220 26929 <4948193.1toAHviMXG@tjmaciei-mobl1> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Proposal - non allocating std::function Date: Wed, 13 Jul 2016 16:22:41 -0700 Lines: 47 Approved: news@gmane.org Message-ID: <4948193.1toAHviMXG@tjmaciei-mobl1> References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1468452175 1981 80.91.229.3 (13 Jul 2016 23:22:55 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 13 Jul 2016 23:22:55 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBQ42TO6AKGQEQLSSCCY@isocpp.org Thu Jul 14 01:22:45 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f72.google.com ([74.125.82.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bNTUK-0000Ai-UV for gclcip-std-proposals@m.gmane.org; Thu, 14 Jul 2016 01:22:45 +0200 Original-Received: by mail-wm0-f72.google.com with SMTP id o80sf44534963wme.1 for ; Wed, 13 Jul 2016 16:22:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:user-agent:in-reply-to:references :mime-version:content-transfer-encoding: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=Gt0qZ1N5SSXaYbMAQPitpSzBFvsrUQJ7qvjOqSlEw6k=; b=C15pEaIVhu/MKFpzLfGmMQWSR5M9S3L4Vq9CZOCjrC0+cCA4MHfIIf3R/HibyHz60I ur7moVQa7s73lulQ6QIBDFxNXiq65ZAfOoGie0ZevXtVuOlCO/NrFMvkzUdyTbaBRpJr lUDYXAHfciiNSW/2tywCgHwwmppyB32h8CCa0aPRuKrFp2+DEIIaHL46tu2a5pXBTvWz FVwMVTj7dkNTorZ7cCYeyYAE6ueycuSEwZxuxToveD2M2rk6K3iPme84FMuXm5rAtBm5 8+w+oLU/SpKvaGqj8tNp2gzHlk+aTWYmovgoXDAvKkk/IIXJdRTz6nbbizDFtDUDs6oM 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-transfer-encoding :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=Gt0qZ1N5SSXaYbMAQPitpSzBFvsrUQJ7qvjOqSlEw6k=; b=HXp9+UY986U8kqLMYVEwfzp7N9T29WUN7Dent011X5YRoUsFP+6wqpFjqOX3aIk9HF Gq93p0iP532F1K8cciBYLp/oixHc5cOELrjknshBQ1uaG9GlajI2tewJARXanQxWVAsl g7lhdit0JMSl3T0bvMyXntwD74l5dy/tHo2b3s+mwmx/mBGbSXUjdBY7gdWV77dG9/kb y1pHgKipKqACCHjOqcB7DsId89OdW71eIouSjc1mFULKdCRQl8WsG2epbdFes69wzPm0 Rm/TQ+MvWZLYXDFWKkQPBScL/toCLM4ZLaaRXfCmuxMf6aDvZhmOiNAWPN7XepUXJy9v X-Gm-Message-State: ALyK8tKlZQdaEMYa5xkjf8fxEuZxC9qVJaHWF4sI4Rb5/eZ2TA4tSWIrh/yjbSgAgjSFFg== X-Received: by 10.46.32.69 with SMTP id g66mr1888507ljg.8.1468452164415; Wed, 13 Jul 2016 16:22:44 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.210.208 with SMTP id j199ls65200wmg.14.gmail; Wed, 13 Jul 2016 16:22:43 -0700 (PDT) X-Received: by 10.28.54.229 with SMTP id y98mr26672108wmh.96.1468452163477; Wed, 13 Jul 2016 16:22:43 -0700 (PDT) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [78.47.120.188]) by mx.google.com with ESMTP id ep12si3361947wjd.71.2016.07.13.16.22.43 for ; Wed, 13 Jul 2016 16:22:43 -0700 (PDT) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 78.47.120.188 as permitted sender) client-ip=78.47.120.188; Original-Received: from tjmaciei-mobl1.localnet (unknown [134.134.139.77]) by gondolin.macieira.info (Postfix) with ESMTPSA id 2306111A67C for ; Wed, 13 Jul 2016 16:22:43 -0700 (PDT) User-Agent: KMail/5.2.2 (Linux/4.6.3-1-default; KDE/5.23.0; 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 78.47.120.188 as permitted sender) smtp.mailfrom=thiago@macieira.org 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:26929 Archived-At: Em quarta-feira, 13 de julho de 2016, =C3=A0s 15:47:44 PDT, Carl Cook escre= veu: > Hi all, >=20 > This is a cross posting from the SG14 reflector, regarding a draft propos= al > some of us are working on. >=20 > Very briefly, some of us are interested in having a standardized function > which does not incur an upfront memory allocation to store the callable > target, instead opting for a compile time specified buffer (stack > allocated). This has been quite useful in several low latency domains suc= h > as gaming and electronic trading. In other words, a drop-in replacement f= or > std::function, where all data is on the stack. >=20 > The original post is > here: > https://groups.google.com/a/isocpp.org/d/topic/sg14/1Sw_qEdIYes/discussio= n >=20 > The resultant draft proposal is > here: > https://github.com/WG21-SG14/SG14/blob/master/Docs/Proposals/NonAllocatin= gS > tandardFunction.pdf Hi Carl Can you explain somewhere why std::function is unable to do that? In other words, why must std::function allocate memory? --=20 Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/4948193.1toAHviMXG%40tjmaciei-mobl1. .