Override number of parameters of pure virtual functions

Question

I have implemented the following interface:

template 
class Variable
{
public:
  Variable (T v) : m_value (v) {}
  virtual void Callback ()         


        

Answer 1

Even if such a thing were possible, it no longer makes much sense to have it as a virtual function, as the derived instantiations couldn't be called polymorphically via a pointer to the base class.