When Is Vptr Initialized?

When an object containing virtual functions is created, its VPTR must be initialized to point to the proper VTABLE. This must be done before there's any possibility of calling a virtual function.

Where is VPTR initialized?

it's initialized between the constructors of base and derived classes: class Base { Base() { } virtual void f(); }; class Derived { Derived(); virtual void f(); }; It happens when raw memory is converted to Base object. It happens when Base object is converted to Derived object during construction of an object.

When VPTR is created in c++?

# VPTR is a hidden pointer created by compiler implicitly. # If base class pointer pointing to a function which is not available in base class then it will generate error over there. # Memory of Vtable and VPTR gets allocated inside the process address space.