220 4823 article Path: news.gmane.org!not-for-mail From: Jeffrey Yasskin Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Proposal: std::sequence Date: Mon, 3 Jun 2013 09:49:03 -0700 Lines: 55 Approved: news@gmane.org Message-ID: References: <4551abbc-43aa-4520-a91a-f8eb25a90588@isocpp.org> <2c8e6079-9c87-425a-93e2-39251df57cd8@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 X-Trace: ger.gmane.org 1370278165 22321 80.91.229.3 (3 Jun 2013 16:49:25 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 3 Jun 2013 16:49:25 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDDM34EO6QDRBFESWOGQKGQE4LPUMNQ@isocpp.org Mon Jun 03 18:49:26 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yh0-f70.google.com ([209.85.213.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UjXwj-0000Hn-RF for gclcip-std-proposals@m.gmane.org; Mon, 03 Jun 2013 18:49:26 +0200 Original-Received: by mail-yh0-f70.google.com with SMTP id c41sf1749401yho.1 for ; Mon, 03 Jun 2013 09:49:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-beenthere: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-google-group-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=LUZ/u2TFP0YQafupbPoJfpYPsxCYgvQ83b4e/b5QPcU=; b=C991NajilNm/nKUs+XdpGGRjAEf1oOozzErGMUWVA2uRSDfYD7a7e0MPDAj1Zvdn1l 07fIrATc2YL0C51UBiHWjLDsVoVg8Sb/rcaFPvtkhEyuCqxQu+XreW1d1OEipJPL4z8+ UbdkUjG9hMmGUDki2qQgqaqlKVcMjjyOhyby2XdGTAadu5DgO33kd2VWPyHUW8Qgg4eQ zwImI6rsx+EpjBKSKv0bTqCu9tdfM2dCD0A2oFshUN8BHoGBeiSO/W28tNlsggokiFnG OjjUVH9JINAeO76YWI3saD8v4iys49eZ2E+QmfWgg0Llmyu4bN3IvvEp9VAJsylnomfc 8TLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-beenthere:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-gm-message-state:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-google-group-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=LUZ/u2TFP0YQafupbPoJfpYPsxCYgvQ83b4e/b5QPcU=; b=g6gfFM5kT1Ix3jTVNJsEKy8swqbXha1D31WX6eZ64DR5+p0yQBynUuwpRDZjRd0pzQ s0iSsDHKMmYcHlmXKZnmxXCwGK+jERxzzOjdsCl0gX0Ty4A6A87/NI1IMbg81x+Ihl7O lVhApp7Epcs74W1E3J1Y9cGrZseAEswqq5bBlwOIIE5RZYKHXSTmKCBWuXfdH0qp8rA0 P+jAhoEGG27aIRXS3Xi43QWgQL3cf9xcTnv/xmsRBMRm/x+h/EUpHptmEwZ9Ul132NsC vKYOE1fsjP+4VwGav5n0JPNLMTgtN9ISCoIw74rqMXedXlpt7IJh+V2d9F6uJlIobspj nCVA== X-Received: by 10.236.19.198 with SMTP id n46mr13263727yhn.8.1370278164940; Mon, 03 Jun 2013 09:49:24 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.49.64.196 with SMTP id q4ls2257160qes.72.gmail; Mon, 03 Jun 2013 09:49:23 -0700 (PDT) X-Received: by 10.224.105.75 with SMTP id s11mr19793172qao.40.1370278163708; Mon, 03 Jun 2013 09:49:23 -0700 (PDT) Original-Received: from mail-qe0-f44.google.com (mail-qe0-f44.google.com [209.85.128.44]) by mx.google.com with ESMTPS id p10si3923576qcq.138.2013.06.03.09.49.23 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 03 Jun 2013 09:49:23 -0700 (PDT) Received-SPF: pass (google.com: domain of jyasskin@google.com designates 209.85.128.44 as permitted sender) client-ip=209.85.128.44; Original-Received: by mail-qe0-f44.google.com with SMTP id 6so2503325qeb.17 for ; Mon, 03 Jun 2013 09:49:23 -0700 (PDT) X-Received: by 10.224.146.66 with SMTP id g2mr19854778qav.50.1370278163430; Mon, 03 Jun 2013 09:49:23 -0700 (PDT) Original-Received: by 10.229.80.194 with HTTP; Mon, 3 Jun 2013 09:49:03 -0700 (PDT) In-Reply-To: <2c8e6079-9c87-425a-93e2-39251df57cd8@isocpp.org> X-Gm-Message-State: ALoCoQnoHmBWobN35WnK1mEN24mBSp8yIXuD7YF0KPEx2at1hLW5hR6udelXRDPrEKuvVkQ9QPT3wFxV5GrXN5ZHytUtQm7UHLYVf5QuE73ojTzn4yO1cnn9+jNgpVu6r5w4vZ0FPf67v+Ol49ON1YDSD3jrHpe6aTsocEB3Y5yhePu0SH05yQvuijV+IkWt8Yju1+bjBsEo X-Original-Sender: jyasskin@google.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of jyasskin@google.com designates 209.85.128.44 as permitted sender) smtp.mail=jyasskin@google.com; dkim=pass header.i=@google.com; dmarc=pass (p=REJECT dis=none) d=google.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: 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:4823 Archived-At: On Mon, Jun 3, 2013 at 9:22 AM, wrote: > > On Monday, June 3, 2013 10:40:10 AM UTC-4, Jonathan Wakely wrote: >> >> This looks similar to the array_ref proposal from >> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3334.html > > > Thanks for pointing that out, Jonathan. There is much similarity to LLVM's > `llvm::ArrayRef and `llvm::MutableArrayRef`, which the array_ref proposal > drew from. I didn't know about the array_ref proposal. > > The primary differences between sequences and array_refs are: > > array_ref elements are immutable. The mutable variant > (`llvm::MutableArrayRef`) was omitted from the array_ref proposal. > sequence elements may be immutable or mutable (similar to > `llvm::MutableArrayRef`) > array_ref provides mutator member functions so that the pointer and length > of an instance's represented array may be modified (shrunk in place from > either end or reset). > sequences do not provide member or length mutators (as outlined). This was > by design; it restricts mobility and misuse, while adding some opportunity > for optimization with the expense that more temporary sequences will be > created in some scenarios. So your proposed class is not assignable? That's likely to be a problem. > The array_ref proposal adds string_ref, which is similar to array_ref with a > few extra member functions for common string operations. > > -- > > --- > 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/?hl=en. > > -- --- 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/?hl=en. .