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For this code: class B1{ public: virtual void f1() {} }; class D : public B1 { public: void f1() {} }; int main () { B1 *b1 = new B1(); D *d = new D(); return 0; } After compilation, the vtable I get with g++ -fdump-class-hierarchy is: Vtable for B1 B1::_ZTV2B1: 3u entries 0 (int (*)(...))0 8 (int (*)(...))(& _ZTI2B1) 16 B1::f1 Vtable for D D::_ZTV1D: 3u entries 0 (int (*)(...))0 8 (int (*)(...))(& _ZTI1D) 16 D::f1 I failed to understand what do the entries like (int ( )(...))0* correspond to. Of course it means something like, it is a function which returns an int and takes unlimited number of arguments, I don't understand anything further. To which function does this function pointer correspond to? and how do you know that? Mine is a 64 bit machine. The second function pointer has an address associated at end?? To whom does that correspond to? EDIT The compiler, I use is g++: g++ -v Using built-in specs. Target: x86_64-suse-linux Configured with: ../configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64 --enable-languages=c,c++,objc,fortran,obj-c++,java,ada --enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.4 --enable-ssp --disable-libssp --with-bugurl=http://bugs.opensuse.org/ --with-pkgversion='SUSE Linux' --disable-libgcj --disable-libmudflap --with-slibdir=/lib64 --with-system-zlib --enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch --enable-version-specific-runtime-libs --program-suffix=-4.4 --enable-linux-futex --without-system-libunwind --with-arch-32=i586 --with-tune=generic --build=x86_64-suse-linux Thread model: posix *gcc version 4.4.1 [gcc-4_4-branch revision 150839] (SUSE Linux)*

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