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

No.

Create a method for the set and call it from the constructor. This method will then also be available for later.

class A{
    A(int a) { Set(a); }
    void Set(int a) { }
}

A instance;

instance.Set(2);

You'll also probably want a default value or default constructor.