Some confusion regarding virtual funtion in C++

Hi All,

I am having a confusion regarding virtual functions that can be described by example shown below:


class BaseClass{
public:
virtual void Fun();

};
class Derived : public BaseClass
{
public:

};

I want to know that Will there will be any vTable inside the "Derived" class?
Well I found the size of class "Derived" is 4, so what maked its size of 4 bytes? Please justfy with explaination.


Thanks in Advance.
Mayank