220 31909 article Path: news.gmane.org!.POSTED!not-for-mail From: Vitali Lovich Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: This variable should not be named: an identifier (not) to remember Date: Thu, 30 Mar 2017 21:40:03 +0000 Lines: 131 Approved: news@gmane.org Message-ID: References: <985b9b2a-c734-45eb-95f4-db4dc0d309a1@isocpp.org> <2235919.4GAIbDEcRC@tjmaciei-mobl1> <3760122.IY8cFr858X@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11398d6ccc7b46054bf989df X-Trace: blaine.gmane.org 1490910054 2735 195.159.176.226 (30 Mar 2017 21:40:54 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 30 Mar 2017 21:40:54 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCFIZX46Q4HRBXPW6XDAKGQEG6CPSIA@isocpp.org Thu Mar 30 23:40:49 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pg0-f72.google.com ([74.125.83.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ctho9-0007xe-9A for gclcip-std-proposals@m.gmane.org; Thu, 30 Mar 2017 23:40:41 +0200 Original-Received: by mail-pg0-f72.google.com with SMTP id 79sf59062512pgf.2 for ; Thu, 30 Mar 2017 14:40:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to: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=rHHb26mVOnwTwhe6IExPnaOe13TFmyA0jH3zDYjHrIg=; b=rbiKki5+kUfR8GUBipyAzwPeG0rYMfMkpky4lxee1DaW/iOZkwpkQaaTPtEk+gCI4h M2x1/hI43TNHf7piVsvpLn42DK+hfwuZTiB+nPQN1yGMecbtm3BGU0vQjqRZl8vWsm+h z8Iw1GUZNTQYJ4GaJmAfvozjI5+0Y+R0O0yLxoX9iWCksKAESl5Q2K+T7ySm2NKKRU79 5tQlNE5V2FSF1k4uirUUhsAG33M4FKd6IPWYB7RGM9HmZDlXyAwPSXOF7TK0UBiXv1QJ +c6ohODZaRJC+drEoqdAp407wT3w8ZQCQL62Djzf4wRVwq4WT7TkL0+BnqloH5GA7Bgv M3yQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to: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=rHHb26mVOnwTwhe6IExPnaOe13TFmyA0jH3zDYjHrIg=; b=RbrJX3/GRVAUtT4lVPs71hcgLLKARtLkcEDhISMcvBnvsDO76drCu/YXam9JQ3Wbln TiQrSYL79YbLP5eVUwN+y6V3CvTBpvbGW/QdlpeOfXX8wlfpcswVt3jhQ3WUDKvzCnYm H40/2SO4J9YSMt279ECEP4RzlW7T1SQ2yukS7iBdlaiBPbUyBLh+n0sr0PREfcGNxJo/ J5nMeuGfEjmtT4/qKy3gu43akmye3ATiC2QX6BwxMPQWsKNFWYOJ/m1adPk8e61QKUWJ co1zHQD/DjDOvEh0wAu4KYv6tKShCAkU5fKpQVMVUv5J2rzeAD3cRbC9bwljdUfAjalA 61AA== X-Gm-Message-State: AFeK/H2o/6zdff8uvaWjDenlnMM69fwtj9xf6pXD8qjow7EnBcRMuwX8O5bHRuaQaoMhoA== X-Received: by 10.99.54.204 with SMTP id d195mr615814pga.120.1490910046428; Thu, 30 Mar 2017 14:40:46 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.19.61 with SMTP id f58ls1222193ote.36.gmail; Thu, 30 Mar 2017 14:40:45 -0700 (PDT) X-Received: by 10.157.35.107 with SMTP id k40mr1344931otd.129.1490910045676; Thu, 30 Mar 2017 14:40:45 -0700 (PDT) Original-Received: from mail-oi0-x236.google.com (mail-oi0-x236.google.com. [2607:f8b0:4003:c06::236]) by mx.google.com with ESMTPS id t45si1698236ote.64.2017.03.30.14.40.45 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 30 Mar 2017 14:40:45 -0700 (PDT) Received-SPF: pass (google.com: domain of vlovich@gmail.com designates 2607:f8b0:4003:c06::236 as permitted sender) client-ip=2607:f8b0:4003:c06::236; Original-Received: by mail-oi0-x236.google.com with SMTP id b187so44142763oif.0 for ; Thu, 30 Mar 2017 14:40:45 -0700 (PDT) X-Received: by 10.157.46.84 with SMTP id c20mr1348434otd.190.1490910014370; Thu, 30 Mar 2017 14:40:14 -0700 (PDT) In-Reply-To: <3760122.IY8cFr858X@tjmaciei-mobl1> X-Original-Sender: vlovich@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of vlovich@gmail.com designates 2607:f8b0:4003:c06::236 as permitted sender) smtp.mailfrom=vlovich@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:31909 Archived-At: --001a11398d6ccc7b46054bf989df Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable tuple, string_view> getstr() The 2nd argument is a view into the string owned by shared_ptr. The semantics of whether or not the string view points to owned memory depends on the lifetime of the shared_ptr and my understanding of what you were saying is that the lifetime changes depending on whether the get() is done or ignored. On Wed, Mar 29, 2017 at 9:12 PM Thiago Macieira wrote= : > On quarta-feira, 29 de mar=C3=A7o de 2017 20:41:37 PDT Vitali Lovich wrot= e: > > > It does not, so it cannot have an observable effect. > > > > doesnt it? If a function returns a Shared_ptr of a string and string_vi= ew > > that references the string, if you do: > > Can you be more specific what this function returns? "A shared_ptr of a > string > and a string_view" does not make sense, since shared_ptr only takes one > template parameter. > > I'll analyse the rest when you post your reply. > > -- > Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org > Software Architect - Intel Open Source Technology Center > > -- > 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/3760122.IY8c= Fr858X%40tjmaciei-mobl1 > . > --=20 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 e= mail 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/CAF8PYMgR_%3DQtP094%2BZyER%3DymjZQ_TmtbU7eYYh9wL= WDV-FmzJw%40mail.gmail.com. --001a11398d6ccc7b46054bf989df Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
tuple<shared_ptr<string>, string_view> getstr()
=
The 2nd argument is a view into the string owned by shared_p= tr.

The semantics of whether or not the string vie= w points to owned memory depends on the lifetime of the shared_ptr and my u= nderstanding of what you were saying is that the lifetime changes depending= on whether the get() is done or ignored.

On Wed, Mar 29, 2017 at 9:12 PM Thiago Macieira <thiago@macieira.org> wrote:
On quarta-feira, 29 de mar=C3=A7o de 2017 20:4= 1:37 PDT Vitali Lovich wrote:
> > It does not, so it cannot have an observable effect.
>
> doesnt it? If a function returns a Shared_ptr of a string and string_v= iew
> that references the string, if you do:

Can you be more specific what this function returns? "A shared_ptr of = a string
and a string_view" does not make sense, since shared_ptr only takes on= e
template parameter.

I'll analyse the rest when you post your reply.

--
Thiago Macieira - thiago (AT) macieira.info - thiago (AT= ) kde.org
=C2=A0 =C2=A0Software Architect - Intel Open Source Technology Center

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