Question

How to call an overloaded operator in another member function of a class in C++ ?

Answer 1

Assuming it’s overloaded as a member, you generally use (*this)operator<parameter(s)>, so if a class has an overload of operator[] that takes, say, an int parameter (e.g., T &operator[](int index);), another member function can invoke it with (*this)[2].

If it’s overloaded as a free function, you do pretty much the same sort of thing. For example, assuming you had a free function like:

my_string operator+(my_string const &a, my_string const &b);

You could invoke it from a member function like:

my_string operator+(my_string const &other) { 
   return (*this) + other;
}

Probably not useful in quite this simplistic of a case, but still shows the general idea.