220 11869 <52187852-ff8e-4e59-a8cf-7a29fd0a405b@isocpp.org> article Path: news.gmane.org!not-for-mail From: tomaszkam@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: N4078: Rvalue reference overloads for value() method returns object by value Date: Fri, 11 Jul 2014 03:57:20 -0700 (PDT) Lines: 63 Approved: news@gmane.org Message-ID: <52187852-ff8e-4e59-a8cf-7a29fd0a405b@isocpp.org> References: <4DA018C3-2327-4F55-B7F8-7988EC7B789A@gmail.com> <1a858a77-310b-4591-aaf5-960c40d9f5fc@isocpp.org> <66AF41C1-CB37-4311-98EA-D47DBC6068DC@gmail.com> <66c38b61-7a95-4ace-b34f-2346bb334fb9@isocpp.org> <6F4B3C72-9962-48DC-8527-0C89EA1B9710@gmail.com> <35873CE5-ED8C-4C03-A6A1-E4132DECD91F@gmail.com> <335948E6-8140-4673-B958-930356A52070@gmail.com> <76ACA175-5A44-4BE8-B49F-BAC6DA65E6B1@gmail.com> <4D3852AD-1AEB-44BA-941C-D645BAD19405@gmail.com> <6a4b6425-1167-40c1-acd8-3945c8cd4c74@isocpp.org> <13DD0D7A-A146-4667-9F30-6FB3739CDBE0@gmail.com> <6B925FF7-2940-44C7-BF1D-13209A703BA2@gmail.com> <944C9C01-865B-4215-8C91-95F01AEA256E@gmail.com> <8DC3E474-3957-40B2-B492-D4AF2FDDD451@gmail.com> <0ACAE525-4FB2-4932-BBD2-F0623C4EBBFB@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_176_5463280.1405076240252" X-Trace: ger.gmane.org 1405076251 2084 80.91.229.3 (11 Jul 2014 10:57:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 11 Jul 2014 10:57:31 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDNPVXXG6IGBBEMG76OQKGQEQO2KMJA@isocpp.org Fri Jul 11 12:57:24 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ie0-f197.google.com ([209.85.223.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5YW3-0001RJ-4W for gclcip-std-proposals@m.gmane.org; Fri, 11 Jul 2014 12:57:23 +0200 Original-Received: by mail-ie0-f197.google.com with SMTP id rd18sf4653967iec.8 for ; Fri, 11 Jul 2014 03:57:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=B5jNOThP9vdv4AgLNZTAwM1iwgbf6gMOu6gZb2rvzs4=; b=DNKxxyjv6ACrdEjOI7TJ9OO6k2Q2yQWGxTNwI/8ohoq7EDV7+4AYUHBjZ1FBmHux4J KaCC5SI4ZoqbDC+t2Kln9pBYqEnjvS4WOka7Kscdt8xtfAMjSZKaaV34THCkySKR0K9l 93zCghisc337eFSZgpBa/LfOd5Yt6KSnPPcBPfzkCF1GfAv38mC5f2TUsCCxUFKoRPns 3eU9k/Q8X1PCWm7qe3MVzX4XI+5wydD0emxzTVR4of5R0vlBjqSj6IaKoTVx6R5kr/I9 PabL5Y6Q55xl0Bh1DWE6wRfhHr5/HHyPsJNadTeAR1IrB5PMi2I3K9+iChK18j+CfBLF rcuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=B5jNOThP9vdv4AgLNZTAwM1iwgbf6gMOu6gZb2rvzs4=; b=gM/i7Au5wyxJ63jjTQCrxc9hwi/b238ZYt1qdkJFr04SP2SJ5QSHM1RLF2DLdIfsYW IEHriu5wdcVUlTLUxNBGss7N/D1QVUK4N6vZtv1oQ4C45u8Qs4aPStjW7iV1XA1tsJbU U22+mGEYp3eyGIKTwrrgYkkTgnw2SmKJo0TjVMiqjd7n37w+sFrLaJOkKWTGjjzOBMKr S2/Si2G+flxesvtsMw3ebvwtwSb452d7P4ZNDU0FhKGppEA/YJrBO07dUPZTXMeH5qCa kslMwW6Qz/yXSLgX+g0W1dBsNszXdmbZb1vQ1A4SCSa+I6vZNaOIxdpBx0/77uSVtnxc WUlA== X-Gm-Message-State: ALoCoQlYzgHaOyMz4G08LdEgn6pd26IJlf5W9YXHi65U6CS1jZlRnp1IHIX0hEhUwlsfEHIZ2fO5 X-Received: by 10.42.123.148 with SMTP id s20mr1585949icr.8.1405076242209; Fri, 11 Jul 2014 03:57:22 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.76.6 with SMTP id g6ls376723obw.50.gmail; Fri, 11 Jul 2014 03:57:21 -0700 (PDT) X-Received: by 10.182.109.234 with SMTP id hv10mr309936obb.2.1405076241262; Fri, 11 Jul 2014 03:57:21 -0700 (PDT) In-Reply-To: <0ACAE525-4FB2-4932-BBD2-F0623C4EBBFB@gmail.com> X-Original-Sender: tomaszkam@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:11869 Archived-At: ------=_Part_176_5463280.1405076240252 Content-Type: text/plain; charset=UTF-8 Do we found any other argumentation for T member()&& overload except making auto&& s = f; work for some cases? In the follwoing example: template delctype(auto) f(T&& t) { return std::addressof(*std::forward(t)); } template delctype(auto) g(T&& t) { auto&& ret = f(std::forward(t)); //will create a dangling pointer, because the liftetime of result of f.value() is not longer same a liftme of the owner t } The making auto&& works actually breaks the auto&&. Do we really wont to make "auto&&" to work at some cases in the cost of breaking other cases? -- --- 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 http://groups.google.com/a/isocpp.org/group/std-proposals/. ------=_Part_176_5463280.1405076240252 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Do we found any other argumentation for T member()&&am= p; overload except making auto&& s =3D f; work for some cases?
=
In the follwoing example:
  template<typename T>
 = ; delctype(auto) f(T&& t) { return std::addressof(*std::forward<= T>(t)); }
  
  template<typename T>
 = ; delctype(auto) g(T&& t) {
      auto= && ret =3D f(std::forward<T>(t));
    = ;  //will create a dangling pointer, because the liftetime of result o= f f.value() is not longer same a liftme of the owner t
   }The making auto&& works actually breaks the auto&&. Do we = really wont to make "auto&&" to work at some cases
in the cost o= f breaking other cases?

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