Can I overload pure virtual method in the base class?

Question

In the example below I have a abstract class with pure virtual method (aka FUN1) and a normal method (aka FUN2).

#include 

class A
{
public:         


        

Answer 1

Try to add using A::fun; statement in B class :

#include 

class A
{
public:
    virtual void fun(int i) = 0; // FUN1
    void fun() { this->fun(123); } // FUN2
};

class B : public A
{
public:
    using A::fun;
    virtual void fun(int i) { std::cerr << i << std::endl; }
};

int main(int, char**)
{
    B b;
    b.fun();
    b.fun(5);
}