C++ Inheritance with functions with default parameter example

cpp_inheritance_with_functions_with_default_parameter_example.cpp

#include <iostream>
#include <string>
#include <vector>


struct A 
{
     void f_sinarg() {
         f(3);
     }
protected:
    virtual void f(int a) {
        std::cout << "A: " << a << std::endl;
    }
};

struct B : public A 
{
protected:
     void f(int a) override {
        std::cout << "B: " <<a << std::endl;
     }
};


int main()
{
    A a;
    a.f_sinarg();
    
    B b;
    b.f_sinarg();
    
    A *ab = &b;
    ab->f_sinarg();
}