Why would the conversion between derived* to base* fails with private inheritance?

Question

Here is my code -

#include
using namespace std;

class base
{
public:
    void sid()
    {
    }  
};

class derived : private base
{
public:         


        

Answer 1

You need to declare your sid() function in the base class as virtual. A virtual function can be replaced by a derived class. Otherwise, you would likely get a compiler error.