220 26932 article Path: news.gmane.org!not-for-mail From: "D. B." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal - non allocating std::function Date: Thu, 14 Jul 2016 00:26:31 +0100 Lines: 61 Approved: news@gmane.org Message-ID: References: <4948193.1toAHviMXG@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a1130cf323729f205378cb790 X-Trace: ger.gmane.org 1468452397 5251 80.91.229.3 (13 Jul 2016 23:26:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 13 Jul 2016 23:26:37 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCWNZ4ECS4GBBKE4TO6AKGQEQOJH3VQ@isocpp.org Thu Jul 14 01:26:37 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f69.google.com ([74.125.82.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bNTY1-0002xP-S6 for gclcip-std-proposals@m.gmane.org; Thu, 14 Jul 2016 01:26:33 +0200 Original-Received: by mail-wm0-f69.google.com with SMTP id r190sf44538337wmr.0 for ; Wed, 13 Jul 2016 16:26:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject: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=U+tDwoXBkkNLRq9kBIa0M9trYKWz2ykUTKepJTEep6c=; b=qhbVhdM+CjVWabssW7ks8z1Ehmz/BB+WR5gRCFvlURLh0P3Ges4lnq2yz4W69ABRXM nASONrPVbQjEYwg5UrrSBRYLQSJCfguZlao2mdTfd8wIJyvkfE0XsQJ1o+qpbFgERVgY bqU3WaQhJyi32BPb66oDAz2AV/H2pR+LQ0Ixfoiy64j8ttrUZjaUJs7WbRd0WJF0dKkZ zEdmnOUtM8toqunnEpFUxvlbt7tVDojbyNSdNxy6qPLgnLN3tQLQVO0xqHKSxmv7ykoH vEpxRBlEnJhaitAQSOcDHRLWI7TUC0+oTFAQZ2vJPZQNNvMSyEbUbTpDe+tyGwumTPpD ZXsg== 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:from:date :message-id:subject: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=U+tDwoXBkkNLRq9kBIa0M9trYKWz2ykUTKepJTEep6c=; b=QRmyFAevZoUhxyIHGlspDyv/Sda0pNZFlNu85TQJR/X+UuM/xA0cSb3va72rj95HGc eNQEP8a+K/nL+91B7lj2wxmXZeqO7etjGgABV1aSHLrQzsRxfofpEe/JeCTOYH1WA0Nb 3yI9Qtr68OuKxHSr59LyIWyaU6cheVSRwGfCOJokmOJn40d5nPNCY2Jj8Qk5nb9XNwOp QtEDJ6dbvjTNdpKTto/0ci1y7q5IxqKsdUlCbdTsBe5guoy9MfYmD7xFI3JyS/mXV6TT IrMhVGcB3PKdkpxtqn6+k4Fnr9mC2P1TPce0hqHsL4AdIt1Iyv3tSO3e6gfTasH2LBzf IjUg== X-Gm-Message-State: ALyK8tIvMjjtFRqMdtczz8j01G1AyEyzR7u2U2A6cBWKph3LL5Z8MwRvPHQeLx4/yfLBXA== X-Received: by 10.194.112.103 with SMTP id ip7mr544492wjb.4.1468452393398; Wed, 13 Jul 2016 16:26:33 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.52.21 with SMTP id b21ls37259wma.1.canary; Wed, 13 Jul 2016 16:26:32 -0700 (PDT) X-Received: by 10.194.115.164 with SMTP id jp4mr3330317wjb.94.1468452392688; Wed, 13 Jul 2016 16:26:32 -0700 (PDT) Original-Received: from mail-wm0-x22b.google.com (mail-wm0-x22b.google.com. [2a00:1450:400c:c09::22b]) by mx.google.com with ESMTPS id ec19si3381592wjb.0.2016.07.13.16.26.32 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 13 Jul 2016 16:26:32 -0700 (PDT) Received-SPF: pass (google.com: domain of db0451@gmail.com designates 2a00:1450:400c:c09::22b as permitted sender) client-ip=2a00:1450:400c:c09::22b; Original-Received: by mail-wm0-x22b.google.com with SMTP id o80so90685340wme.1 for ; Wed, 13 Jul 2016 16:26:32 -0700 (PDT) X-Received: by 10.194.112.163 with SMTP id ir3mr2939456wjb.78.1468452392346; Wed, 13 Jul 2016 16:26:32 -0700 (PDT) Original-Received: by 10.28.90.68 with HTTP; Wed, 13 Jul 2016 16:26:31 -0700 (PDT) In-Reply-To: <4948193.1toAHviMXG@tjmaciei-mobl1> X-Original-Sender: db0451@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of db0451@gmail.com designates 2a00:1450:400c:c09::22b as permitted sender) smtp.mailfrom=db0451@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-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:26932 Archived-At: --001a1130cf323729f205378cb790 Content-Type: text/plain; charset=UTF-8 On Thu, Jul 14, 2016 at 12:22 AM, Thiago Macieira wrote: > Hi Carl > > Can you explain somewhere why std::function is unable to do that? > > In other words, why must std::function allocate memory? > I think the issue is not that it "must allocate", rather that it's not required to embed and provides no way for the user to ensure embedding, and typical implementations don't provide enough in-object space for Carl and co's cases. -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. 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On T= hu, Jul 14, 2016 at 12:22 AM, Thiago Macieira <thiago@macieira.org&g= t; wrote:
Hi Carl

Can you explain somewhere why std::function is unable to do that?

In other words, why must std::function allocate memory?

I think the issue is not that it "must allocate"= , rather that it's not required to embed and provides no way for the us= er to ensure embedding, and typical implementations don't provide enoug= h in-object space for Carl and co's cases.

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