220 25981 <3687646a-55a2-46b3-a056-d2cdcb65c797@isocpp.org> article Path: news.gmane.org!not-for-mail From: Jakob Riedle Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Notification function for shared_from_this for when attachment happened? Date: Sat, 21 May 2016 09:34:15 -0700 (PDT) Lines: 67 Approved: news@gmane.org Message-ID: <3687646a-55a2-46b3-a056-d2cdcb65c797@isocpp.org> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_349_980217733.1463848455285" X-Trace: ger.gmane.org 1463848458 975 80.91.229.3 (21 May 2016 16:34:18 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 21 May 2016 16:34:18 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCX2XNFO6MPRBCE4QK5AKGQECTEGXGI@isocpp.org Sat May 21 18:34:18 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f200.google.com ([209.85.220.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1b49r0-0005Rs-1I for gclcip-std-proposals@m.gmane.org; Sat, 21 May 2016 18:34:18 +0200 Original-Received: by mail-qk0-f200.google.com with SMTP id v128sf310674909qkh.1 for ; Sat, 21 May 2016 09:34:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=ImY+4tndI7d59MfD+wyKr4WPki/GyI1CfxIc/7ucKYY=; b=Dn+5pcv01oA/71udz1kCIrCjCy/Fg/vMRaJqQc6NAAwfgcbnqi/WcBPR7NZAIVkRKJ 1qWj8TdgDYJpe98cXR42rMnBxCOzUri+PnhgwXwPRAW7r8aKk5jdHKIpYjXUns55TadN OIfWyHGJygQiL5vhRZhMSMLVj5w5GOrOxVs/J2BKz8PX0ObxpoUNnL3LQ1GWCUvzpPDm QM/9gJ0idGTpoQjQ7A2pG1t+s9VkUq3ofHT4DeEgbF/Ogcdk9xs1SAiYwmSeBXSnK4nM kL/ccmnhapQalEfBoGZ5n+bBj5nUMZC0NBSQGTe2s18c+I5NJOHySmCgLZd8+2X2Zd3j cYaw== 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 :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=ImY+4tndI7d59MfD+wyKr4WPki/GyI1CfxIc/7ucKYY=; b=QQ3S7gIdJEy2ORUEKrB9CyN4btATTPGf7G4DLemAKs5SbuAeGgzE7E+G4y35Aynmlk UryrXTprvIL3ZEtAqR/3TdhikS5uT8pAPyQLM6B36K8yheOS75zCnX9RDMzZH4oGpRkp Y1zUXhI57ef9rE5ugXfc6dRsBUJ7HEYY9zO2whTZRvBHlH3ZpLDX188RCo9UtgXROsl5 4Bp2m9B4INsZtchsHaVssUE4adVbPRqvxK/8drYjDThuKcpkqCNNdymug7qPFNbmfU8f K+KVwT5/RLgOYSsjN3oY2xuHS/ylEDec6/w7kHsLiH/r49TuVarBothS+NbIjm5eGMbz bONw== 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:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=ImY+4tndI7d59MfD+wyKr4WPki/GyI1CfxIc/7ucKYY=; b=BFvDr7fXZJ7HapeRh3G6Zh8PHqbGljxq+ZXN/jcwwe6lgkAt+PtcW5Oq6qNWLzrhEE 0YRpIvhd3eBBq2rLFC/cp+t2V2pV2L21wSnhA2eU3ujc1U7Ygu4YWqEEJH24JE7qsqeU dI2jqbAC+BjXPbLIYw6+d/BkoaHkFuk36WsrivEYdxp74oOM3jjaxqaSTerK8UoetdA2 1QqVBV0IGb1kYjmzFePGfzTIHrgZhraDBCPyD/s5mzXyhuSEiLhikPCUuvPwWOsMAOI0 ESMo9xBay4iy7lDyWfSDanRHscy+F/LYUZOpiGSx1k6UlUwHZfg4wgtDv7ogGIs5W283 zM6A== X-Gm-Message-State: AOPr4FX6TBfE+na2wVsQtg17iWZJeK8wOZTGLH1ZwbSDawGJXsDPFUazyvR05KBuptHlrA== X-Received: by 10.129.155.136 with SMTP id s130mr5870429ywg.24.1463848456978; Sat, 21 May 2016 09:34:16 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.36.50.202 with SMTP id j193ls453480ita.16.canary; Sat, 21 May 2016 09:34:15 -0700 (PDT) X-Received: by 10.36.84.85 with SMTP id t82mr131027ita.7.1463848455900; Sat, 21 May 2016 09:34:15 -0700 (PDT) In-Reply-To: X-Original-Sender: jakob.riedle@gmail.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:25981 Archived-At: ------=_Part_349_980217733.1463848455285 Content-Type: multipart/alternative; boundary="----=_Part_350_1257815123.1463848455292" ------=_Part_350_1257815123.1463848455292 Content-Type: text/plain; charset=UTF-8 Since not being able to construct a shared_ptr pointing to *this in a constructor is a major downside in my opinion, I've written a *drop-in replacement* for shared_ptr and enable_shared_from_this: https://sourceforge.net/projects/shared-from-this-ctor/ The only drawback is that it's not thread safe. For all single threaded purposes, it works really well. I would really like to see this functionality in some future version of C++, since this proof of concept does not require any more memory, nor is it significantly slower. By the way: The only reason for it not being thread-safe is, that I don't want to add any asm crack-pottery to my code. Hope, I could help! Cheers, Jakob -- 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. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/3687646a-55a2-46b3-a056-d2cdcb65c797%40isocpp.org. ------=_Part_350_1257815123.1463848455292 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Since not being able to construct a shared_ptr pointi= ng to *this in a constructor=C2=A0is a major downside in my opinion, I'= ve written a drop-in replacement for shared_ptr and enable_shared_fr= om_this:

https://sourceforge.net/projects/shared-f= rom-this-ctor/

The only drawback is that it's = not thread safe. For all single threaded purposes, it works really well. I = would really like to see this functionality in some future version of C++, = since this proof of concept does not require any more memory, nor is it sig= nificantly slower. By the way: The only reason for it not being thread-safe= is, that I don't want to add any asm crack-pottery to my code.

Hope, I could help!

Cheers, Jako= b

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