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

Calling instance.A() or A(1) is seens as casting  'function-style cast' : illegal as right side of '.' operator

Usually if a function/functionality is to needed in constructor as well as after object is construted it is placed in init() methode and used in constructor and in other place too.

example:

 class A{
      A(int a)
       { 
        init(a);
       }

     void init(int a) { } 
     }

        A instance;

        instance.init(2);