220 18860 <9D53ABD7-2AE4-4109-ACE0-C939DE311ACA@mac.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Compressing std::optional Date: Mon, 29 Jun 2015 00:22:33 +0800 Lines: 65 Approved: news@gmane.org Message-ID: <9D53ABD7-2AE4-4109-ACE0-C939DE311ACA@mac.com> References: <4359ebfb-5e20-42c1-84a0-16ef6201db33@isocpp.org> <33303ec4-d4c3-4080-a7bb-346496e38114@isocpp.org> <749546C6-8165-4775-A3E2-319F6EA84EE5@gmail.com> <8fc1d9f9-41a8-431c-a89d-448bea95a5db@isocpp.org> <07A8C4E9-69D7-4EE2-AADB-7179FB93BEA1@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_77B7ABA9-3924-4B46-B3C4-4D48D3BCAD48" X-Trace: ger.gmane.org 1435508568 4979 80.91.229.3 (28 Jun 2015 16:22:48 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 28 Jun 2015 16:22:48 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBAABBT56YCWAKGQERS5ZTGQ@isocpp.org Sun Jun 28 18:22:41 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f199.google.com ([209.85.192.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Z9FLt-0001DP-6G for gclcip-std-proposals@m.gmane.org; Sun, 28 Jun 2015 18:22:41 +0200 Original-Received: by pdir4 with SMTP id r4sf283255801pdi.2 for ; Sun, 28 Jun 2015 09:22:40 -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:content-type:message-id:mime-version :subject:date:references:to:in-reply-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=Tt+V7zME7NU7LT4PeGC7p9pLnBTzZDySKLq/iNyUQoI=; b=L/T0BOhdlB9U0SvYB7ZsBTMgmFyIXtXBC1Ky2vRNEkwCqEfJauwhe9UNPcy36Pt/O2 IUOqNAQSXqaUj7K8PffUUAHSf2qUJSxigQOTEHB/rUAwNepfcarhO2NyZ8aPY2ySuTY9 zdUthCq/9y/Al3tm4lJgM21kBVl9IwLrD6+pPeZnypH/od4OXIQs9eaYJ8U8qwiJ+SSQ P0SgZJ+GkXClAUCgiTzF4C8JKjkoAVU0Ny60zeCzBCpOgpcfJRn/hwNTyeEtuEF8CDPz 774ltd9YOJ6Dv09OjVaWx+eonJUUOH1AMrVwhUJd/7kFxDQGjsRKOPYkos5EzxLzlkI5 Or8Q== X-Gm-Message-State: ALoCoQnH0pmBM5P+v9mO0u4b/IqtP1sGwGa8ENKvFSG33XzPjIrfvUoKaIDtSLsicLafJOmIib56 X-Received: by 10.68.195.166 with SMTP id if6mr14321203pbc.6.1435508560029; Sun, 28 Jun 2015 09:22:40 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.142.2 with SMTP id rs2ls673707igb.26.canary; Sun, 28 Jun 2015 09:22:39 -0700 (PDT) X-Received: by 10.66.55.105 with SMTP id r9mr23514881pap.143.1435508559300; Sun, 28 Jun 2015 09:22:39 -0700 (PDT) Original-Received: from nk11p04mm-asmtp001.mac.com (nk11p04mm-asmtpout001.mac.com. [17.158.236.236]) by mx.google.com with ESMTPS id g14si8173141pdf.174.2015.06.28.09.22.39 for (version=TLSv1.2 cipher=AES128-GCM-SHA256 bits=128/128); Sun, 28 Jun 2015 09:22:39 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@mac.com designates 17.158.236.236 as permitted sender) client-ip=17.158.236.236; Original-Received: from [172.20.10.2] (unknown [121.54.44.88]) by nk11p04mm-asmtp001.mac.com (Oracle Communications Messaging Server 7.0.5.35.0 64bit (built Mar 31 2015)) with ESMTPSA id <0NQN009ACXHMSK30@nk11p04mm-asmtp001.mac.com> for std-proposals@isocpp.org; Sun, 28 Jun 2015 16:22:38 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.14.151,1.0.33,0.0.0000 definitions=2015-06-28_03:2015-06-26,2015-06-28,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=1 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1412110000 definitions=main-1506280295 In-reply-to: <07A8C4E9-69D7-4EE2-AADB-7179FB93BEA1@gmail.com> X-Mailer: Apple Mail (2.2098) X-Original-Sender: potswa@mac.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@mac.com designates 17.158.236.236 as permitted sender) smtp.mail=potswa@mac.com; dmarc=pass (p=NONE dis=NONE) header.from=mac.com 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:18860 Archived-At: --Apple-Mail=_77B7ABA9-3924-4B46-B3C4-4D48D3BCAD48 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 > On 2015=E2=80=9306=E2=80=9329, at 12:19 AM, Vitali Lovich wrote: >=20 > Hmmm... And how would optional decide what state it needs to store? Initialize the disengaged state with invalidate_representation. Construct t= he object to engage. Query engagement with is_valid_representation. --=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/. --Apple-Mail=_77B7ABA9-3924-4B46-B3C4-4D48D3BCAD48 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8
On 2015=E2=80=9306= =E2=80=9329, at 12:19 AM, Vitali Lovich <vlovich@gmail.com> wrote:

Hmmm... And how would optional decide= what state it needs to store?

Initialize the di= sengaged state with invalidate_representa= tion. Construct the object to engage. Query engagement with is_valid_representation.

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