From 6010766297045274417 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,fcf9039f47123dd0 X-Google-Attributes: gidf78e5,public Path: controlnews3.google.com!news1.google.com!news.glorb.com!fr.ip.ndsoftware.net!proxad.net!proxad.net!194.159.246.34.MISMATCH!kibo.news.demon.net!mutlu.news.demon.net!demon!mail2news.demon.co.uk!devnull From: nesotto@cs.auc.dk ("Thorsten Ottosen") Newsgroups: comp.std.c++ Subject: Re: Dear All, Date: Fri, 30 Apr 2004 03:14:41 +0000 (UTC) Lines: 43 Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: <4090476b$0$25012$afc38c87@news.optusnet.com.au> References: <408df3b1$0$436$afc38c87@news.optusnet.com.au> X-Trace: mail2news.demon.co.uk 1083294881 12759 10.0.0.1 (30 Apr 2004 03:14:41 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Fri, 30 Apr 2004 03:14:41 +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 1BJOU4-0003Je-00 for mail2news@news.news.demon.net; Fri, 30 Apr 2004 03:14:41 +0000 X-Received: from mulga.cs.mu.OZ.AU (localhost [127.0.0.1]) by mulga.cs.mu.OZ.AU with ESMTP id i3U3Eai2016854; Fri, 30 Apr 2004 13:14:36 +1000 (EST) X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id i3U3Ea0E016844; Fri, 30 Apr 2004 13:14:36 +1000 (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 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.60-mulga_r1 (1.212-2003-09-23-exp) on mulga.cs.mu.OZ.AU X-Spam-Status: No, hits=0.7 required=5.2 tests=AWL,PRIORITY_NO_NAME autolearn=no version=2.60-mulga_r1 Xref: controlnews3.google.com comp.std.c++:21 "Michiel Salters" wrote in message news:fcaee77e.0404280424.54399c9a@posting.google.com... [snip] | Why would there be a large overhead? | template< typename Matrix > | class mean_vector_return { | friend mean_vector_return( Matrix const& argument ); | Matrix const& argument; | public: | template< typename Vector > | operator Vector() { /* real implementation */ } | }; I see, clever :-) | template< typename Matrix > | inline mean_vector_return mean_vector( Matrix const& argument ) | { | return mean_vector_return( argument ); | } | Basically, everything except the operator T could be inlined. The | operator Vector actually implements the intended | mean_vector() function. I guess it works then, but it leaves some issues: 1. it seems quite strange to put the implementation in a conversion operator instead of in the function body 2. all function prototypes would have to look like template< class T > foo_return foo( T const& ); br Thorsten --- [ 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 ]