forum. For example, this: > https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/ > G8WC37LVAAAJ > > My take on this is that we should have an operator or a keyword that > extends the lifetime of a temporary, as discussed here > https://groups.google.com/a/isocpp.org/d/msg/std- > proposals/ioi76TkG6g4/bdUinF-3AQAJ and subsequent posts, notably this > https://groups.google.com/a/isocpp.org/d/msg/std- > proposals/ioi76TkG6g4/bdUinF-3AQAJ and this https://groups.google. > com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/5JrGmugAAgAJ > Thanks for taking the time to collect these links, I will have a look at them. As for having a keyword to extend the lifetime of a temporary, there is a formal proposal for that (http://wg21.link/p0577), which I referenced in my draft. However I believe P0577 does not address the issue of decomposition declarations and has a greater syntactic cost (it re-uses the "register" keyword). It's true that P0577 provides additional use cases, though, but I am yet to be convinced of their usefulness. Alberto -- 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/CAF3xnJSBMmyno-AksyJJz5W%3DK4J%3DuY-ynYys3%2Bv%3Dmf5EzCp07w%40mail.gmail.com. --001a114e5364e385ce054bc704b2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
2017= -03-28 11:08 GMT+02:00 Viacheslav Usov <via.usov@gmail.com>= :
O= n Tue, Mar 28, 2017 at 8:22 AM, Alberto Barbati <albertobarbati@gma= il.com> wrote:

> Thanks a lot for t= he pointer! Whoa! This issue is ancient... I'll make sure the next vers= ion will have a reference to it and address the concerns it raises.

This keeps coming back to this forum. For example,= this:=C2=A0https://groups.google.com/a/isocpp.org/d/msg/std-proposals/ioi76TkG6g4/G8WC37LVAAAJ<= /a>


Thanks for taking the time to collect these links, I w= ill have a look at them.

As for having a keyword to exten= d the lifetime of a temporary, there is a formal proposal for that (http://wg21.link/p0577), which I referenced= in my draft. However I believe P0577 does not address the issue of decompo= sition declarations and has a greater syntactic cost (it re-uses the "= register" keyword). It's true that P0577 provides additional use c= ases, though, but I am yet to be convinced of their usefulness.

Alberto

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