Accessing class members on a NULL pointer

Question

I was experimenting with C++ and found the below code as very strange.

class Foo{
public:
    virtual void say_virtual_hi(){
        std::cout << \"Vi         


        

Answer 1

The say_hi() member function is usually implemented by the compiler as

void say_hi(Foo *this);

Since you don't access any members, your call succeeds (even though you are entering undefined behaviour according to the standard).

Foo doesn't get allocated at all.