From 5836651164753899931 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,942dd48e323646a4 X-Google-Attributes: gidf78e5,public From: Ole Reinartz Subject: Re: const static member in a class Date: 2000/05/26 Message-ID: <392E5925.6BABB160@gmx.de>#1/1 X-Deja-AN: 627579348 Content-Transfer-Encoding: 7bit Approved: Fergus Henderson , moderator of comp.std.c++ References: <3908CCBC.E02307C@hotmail.com> X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f Content-Type: text/plain; charset=us-ascii X-Complaints-To: abuse@demon.net X-Mail2News-Path: news.demon.net!mulga.cs.mu.oz.au X-Trace: mail2news.demon.co.uk 959347458 mail2news:24908 mail2news mail2news.demon.co.uk Organization: Nokia X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) MIME-Version: 1.0 NNTP-Posting-Date: Fri, 26 May 2000 13:29:10 EET DST Newsgroups: comp.std.c++ Francis Glassborow wrote: > In article <3908CCBC.E02307C@hotmail.com>, Yaxun Liu > writes > >Hi, > > I wonder whether the following codes satisfy the C++ standard, > > > >class A > >{ > >public: > >static const int m_a=1; > >}; > > > >I've seen some people used such codes, however, it caused compling error > > > >in VC++5.0. I was rather confused. > > This one is not really MS's fault as in class initialisation of static > const data (integer types only) was a late tweak to the Standard. In > addition you still have to define the variable exactly once somewhere in > your program (for the linker) > AFAIK in that special case you dont even have to define it for the linker somewhere, because it is a constant. Because it will never change it doesnt have to have a fixed location. The compiler is even allowed to optimize it to a literal constant (like it would do when you would #define m_a 1). Still the type savety remains. Also I think (didnt look it up in the standard though) that it works for all the builtin types. Ole --- [ 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 ]