Реализовать оператор индекса в классе

#include <iostream>
#include <cstring>
#define _CRT_SECURE_NO_WARNING
 
class Book{
    
    public:
    
    Book(char const* Author, char const* BookName){
        
        _Author = new char[50];
        strcpy(_Author, Author);
        
        _BookName = new char[50];
        strcpy(_BookName, BookName);
        
    }
    
    Book(const Book & other){
        
        _BookName = other._BookName;
        _Author = other._Author;
    }
    
    const char* getAuthor(){
        return _Author;
    }
    
    const char* getName(){
        return _BookName;
    }
    
    ~Book(){
        
        delete[] _Author;
        delete[] _BookName;
    }
    private:
    
    char* _BookName;
    char* _Author;
 
};
 
 
int main()
{
   int BookNumber = 1;
   
   Book b1("Stephen King", "The Green Mile"); 
   std::cout <<"Book number: "<< BookNumber++ <<"\nAuthor of this book is " << b1.getAuthor() <<"\nBook\'s name is \"" << b1.getName() <<"\"" << std::endl;
   std::cout <<"\n";
   
   Book b2(b1); 
   std::cout <<"Book number: "<< BookNumber++ <<"\nAuthor of this book is " << b2.getAuthor() <<"\nBook\'s name is \"" << b2.getName() <<"\"" << std::endl;
   std::cout <<"\n";
   
   
}