Does "Constructor of an abstract class" exists?

Question

We can not create an object of abstract class. And constructors create new instances of any class which is called as an object.

This is what I know about the constructor, class and object relationship.

Please correct me if I am wrong.

Answer 1

Does it exist?

#include <iostream>

class A
{
public:
    virtual void f() = 0;
    A()
    {
        std::cout << "Yes it does!" << std::endl;
    }
};

class B: public A
{
public:
    void f() {}
};

int main()
{
    B b;
    return 0;
}

Yes it does!

The technical reason is that somebody needs to initialize the members of A and that's the job of the constructor. But you can easily reason it as follows:

The inheritance relation is often termed with "is". For example, an object of type B is also of type A. In other words B is a kind of A. The constructor of A constructs an object of type A. But b above is also a kind of A, so A must have a constructor to be able to construct it.

Answer 2

Yes! It has to exist, since constructors of any child class make a call to the base constructor. (This is the simplest way to explain it)