220 6058 <9bc3dfc6-49e7-412c-9b7b-3dded3e4acb8@isocpp.org> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: N3740: exempt_ptr and pointer arithmetic Date: Sat, 31 Aug 2013 18:59:44 -0700 (PDT) Lines: 105 Approved: news@gmane.org Message-ID: <9bc3dfc6-49e7-412c-9b7b-3dded3e4acb8@isocpp.org> References: <1037a4c3-905e-46ba-853e-0039af7086ae@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1559_28790484.1378000784482" X-Trace: ger.gmane.org 1378000784 15922 80.91.229.3 (1 Sep 2013 01:59:44 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 1 Sep 2013 01:59:44 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCW25A7E3QCRBEV7RKIQKGQEDNYKAVA@isocpp.org Sun Sep 01 03:59:49 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oa0-f70.google.com ([209.85.219.70]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VFwxA-0001yc-7S for gclcip-std-proposals@m.gmane.org; Sun, 01 Sep 2013 03:59:48 +0200 Original-Received: by mail-oa0-f70.google.com with SMTP id h1sf14713555oag.1 for ; Sat, 31 Aug 2013 18:59:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=latBr+5RJa1uTL3vDU9pjFZJKvqhkgZUTfr5ApXJFl0=; b=JhqZxqrs9icqQYddGM8UMum/uaHhC68um3YJCKjq9HyeOY4EIZ0QkyHee98wylMy+S mwxpCfunKLon3MJ1gSETUiMMk1SB/3nkllaWAhr8lTdilYu6fX7mRA0hDyMwxUv57nSc +R4bnRet0phixTtXJRB42Q432N/zlXdOZAs6GxKicTW/tLkkBWQEHByafHSfwF9l5573 L44ZRCpMHmQo2hn9f/oPxqE2KqQy2j8RMlE1+wY6vZtJKEsUq/tKcSo430qv364DFqEs BeK9ZJU5IJJHpKWhzOtwMdHjoTCBS29AMYkdV0Wk0rBgoGb0y1xKATQtW6RVwWwbjcHC tyRw== X-Received: by 10.42.137.1 with SMTP id w1mr9129388ict.8.1378000786755; Sat, 31 Aug 2013 18:59:46 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.22.99 with SMTP id c3ls934622igf.7.canary; Sat, 31 Aug 2013 18:59:46 -0700 (PDT) X-Received: by 10.50.66.161 with SMTP id g1mr392992igt.5.1378000786053; Sat, 31 Aug 2013 18:59:46 -0700 (PDT) In-Reply-To: <1037a4c3-905e-46ba-853e-0039af7086ae@isocpp.org> X-Original-Sender: potswa@gmail.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:6058 Archived-At: ------=_Part_1559_28790484.1378000784482 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On Sunday, September 1, 2013 8:11:20 AM UTC+8, toma...@gmail.com wrote: > > Hi,=20 > > I would like to comment N3740: Proposal for the World=92s Dumbest Smart= =20 > Pointer, v2 . > isocpp.org is usually inaccessible from my locale (APAC); I get gateway=20 timeout errors. Could someone please look into the hosting, and/or post the= =20 paper somewhere else? open-std.org works fine but the paper hasn't gone=20 into a mailing yet so the best I have is N3514, which doesn't mention=20 arithmetic. Considering that no other smart pointer models arithmetic, why should=20 exempt_ptr? =20 > - exempt_ptr for pointer representing a element of object of array= ..=20 > This one will disable conversion constructors for compatible pointer type= s=20 > but introduce pointer arithmetic and subscriptions. > Using array specialization to mean different things between unique_ptr and= =20 exempt_ptr would be quite confusing. Furthermore the proposed difference is= =20 an extended interface for array manipulation. An extended interface should= =20 be part of another class, not a subtle specialization. Although I can't read the paper yet, I definitely object to adding + and -= =20 to exempt_ptr. It's an inappropriate interface. Not only that, but it's=20 verging on iterator territory. Perhaps rather than a new specialization,=20 the extra functionality can be added as a new class std::exempt_iterator. --=20 ---=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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. ------=_Part_1559_28790484.1378000784482 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable


On Sunday, September 1, 2013 8:11:20 AM UTC+8, tom= a...@gmail.com wrote:

iso= cpp.org is usually inaccessible from my locale (APAC); I get gateway timeou= t errors. Could someone please look into the hosting, and/or post the paper= somewhere else? open-std.org works fine but the paper hasn't gone into a m= ailing yet so the best I have is N3514, which doesn't mention arithmetic.
Considering that no other smart pointer models arithmetic, why should= exempt_ptr?
 
  - exempt_ptr<T[]> for pointer representing a = element of object of array. This one will disable conversion constructors f= or compatible pointer types but introduce pointer arithmetic and subscripti= ons.

Using array specialization to mean different = things between unique_ptr and exempt_ptr would be quite confusing. Furtherm= ore the proposed difference is an extended interface for array manipulation= .. An extended interface should be part of another class, not a subtle speci= alization.

Although I can't read the paper yet, I definitely object = to adding + and - to exempt_ptr. It's an inappropriate interface. Not only = that, but it's verging on iterator territory. Perhaps rather than a new spe= cialization, the extra functionality can be added as a new class std::exempt_iterator.
<= /div>

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