C++: string operator overload

Question

Can I overload existing function/operator in existing class?

I was trying to do:

#include 
#include 
using namespace std;

         


        

Answer 1

You can't add member functions to a class unless you modify that class' definition. Use a free function instead:

string& operator<<(string & lhs, const string & rhs) {
    return lhs += rhs;
}