From 3677727633594389722 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,eaf633a917dfd8af X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2003-11-10 02:38:09 PST Path: archiver1.google.com!news2.google.com!news.maxwell.syr.edu!kibo.news.demon.net!mutlu.news.demon.net!demon!mail2news.demon.co.uk!devnull From: drpizza@anti-flash.co.uk ("DrPizza") Newsgroups: comp.std.c++ Subject: Re: Passing functor-parameters in for_each() and transform() Date: Mon, 10 Nov 2003 10:38:08 +0000 (UTC) Organization: Posted via Supernews, http://www.supernews.com Lines: 36 Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: References: X-Trace: mail2news.demon.co.uk 1068460688 15237 10.0.0.1 (10 Nov 2003 10:38:08 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Mon, 10 Nov 2003 10:38:08 +0000 (UTC) X-Received: from mulga.cs.mu.oz.au ([128.250.1.22]) by news.demon.co.uk with esmtp (Exim 4.12) id 1AJ9Qs-0003xK-00 for mail2news@news.news.demon.net; Mon, 10 Nov 2003 10:38:07 +0000 X-Received: from localhost (localhost [[UNIX: localhost]]) by mulga.cs.mu.OZ.AU id VAA27463; Mon, 10 Nov 2003 21:38:03 +1100 (EST) X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Path: comp-std-cpp-robomod!not-for-mail X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Delivered-To: std-c++@ucar.edu X-Newsgroups: comp.std.c++ X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Spam-Status: No, hits=-4.9 required=5.0 tests=AWL,BAYES_10,PRIORITY_NO_NAME,QUOTED_EMAIL_TEXT,REFERENCES version=2.55 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) Xref: archiver1.google.com comp.std.c++:408 ""Alex Vinokur"" wrote in message news:bo8jui$19aso0$1@ID-79865.news.uni-berlin.de... > > Functor-parameters in the for_each() and transform() algorithms are passed by value. > > Might it make sense to have also algorithms for_each2() and transform2() > which pass Functor-parameters by non-const reference? > > > Here is some program which demonstrates probable necessity > in such forms of for_each() and transform(). It is right and proper that transform() doesn't take it by reference; that's not what transform is for. for_each appears to have no need to take it by reference because it returns a copy. -- Now Playing: Mark'Oh - Fade To Grey (Original Radio Verison) char a[99999],*p=a;main(c,V)char**V;{char*v=c>0?1[V]:V;if(c)for(;(c=*v)&&93^ c;p+=!(62^c)-!(60^c),*p+=!(43^c)-!(45^c),44^c||read(0,p,1),46^c||putchar(*p) ,91^c||(v=*p?main(-1,v+1),v-1:main(0,v)),++v);else for(;c+=!(91^*v)-!(93^*v) ;++v);return v;} /* drpizza@battleaxe.net brainf*** program as argv[1] */ --- [ 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.jamesd.demon.co.uk/csc/faq.html ]