From 3777379411408448495 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,7b33df5790e7ad92 X-Google-Attributes: gidf78e5,public From: Gabriel Dos_Reis Subject: Re: complex design flaw (#1) Date: 1999/03/14 Message-ID: #1/1 X-Deja-AN: 454733581 Content-Transfer-Encoding: 8bit Approved: Fergus Henderson References: <01be6cf4$9f3dcc80$7d9cd4c7@danielp.interlog.com> X-Original-Date: 14 Mar 1999 01:10:33 +0100 Content-Type: text/plain; charset=iso-8859-1 X-Complaints-To: news@news.unimelb.edu.au X-Trace: izvestia.its.unimelb.edu.au 921383178 32317 128.250.29.16 (14 Mar 1999 03:46:18 GMT) Organization: I.N.R.I.A Sophia-Antipolis (France) X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUANusw7+EDnX0m9pzZAQEQxQF/WEyq3k5GQZReHADicMePRCHn9+XuYSJ2 AeGk0bOLHyAoxOWWbMkY3V2LgtuIR2xS =2T80 Mime-Version: 1.0 NNTP-Posting-Date: 14 Mar 1999 03:46:18 GMT Newsgroups: comp.std.c++ "Daniel Parker" writes: [...] | > that an implementation has special | > knowledge of entities declared/defined in the C++ standard library and | > can do some magic behind the scene. So initialiation of a vector or | > a valarray of complex may be result in a memset(). | | isn't this somewhat irrelevent to the original poster's concern? No. IMNSHO. | ... vector | and valarray are not all that useful for numerical work insofar as much | numerical work requires matrix, tensor, or n-dimensional array classes. The point I was making wasn't whether or not vector or valarray are useful for numerical work. Mr. Becker stated that because of the way the class complex is declared > construction of containers of complex are expensive. And again, I don't buy his claim for reasons I stated above. | > And optimization is a quality of implementation issue. | | Perfomance depends more on how well basic principles have been thought | through to achieve that goal. Being handed unnecessary favors like _FLT r | = 0, _FLT i = 0 is not what the numerical programmer wants. And the | original point is valid: if that's not how double or int behaves, why | should it be how complex behaves? Because it is not int nor double? See -- C compitibility. -- Gabriel Dos Reis, dosreis@cmla.ens-cachan.fr --- [ 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://reality.sgi.com/austern_mti/std-c++/faq.html ]