C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Table of virtual methods          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Milan Cermak Guest Posted: Mon Jun 28, 2004 7:46 pm    Post subject: Table of virtual methods Hi all, I have sort of philosophical question. Contructor and destructor behavior points me to this. Is table of virtual methods held in object? Do I get it right that every created object has its own table of virtual methods? Even if they are of one class? Thanks for reactions, Milan Cermak Back to top Howard Guest Posted: Mon Jun 28, 2004 8:22 pm    Post subject: Re: Table of virtual methods "Milan Cermak" <nil (AT) nil (DOT) nil> wrote Quote: Hi all, I have sort of philosophical question. Contructor and destructor behavior points me to this. Is table of virtual methods held in object? There is no specificationin the standard as to how the addresses of virtual methods are stored. Quote: Do I get it right that every created object has its own table of virtual methods? Even if they are of one class? No, that's not true. Whether they are virtual or not, the member functions (and pointers to them in the case of virtual functions) only need to be stored somewhere once per class (or struct) type. There's no need to copy those for every object. That would be *very* wasteful. Quote: Thanks for reactions, Milan Cermak Back to top John Harrison Guest Posted: Mon Jun 28, 2004 8:32 pm    Post subject: Re: Table of virtual methods "Milan Cermak" <nil (AT) nil (DOT) nil> wrote Quote: Hi all, I have sort of philosophical question. Contructor and destructor behavior points me to this. Is table of virtual methods held in object? Do I get it right that every created object has its own table of virtual methods? Even if they are of one class? Typically each object holds a pointer to a table of virtual methods (actually pointers to virtual methods). There is one table for each class, and every object of the same class has the same pointer. Multiple and virtual inheritance complicate this picture however. If you are interested have a look at the book 'Inside the C++ Object Model' by Stanley Lippman. john Back to top EventHelix.com Guest Posted: Tue Jun 29, 2004 10:47 am    Post subject: Re: Table of virtual methods The following articles will clear up some of these issues: http://www.eventhelix.com/RealtimeMantra/basics/ComparingCPPAndCPerformance.htm http://www.eventhelix.com/RealtimeMantra/basics/ComparingCPPAndCPerformance2.htm Sandeep -- http://www.EventHelix.com/EventStudio EventStudio 2.0 - Generate Sequence Diagrams in PDF (no drawing required) 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 (comp.lang.c++) 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.