220 24648 <87mvqqko2z.fsf@gmail.com> article Path: news.gmane.org!not-for-mail From: Moritz Klammler Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: String class memory allocation Date: Wed, 24 Feb 2016 18:36:20 +0100 Lines: 46 Approved: news@gmane.org Message-ID: <87mvqqko2z.fsf@gmail.com> 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 1456335393 30799 80.91.229.3 (24 Feb 2016 17:36:33 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 24 Feb 2016 17:36:33 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDHI7IWJYALRBGGUW63AKGQEUL5LA7Y@isocpp.org Wed Feb 24 18:36:27 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f199.google.com ([209.85.217.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aYdMQ-0004j9-Iy for gclcip-std-proposals@m.gmane.org; Wed, 24 Feb 2016 18:36:26 +0100 Original-Received: by mail-lb0-f199.google.com with SMTP id h8sf9264872lbh.3 for ; Wed, 24 Feb 2016 09:36:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:in-reply-to:message-id:user-agent:mime-version :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=qDY+qeSZOd5/6xI6sDl6NqJs7bTsOgkkbPZO7gcI4YE=; b=yKNmZ0BD09vVQDWFyBCbVZuKdJTB3UKl8vltC0rDWjBe48dAdicpatdfEriGT0om/s ZR9i5uzxU3oa5HgClNvo2RBNW3U2RgZm9chN4wDFc+lNO8zIPPHHK2M3xIlzqNO/+igE vTBKRbGcqLVydq2U22BIKF9EbRj0L3gxjz0hnkc37ScWdYI2Ol5rzGGsZkg5L48rv29o Ge4WAJU+pe+jq9fg+BsdPJ5r27/6kLxod/LL9vgpdb9Sv6k9u8N+lsrF+NxKrA8lxrxL bnddu3lFttRFYONqFVPN+lAXQ+Qfn7vOj4a7NBx2hvUvUi05uZqiuJTMf0y1XHc+fq4z 3DAw== 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:in-reply-to:message-id :user-agent:mime-version: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=qDY+qeSZOd5/6xI6sDl6NqJs7bTsOgkkbPZO7gcI4YE=; b=KybmV0yhAUFe2nrgy0TEOyVUecBJjbUmBsSSkx/kxHCw67NEZvKwPc3V0h0R7xmzHg kjXI7XOnJP010JV5/IOuY2Og5JHB5Y4OEP7SSZl0EkmjnSHKBWJ7WkuVyI5e1ZMYnOnn qudc+T++aWgZQehJvbxdyeiTSwZMrmQpdr5y1KMpQxHakRl0FxYUuELV6xc79QgyJL75 Khcn6eApPWJhMH7H9Zbqey1Vxqj6cSX+oe2Jqhkgu6KtBuZpE+eTRqKe0lekQ9GKGWdd OBbfeYQGTK6NRqmEb5aDAG5e0qL5q86gD/2/TkCDumAzDVmvTLFe6nGjpZDJYEPU0z+E nE3Q== X-Gm-Message-State: AG10YOSECkMPxfCeXoTz8VBFnsZwOYoxxWLGIGweBdsWjYHPN2F2k05Q4J3V1WYnmPvm4g== X-Received: by 10.28.6.14 with SMTP id 14mr2831107wmg.6.1456335386072; Wed, 24 Feb 2016 09:36:26 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.126.130 with SMTP id z124ls129529wmc.19.gmail; Wed, 24 Feb 2016 09:36:24 -0800 (PST) X-Received: by 10.194.123.35 with SMTP id lx3mr39662683wjb.132.1456335384051; Wed, 24 Feb 2016 09:36:24 -0800 (PST) Original-Received: from mail-wm0-x22d.google.com (mail-wm0-x22d.google.com. [2a00:1450:400c:c09::22d]) by mx.google.com with ESMTPS id w4si4751412wje.208.2016.02.24.09.36.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 Feb 2016 09:36:24 -0800 (PST) Received-SPF: pass (google.com: domain of moritz.klammler@gmail.com designates 2a00:1450:400c:c09::22d as permitted sender) client-ip=2a00:1450:400c:c09::22d; Original-Received: by mail-wm0-x22d.google.com with SMTP id g62so283259289wme.1 for ; Wed, 24 Feb 2016 09:36:24 -0800 (PST) X-Received: by 10.28.136.19 with SMTP id k19mr24063572wmd.11.1456335383847; Wed, 24 Feb 2016 09:36:23 -0800 (PST) Original-Received: from moritz-desktop (HSI-KBW-46-223-128-55.hsi.kabel-badenwuerttemberg.de. [46.223.128.55]) by smtp.gmail.com with ESMTPSA id w144sm32185084wmd.8.2016.02.24.09.36.21 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 Feb 2016 09:36:22 -0800 (PST) In-Reply-To: Robin Rowe's message of "Wed\, 24 Feb 2016 08\:28\:33 -0800 \(1 hour\, 6 minutes\, 1 second ago\)" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) X-Original-Sender: moritz.klammler@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of moritz.klammler@gmail.com designates 2a00:1450:400c:c09::22d as permitted sender) smtp.mailfrom=moritz.klammler@gmail.com; dkim=pass header.i=@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:24648 Archived-At: Given that we already have `std::array` and almost certainly will have `std::string_view` soon, I think that this isssue is solved. Robin Rowe writes: > What's in the standard to avoid heap allocation during string creation? > > Is there a standard string class that doesn't use 'new', that works something > like this? > > template > class FixedLengthString > { char buffer[bufsize] > public: > ... [ typical string interface ] > }; > > FixedLengthString<80> s("hello world"); > > Is there a standard memory pool class, something like this? > > template > class MemoryPoolString > { static MemoryPool memoryPool;//shared by all strings > char* buffer; > public: > MemoryPoolString() > { if(!memoryPool) > { memoryPool.Create(poolsize); > } > buffer=0; > } > ... > }; > > My reason for caring is the cost of calling new on every string creation. > > Robin -- 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/87mvqqko2z.fsf%40gmail.com. .