220 19955 <3183929.eXnTES4BH3@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Address of a reference: determining the value category of what it refers? Date: Fri, 21 Aug 2015 19:24:47 -0700 Lines: 56 Approved: news@gmane.org Message-ID: <3183929.eXnTES4BH3@tjmaciei-mobl4> References: <76fe342f-3342-4355-af20-1c41b21e54aa@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1440210307 29544 80.91.229.3 (22 Aug 2015 02:25:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 22 Aug 2015 02:25:07 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRB5V236XAKGQEXDDSS7A@isocpp.org Sat Aug 22 04:24:56 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f199.google.com ([209.85.217.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZSyUK-0000Ur-3W for gclcip-std-proposals@m.gmane.org; Sat, 22 Aug 2015 04:24:56 +0200 Original-Received: by lbcue2 with SMTP id ue2sf25098965lbc.1 for ; Fri, 21 Aug 2015 19:24:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:user-agent :in-reply-to:references:mime-version:content-transfer-encoding :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=hhBSHD8S79llOJ7zdJPO6eZBDLiws/fQ483jwO318Xg=; b=DG9T+L2zn/HlsgknKf2vLb4JvpFSM43pQIH270AzSlJvcl/FbEEqeuip77N96vJF8i QcZx35L92EOX8N3VXwtw3iGewl1lDkPHbO/lc1v8NpuolKPXuwacpnmgvd7OQNHieuRM BnTsvr2eTFx1zNuDwEk0CDzYbDKwMEiMhl89/esxdFBIkM9GcuK5q8GX8Fgk4knnZMco bJZ3mal7c7/OSrN/UDRo5RIbEUTPwQW3Q3VxcpW4LGfUaoP+8mv74V5/RVbSiI9uKc6E uesbOZw45mQi70DMuppJz0/7uqVHEasZ4xVsOdUvLHbTnpwIPOPWxWes8 X-Gm-Message-State: ALoCoQndv8HGFUXwUTPhiWY4kZBjoQ324L7429fAL5mB8ft5fJCOCAkSGPT/Swjmg1DXeD0GIBtb X-Received: by 10.112.140.195 with SMTP id ri3mr866820lbb.22.1440210295079; Fri, 21 Aug 2015 19:24:55 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.89.9 with SMTP id bk9ls444746wib.43.gmail; Fri, 21 Aug 2015 19:24:53 -0700 (PDT) X-Received: by 10.180.108.103 with SMTP id hj7mr11101651wib.11.1440210293614; Fri, 21 Aug 2015 19:24:53 -0700 (PDT) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id bi4si2593547wib.2.2015.08.21.19.24.52 for ; Fri, 21 Aug 2015 19:24:52 -0700 (PDT) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) client-ip=2a01:4f8:d13:f81:21c:14ff:fe01:12a3; Original-Received: from tjmaciei-mobl4.localnet (unknown [IPv6:2601:1c0:5803:81c9:40d2:14bc:2276:38b6]) by gondolin.macieira.info (Postfix) with ESMTPSA id D272C11A778 for ; Fri, 21 Aug 2015 19:24:50 -0700 (PDT) User-Agent: KMail/4.14.9 (Linux/4.1.3-1-desktop; KDE/4.14.9; x86_64; ; ) In-Reply-To: X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) smtp.mailfrom=thiago@macieira.org 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:19955 Archived-At: On Friday 21 August 2015 18:21:57 NDos Dannyu wrote: > 2015=EB=85=84 8=EC=9B=94 22=EC=9D=BC =ED=86=A0=EC=9A=94=EC=9D=BC =EC=98= =A4=EC=A0=84 10=EC=8B=9C 14=EB=B6=84 49=EC=B4=88 UTC+9, Richard Smith =EB= =8B=98=EC=9D=98 =EB=A7=90: > > That's not correct. "const int &rcr(0)" implicitly creates a temporary > > object of type int and binds the reference to that object. (The referen= ce > > binding then extends the lifetime of that temporary object to the lifet= ime > > of the reference.) >=20 > I'm speaking about what it means, not how it is implemented. Even if it = is > implemented as it refers to a temporary object, it should be treated as i= t > doesn't refer to an object, I mean. It means what Richard said: it refers to an object which has an address. Th= e=20 fact that it is temporary isn't relevant. And changing this now isn't a good idea. Not to mention that it can't be=20 implemented. Take, for example: int *doit(const int &ref) { printf("%d\n", ref); return &ref; } You're saying that the function doit above should return null if it was cal= led=20 with a reference to a temporary. But if it does so, how will it print the= =20 value that was referenced? Besides, we're missing an important aspect: why do you want this? What's th= e=20 motivation? --=20 Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center PGP/GPG: 0x6EF45358; fingerprint: E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 --=20 ---=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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. .