C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  forward declaration          C++Talk.NET Forum Index -> C++ language, library and standards View previous topic :: View next topic   Author Message fa Guest Posted: Mon Jul 28, 2003 4:55 pm    Post subject: forward declaration hi all, following the standard what is allowed in forward declarations beetween: 1) class a_class; //forward declaration class another_class { a_class object; }; 2) class a_class class another_class { a_class* object } 3) class a_class; //forward declaration class another_class : public a_class { }; it seems on my compiler that just the 2nd one does compile. more, what the standard says about the standard library? at my knolewdge with members of the standard librery forward declarations are not permitted, isn'it? thanks --- [ 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 ] Back to top Richard Smith Guest Posted: Mon Jul 28, 2003 7:08 pm    Post subject: Re: forward declaration fa wrote: Quote: 1) class a_class; //forward declaration class another_class { a_class object; }; This is not legal. All members must be complete. Quote: 2) class a_class class another_class { a_class* object } This is perfectly OK. Quote: 3) class a_class; //forward declaration class another_class : public a_class { }; Again, this is not legal. Base classes must also be complete. Quote: what the standard says about the standard library? at my knolewdge with members of the standard librery forward declarations are not permitted, isn'it? I'm not sure I understand the question. If you're asking whether you are allowed to forward declare classes that are defined in the standard library, then the answer is no. -- Richard Smith --- [ 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 ] Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language, library and standards All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.