220 11817 article Path: news.gmane.org!not-for-mail From: Tony V E Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: N4078: Rvalue reference overloads for value() method returns object by value Date: Thu, 10 Jul 2014 16:38:25 -0400 Lines: 85 Approved: news@gmane.org Message-ID: 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> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c3c3f879741904fddccee1 X-Trace: ger.gmane.org 1405024717 22587 80.91.229.3 (10 Jul 2014 20:38:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 10 Jul 2014 20:38:37 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCUZ5QWKNQIMF473TUCRUBHYG5QEG@isocpp.org Thu Jul 10 22:38:30 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f197.google.com ([74.125.82.197]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5L6q-0006Rv-A0 for gclcip-std-proposals@m.gmane.org; Thu, 10 Jul 2014 22:38:28 +0200 Original-Received: by mail-we0-f197.google.com with SMTP id q59sf74169wes.0 for ; Thu, 10 Jul 2014 13:38:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=Hh2j6AVo/cFPk06JJqsqfOUKUbur57YL1yFcXGbmoMs=; b=cn/7Yb73ZLPwbaSZFIk0sWYvVtIWNWEmJfXVKN7K7epJjhDou3gJ7DR4EgrIRD2QVK xW6H/83AR2fFOxqwJcpupNXaQydUwbVZRpj3+gUbIftqLtvH1s1MTnCSy7mBQ6lJdRQi B8qbEzskb2GgwzBOC/QsGatxHCLPIC8skeieZe7qXBJcz7OYIKR+VD7RLcCErcLzQrAv 1CiIBLoGFKbPPZ4zJrUUUaDI+c4CX07WuMwAkdPeGv6lxF0j+AyYYSvRMC2cbsiO9+ZN ZD5w70K3fq8JiE8vo+rR3abhqILVbOeDhHUgVftiyvYIknMUp7Rnf8fEm52XhEg2wxwU ZNpQ== X-Gm-Message-State: ALoCoQmJOZBO/LQiVgM18qt/z8shNvQdQ0ZnA7hxCVjQ7PG7p6qlLlg6vhBo/fGbD9EipblqKtMN X-Received: by 10.112.188.229 with SMTP id gd5mr681806lbc.13.1405024707997; Thu, 10 Jul 2014 13:38:27 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.20.3 with SMTP id j3ls56580lae.99.gmail; Thu, 10 Jul 2014 13:38:25 -0700 (PDT) X-Received: by 10.112.163.65 with SMTP id yg1mr103887lbb.44.1405024705675; Thu, 10 Jul 2014 13:38:25 -0700 (PDT) Original-Received: from mail-la0-x230.google.com (mail-la0-x230.google.com [2a00:1450:4010:c03::230]) by mx.google.com with ESMTPS id kx3si257190lac.11.2014.07.10.13.38.25 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 10 Jul 2014 13:38:25 -0700 (PDT) Received-SPF: pass (google.com: domain of tvaneerd@gmail.com designates 2a00:1450:4010:c03::230 as permitted sender) client-ip=2a00:1450:4010:c03::230; Original-Received: by mail-la0-f48.google.com with SMTP id el20so116328lab.7 for ; Thu, 10 Jul 2014 13:38:25 -0700 (PDT) X-Received: by 10.112.211.201 with SMTP id ne9mr26050515lbc.9.1405024705537; Thu, 10 Jul 2014 13:38:25 -0700 (PDT) Original-Received: by 10.112.163.169 with HTTP; Thu, 10 Jul 2014 13:38:25 -0700 (PDT) In-Reply-To: X-Original-Sender: tvaneerd@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of tvaneerd@gmail.com designates 2a00:1450:4010:c03::230 as permitted sender) smtp.mail=tvaneerd@gmail.com; dkim=pass header.i=@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: 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:11817 Archived-At: --001a11c3c3f879741904fddccee1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Thu, Jul 10, 2014 at 4:34 PM, wrote: > W dniu czwartek, 10 lipca 2014 22:29:43 UTC+2 u=C5=BCytkownik Tony V E na= pisa=C5=82: > >> >> I may have missed it within the discussion, but has anyone suggested >> making this version of the value() function =3Ddeleted? >> >> Tony >> >> > You would like the following code: > std::optional f(); > std::cout << f.value() << std::end; > To be ill-formed because of use of deleted method. May I ask why? > > > Because there seemed to be discrepancies as to how it should work... .... and because I didn't think it through very far :-) --=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/. --001a11c3c3f879741904fddccee1 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable



On Thu, Jul 10, 2014 at 4:34 PM, <tomaszkam@gmail.com> wrote:
W dniu czwartek, 10 lipca 2= 014 22:29:43 UTC+2 u=C5=BCytkownik Tony V E napisa=C5=82:

I may have missed it within the discussion,= but has anyone suggested making this version of the value() function =3Dde= leted?

Tony


You would like the f= ollowing code:
=C2=A0 std::optional<T> f();
=C2=A0 std::cout &l= t;< f.value() << std::end;
To be ill-formed because of use of d= eleted method. May I ask why?



Because there seeme= d to be discrepancies as to how it should work...


...= and because I didn't think it through very far :-)

=C2=A0

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