Size of virtual pointer-C++

Question

What is the size of virtual pointer(VPTR) for a virtual table in C++? Also this is not a homework question...just a question that came to my mind while I was reading a C++ b

Answer 1

An excellent article related to this topic is Member Function Pointers and the Fastest Possible C++ Delegates. This article delves deeply into the implementation of member function pointers for many different compilers. This article talks about all the nuances of vtable pointers particularly in light of multiple (and virtual) inheritance.