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Local version of the function is called

core dump.

Virtual table is not created when constructor is called.. calls local version of the function

When Object is instantiated constructors are executed from top to bottom (Base to derived) in such case if base class constructor call virtual function it calls the base class version of that function only because base class constructor never knows that we are part of the bigger derived class. so the only implementation he can find is his own.

class Base
{
    public:
    Base()
   {
      Fun();
   }
   virtual void Fun( )
   {
     cout<<"\n I am in virtual function\n";
   }
};
class Derived:public Base
{
   public:
   void Fun()
   {
     cout<<"\n I am in the Derived class";
     Base::Fun( );
   }
};

void main()
{
  Derived d;
  Base *b = &d;
}

Code generated for Constructor of a class by compiler resolved all the function statically including virtual function called within constructor.