Overload of pure virtual function

Question

I usually use pure virtual functions for those methods that are required by my code to work well. Therefore, I create interfaces and then other users implement their derived

Answer 1

Isn't overloading foo in the base class the easiest solution?

class Base
{
public:
 Base();
 virtual ~Base();
 virtual void foo(int,double)=0;
 virtual void foo(int,double,double)=0;
};