220 11816 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: Thu, 10 Jul 2014 13:34:37 -0700 (PDT) Lines: 63 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="----=_Part_44_4648412.1405024477316" X-Trace: ger.gmane.org 1405024489 19798 80.91.229.3 (10 Jul 2014 20:34:49 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 10 Jul 2014 20:34:49 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDNPVXXG6IGBBXXR7OOQKGQEEHSQIDA@isocpp.org Thu Jul 10 22:34:42 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qa0-f71.google.com ([209.85.216.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5L3A-0002Xw-42 for gclcip-std-proposals@m.gmane.org; Thu, 10 Jul 2014 22:34:40 +0200 Original-Received: by mail-qa0-f71.google.com with SMTP id m5sf433530qaj.2 for ; Thu, 10 Jul 2014 13:34:39 -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=SqQcHGQp/v+jI3s3N4PuZE1zhzFkzMaPNAB97hvrpyc=; b=z130LlUXCjMJ7MmEpouYvg+xilwOm3OE0kB55iUMUci7BjqkL7BHdbq1BGOT05LTnL QMdV5pXlKFgSBoy5bLFCiCnGJNkZ1Xhen0KVnV4HUAhpHxJoSDLqODGjossqc4GkIHUk ugHT0/XfcuF6D0c8+ba8cVMhaM5Vg92fo4nqvFU6B9Il1UrZs9Wu6OeQf30afUe03bpS Y9uTMyBiegsT7uvSPmEXY2WbfUw3V8fGXmqcBgqHGOkfBprMpTL/DWfLDJ0dHzJOst00 VUzVpu12f8pZwMR5hVer37/SBnZqa6PKcHOBvW+gQxQl7NGra+g3UQXv1bcv/sil5rAe TOhQ== 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=SqQcHGQp/v+jI3s3N4PuZE1zhzFkzMaPNAB97hvrpyc=; b=HphvtihlObts50HQJGUibtco48L5y2sbxEE5ohSodUP4/D/htEX1fVXyn3QSQBfJFW 6yMc+WRhyF0XEtdXH5aJ5jq2qJVtX3I5kpa8aVE2DUSm2dDQHxpDJ3LMus8dZdheldex yLVBRhghgZz3vMRhMz1fK/13Jz1SMvHqrZg466Uy2lKQVqst6tl2ME0aujAekeKrx8sT ecFoUSBgxZU+cZoXuwnoDcs1G8inXWzQHmi1Ernd9B+21zdvnGkJVz/PCb0aR2cWKFpp bfsikxwTQ7e7VLO3nOx85VcpV7ocThntDSvdTJhw6l1herkYgaeRgB7xx7W4st9szVx2 jzuA== X-Gm-Message-State: ALoCoQmivMWF0w17n7PekwpbNn+YE5TQsvYwIzKrAjsrUxi9yIUAFusZzWQSbRIqQI+lAWdo9GnM X-Received: by 10.236.231.238 with SMTP id l104mr22029697yhq.51.1405024479326; Thu, 10 Jul 2014 13:34:39 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.247.6 with SMTP id ya6ls192298obc.27.gmail; Thu, 10 Jul 2014 13:34:38 -0700 (PDT) X-Received: by 10.182.51.198 with SMTP id m6mr286628obo.8.1405024478235; Thu, 10 Jul 2014 13:34:38 -0700 (PDT) In-Reply-To: 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:11816 Archived-At: ------=_Part_44_4648412.1405024477316 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable W dniu czwartek, 10 lipca 2014 22:29:43 UTC+2 u=C5=BCytkownik Tony V E napi= sa=C5=82: > > > I may have missed it within the discussion, but has anyone suggested=20 > 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? --=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/. ------=_Part_44_4648412.1405024477316 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
W dniu czwartek, 10 lipca 2014 22:29:43 UTC+2 u=C5=BCytkow= nik 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 =3Ddelete= d?

Tony


You would like the followi= ng code:
  std::optional<T> f();
  std::cout <<= f.value() << std::end;
To be ill-formed because of use of deleted= method. May I ask why?

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