Theoretically, the vtable conatins pointer to each virtual function of the class. Each object of this class contains a pointer called vptr to this virtual table. But will the space occupied by the v-table be part of the memory occupied by the class? If the memory needed by v-table is part of class, then the class memory size will be increased by 4n, where n is the number of virtual functions in the class and the machine is 32 bit.
Please correct me if I am wrong. Would appreciate if someone clarifies if the vtable is created in class memory or in any other memory space. -- Thanks, Amit Kumar Basak On Tue, Mar 29, 2011 at 1:47 AM, hammett <hamm...@gmail.com> wrote: > Off the top of my head, virtual functions are implemented through > v-tables http://en.wikipedia.org/wiki/Virtual_table > The size should be the size of a native pointer (4 bytes in 32 > machines) but I could be wrong. > > > On Mon, Mar 28, 2011 at 11:37 AM, himanshu kansal > <himanshukansal...@gmail.com> wrote: > > can u gv any link for reference...??? > > > > On Sat, Mar 26, 2011 at 12:29 PM, D.N.Vishwakarma@IITR < > deok...@gmail.com> > > wrote: > >> > >> there is vtable known as virtual table which contains addresses of > virtual > >> functions . > >> And there is vptr a pointer that points to vtable of that class space > >> occupied by class having virtual function wil be equal to space occupied > by > >> a pointer * number of virtual functions .. > >> I think this if there is any correction please let me know... > >> > >> On Sat, Mar 26, 2011 at 12:00 PM, himanshu kansal > >> <himanshukansal...@gmail.com> wrote: > >>> > >>> wht is the space occupied by a class in c++ whn it contains a virtual > >>> fn..... > >>> How are the virtual fn implemented internally by c++....... > >>> > >>> -- > >>> You received this message because you are subscribed to the Google > Groups > >>> "Algorithm Geeks" group. > >>> To post to this group, send email to algogeeks@googlegroups.com. > >>> To unsubscribe from this group, send email to > >>> algogeeks+unsubscr...@googlegroups.com. > >>> For more options, visit this group at > >>> http://groups.google.com/group/algogeeks?hl=en. > >>> > >> > >> > >> > >> -- > >> With Regards > >> Deoki Nandan Vishwakarma > >> IITR MCA > >> Mathematics Department > >> > >> -- > >> You received this message because you are subscribed to the Google > Groups > >> "Algorithm Geeks" group. > >> To post to this group, send email to algogeeks@googlegroups.com. > >> To unsubscribe from this group, send email to > >> algogeeks+unsubscr...@googlegroups.com. > >> For more options, visit this group at > >> http://groups.google.com/group/algogeeks?hl=en. > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Algorithm Geeks" group. > > To post to this group, send email to algogeeks@googlegroups.com. > > To unsubscribe from this group, send email to > > algogeeks+unsubscr...@googlegroups.com. > > For more options, visit this group at > > http://groups.google.com/group/algogeeks?hl=en. > > > > > > -- > Cheers, > hammett > http://hammett.castleproject.org/ > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to algogeeks@googlegroups.com. > To unsubscribe from this group, send email to > algogeeks+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
