220 18437 <0f46f119-457e-4e49-aa64-ab45e0115a21@isocpp.org> article Path: news.gmane.org!not-for-mail From: german.diago@hubblehome.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Exposing string small string optimization size to avoid heap allocation. Date: Fri, 5 Jun 2015 22:28:03 -0700 (PDT) Lines: 95 Approved: news@gmane.org Message-ID: <0f46f119-457e-4e49-aa64-ab45e0115a21@isocpp.org> References: <19736033-58d4-441d-ae73-19804f8ef575@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_246_19031279.1433568483196" X-Trace: ger.gmane.org 1433568487 17243 80.91.229.3 (6 Jun 2015 05:28:07 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 6 Jun 2015 05:28:07 +0000 (UTC) Cc: german.diago@hubblehome.com To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDKJVOEEVYNRBZEJZKVQKGQEONSGYLA@isocpp.org Sat Jun 06 07:28:06 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f69.google.com ([209.85.220.69]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Z16eM-0002U4-57 for gclcip-std-proposals@m.gmane.org; Sat, 06 Jun 2015 07:28:06 +0200 Original-Received: by pacso2 with SMTP id so2sf171610631pac.2 for ; Fri, 05 Jun 2015 22:28:04 -0700 (PDT) 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:cc:message-id:in-reply-to :references:subject:mime-version:content-type: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=ak9c4Yd/hyinFulaw5Jbd2djb267tvdAfiem9bN7naA=; b=BFXk0fCrjRQxXksGVXeWNwrb48U1hhs9aRlqWU3iUwnrpfKGeFy1VNfRKgMG0U26xw FBBWhsNuVvQh9b5DLv1kMK04dQw2T5mA+6tks5BBcur74hbsX76Hd73tl2lj2wk78jgp +cpgCdSkLp6teZFxKT+OfF9KCmxq2hnF/yFvuBiUaFgGT42/kqBR+2HilIqEqT1sSNIv efgUsoc+W56F31/bw4rGGju1n/ntVTQYZr00f6Ac76XMovzE5SspmoGnP8BkKfreY5IQ q6xJJ57jLv2wHMYfvD2Fp2YjTPEUEhzGF5Rzy72IigdER/u86DjHiazdlthRzBWZeZ7v 4Myg== X-Gm-Message-State: ALoCoQnNcHmahaX2nJUyhaXQdT9mSGZCszkrVu8+5WbK68NvPFRe96ESWcfjn0D5idjt6oM2Rq0G X-Received: by 10.70.54.130 with SMTP id j2mr8560635pdp.14.1433568484745; Fri, 05 Jun 2015 22:28:04 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.122.67 with SMTP id lq3ls754109igb.17.canary; Fri, 05 Jun 2015 22:28:04 -0700 (PDT) X-Received: by 10.50.13.9 with SMTP id d9mr25346igc.9.1433568483985; Fri, 05 Jun 2015 22:28:03 -0700 (PDT) In-Reply-To: <19736033-58d4-441d-ae73-19804f8ef575@isocpp.org> X-Original-Sender: german.diago@hubblehome.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:18437 Archived-At: ------=_Part_246_19031279.1433568483196 Content-Type: multipart/alternative; boundary="----=_Part_247_2031126397.1433568483196" ------=_Part_247_2031126397.1433568483196 Content-Type: text/plain; charset=UTF-8 On Saturday, June 6, 2015 at 12:14:16 PM UTC+7, german...@hubblehome.com wrote: > > Hello everyone, > > I would like to know if there would be interest in a proposal for > detecting when a string allocates in the heap. > > The rationale for this is that there are environments in which heap > allocations should be forbidden, > but use of short strings can still be made, with the convenience of string > functions. > Embedded environments are such an example: > > > A static member function (or free?) could be provided. Something like: > > //Pseudo-C++, no basic_string here to go straight to the question > class string { > public: > static std::size_t max_stack_allocated_size(); > static bool needs_dynamic_allocation(std::size_t sz); > }; > > I forgot constexpr: //Pseudo-C++, no basic_string here to go straight to the question class string { public: static constexpr std::size_t max_stack_allocated_size(); static constexpr bool needs_dynamic_allocation(std::size_t sz); }; -- --- 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/. ------=_Part_247_2031126397.1433568483196 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Saturday, June 6, 2015 at 12:14:16 PM UTC+7, ge= rman...@hubblehome.com wrote:
<= div dir=3D"ltr">Hello everyone,

I would like to know if = there would be interest in a proposal for detecting when a string allocates= in the heap.

The rationale for this is that there= are environments in which heap allocations should be forbidden,
= but use of short strings can still be made, with the convenience of string = functions. 
Embedded environments are such an example:
=


A static member function (or free?) coul= d be provided. Something like:

//Pseudo-C++, no ba= sic_string here to go straight to the question
class string {
   public:
       static std= ::size_t max_stack_allocated_size();
       s= tatic bool needs_dynamic_allocation(std::size_t sz);
};

I forgot constexpr:

<= /div>
//Pseudo-C++, no basic_string here to go straight to the que= stion
class string {
   public:
&nb= sp;      static constexpr std::size_t max_stack_allocated_si= ze();
       static constexpr bool needs_dyna= mic_allocation(std::size_t sz);
};

--

---
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To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
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