Can you invoke an instantiated object's class constructor explicity in C++?

Question

After creating a instance of a class, can we invoke the constructor explicitly? For example

class A{
    A(int a)
    {
    }
}

A instance;

instance.A(2);
         


        

Answer 1

I am pretty sure you can't do that. That's the whole point, constructor IS creation of an instance of the class.

If a constructor is not called at all, or is called twice - which consequences could it have?

What you could do of course, is extracting some constructor logic into the method, and calling that method both in the constructor and after creation of the object.