From -7194968859768163601 X-Google-Thread: f78e5,1130da7a3640a78c X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news1.google.com!news4.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!pd7cy1no!shaw.ca!news.alt.net!comp-std-cpp-robomod!not-for-mail From: "4zumanga@gmail.com" <4zumanga@gmail.com> Newsgroups: comp.std.c++ Subject: Re: Deprecate the use of plain pointers as standard container iterators Date: 9 May 2006 21:30:05 GMT Organization: http://groups.google.com Lines: 33 Approved: Fergus Henderson , moderator of comp.std.c++ Message-ID: <1147205479.297583.272140@e56g2000cwe.googlegroups.com> References: <1146830242.416436.272780@g10g2000cwb.googlegroups.com> <1147008352.734687.154540@e56g2000cwe.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Return-Path: X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Original-To: std-c++@mailman.ucar.edu Delivered-To: std-c++@mailman.ucar.edu Delivered-To: std-c++@ucar.edu X-Trace: posting.google.com 1147205486 12474 127.0.0.1 (9 May 2006 20:11:26 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Tue, 9 May 2006 20:11:26 +0000 (UTC) User-Agent: G2/0.2 X-HTTP-UserAgent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418 (KHTML, like Gecko) Safari/417.9.2,gzip(gfe),gzip(gfe) Complaints-To: groups-abuse@google.com Injection-Info: e56g2000cwe.googlegroups.com; posting-host=84.92.249.118; posting-account=rhm8zg0AAAAB_CTpLQ2qYqQZWFJGu29h X-Greylisting: NO DELAY (Relay+Sender autoqualified); processed by UCSD_GL-v2.1 on mailbox7.ucsd.edu; Tue, 09 May 2006 13:11:29 -0700 (PDT) X-Spamscanner: mailbox7.ucsd.edu (v1.6 Aug 4 2005 15:27:38, -2.8/5.0 3.0.4) X-MailScanner: PASSED (v1.2.8 73096 k49KBTHc001574 mailbox7.ucsd.edu) X-Virus-Scanned: amavisd-new at ucar.edu X-Virus-Scanned: amavisd-new at cs.mu.OZ.AU X-Virus-Scanned: amavisd-new at cs.mu.OZ.AU Xref: g2news2.google.com comp.std.c++:1862 Peter Dimov wrote: >Nicola Musatti wrote: >> Hallo, >> I belive that the use of plain pointers as iterator types for standard >> library containers should be deprecated, because it limits genericity >> and portability. > >It also increases performance and presents more opportunities for >optimization. Can you provide an example of this on a modern optimising compiler, ie where the optimiser does better with int* i; than it does with: struct iterator { int* i }; About a year ago I spent quite a lot of time investigating if g++ 4 has any problems when vector iterators are wrapped in a class, and couldn't produce an example where the resulting assembler wasn't the same. Of course here I'm not talking about those compilers where the vector iterator has extra safety over what a plain pointer woudl provide. Most compilers provide a way to switch this off. --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.comeaucomputing.com/csc/faq.html ]