Accessing Nested Class Member Function in CPP

In case of nested class, how do I access the "Inner" or "Child" class's member function?. For example, the code, where I created "obj1". Now how do I access the "childPrint()" with"obj1"?

example_code:

#include<iostream>
using namespace std;

/////////////////////////////////////////////////
class Parent
{
public:
    void print()
    {
        cout<<"this is from Parent"<<endl;
    }
    class Child
    {
    public:
        void childPrint()
        {
            cout<<"this is from Child"<<endl;
        }
    };
};



int main()
{
    Parent obj1;
    obj1.print();

    Parent::Child obj2;
    obj2.childPrint();

    obj1.Child::childPrint();///ERROR


    return 0;
}

obj1.Child::childPrint();

In this particular line, you need to understand that childPrint() is an instance member function of class Child. So, only an instance of class Child can call childPrint() function.

If childPrint() function is a static member function(class function) of class Child then it is possible to call it without creating any instance and no error will be shown in Parent::Child::childPrint();.