220 15387 <2661329.DH01uZEFxC@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: get count of std::weak_ptr objects tracking a shared resource Date: Tue, 30 Dec 2014 10:47:05 -0200 Lines: 22 Approved: news@gmane.org Message-ID: <2661329.DH01uZEFxC@tjmaciei-mobl4> References: <14793018.ckK0tnNYDa@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1419943641 30364 80.91.229.3 (30 Dec 2014 12:47:21 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 30 Dec 2014 12:47:21 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBUV5RKSQKGQEYF2J35I@isocpp.org Tue Dec 30 13:47:16 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f198.google.com ([74.125.82.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Y5wCh-00064y-Uu for gclcip-std-proposals@m.gmane.org; Tue, 30 Dec 2014 13:47:16 +0100 Original-Received: by mail-we0-f198.google.com with SMTP id q59sf546798wes.9 for ; Tue, 30 Dec 2014 04:47:15 -0800 (PST) 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-type:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=usxFeHstSeq8NUhWlF5cy2NDgWPA60JRHzBKZyA8sEM=; b=LltC5YYZTO2oVM9qxJpbu7cNvX5pdMpNLGSnyxv41cjabBsU7CQk98ymQw/s4rLK9N 6bDRvnQ4ohi2RM5zlIpfFzQ8YuTMgWwc+DIn1s+fPLbrQzeCT/bd4VBhmiP1FbU86fCo FtZQYb6+4rsoyyBHpJu2NJRmsVQHvl+cKTpif5+/KzbXvTXJAIok9tHaczUBs6evtb+s ukiAZUS1kSshLkDPM2K+fxAWbFkFKf+oqtHEU1XhsKsZALyNo/PJcI7mY/7A52PPCJcy haCg8co+FleirSGBd8g6O1dm6JQj5C3yRnvl2FLW4Kikxck76fWQXMg8L/U97Udi0z4U 92Ng== X-Gm-Message-State: ALoCoQndPNj7gR2GTq2sqrrx8EIcqhANYIM1f03uwau5R1tDuKesSxIizRi8d/Est2PhIVEW9xih X-Received: by 10.112.9.199 with SMTP id c7mr248879lbb.7.1419943635332; Tue, 30 Dec 2014 04:47:15 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.108.80 with SMTP id hi16ls1501677wib.15.canary; Tue, 30 Dec 2014 04:47:12 -0800 (PST) X-Received: by 10.180.12.75 with SMTP id w11mr107671660wib.9.1419943632735; Tue, 30 Dec 2014 04:47:12 -0800 (PST) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id dj9si60665078wjb.102.2014.12.30.04.47.12 for ; Tue, 30 Dec 2014 04:47:12 -0800 (PST) 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 [189.0.120.56]) by gondolin.macieira.info (Postfix) with ESMTPSA id DDC6011BAEF for ; Tue, 30 Dec 2014 04:47:11 -0800 (PST) User-Agent: KMail/4.14.3 (Linux/3.11.10-21-desktop; KDE/4.14.3; 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.mail=thiago@macieira.org 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:15387 Archived-At: On Tuesday 30 December 2014 09:35:48 Douglas Boffey wrote: > And I suppose wrapping it in a mutex is no go? That would imply that all the operations that change those values need to be wrapped in a mutex. So you're introducing a performance bottleneck for every operation just for the ability to get the count. Is it worth it? -- 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 -- --- 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/. .