how to determine the size of virtual base class and derived classes from it?

Question

#include 
using namespace std;

class base1{};
class base2{virtual void show(){}};

class test1{    };
class test2{virtual void show(){}};

class der         


        

Answer 1

My old paper "C++: Under the Hood" explains the Microsoft C++ implementation of virtual base classes. http://www.openrce.org/articles/files/jangrayhood.pdf

And you can compile with cl /d1reportAllClassLayout to get a text report of class memory layouts.

Happy hacking!