Overloading in c++

Question

Why we can't overload '=' by using frnd fn?

Answer 1

It is because assignment operator is one of the "special member operator" in C++ ( special member functions are the functions which are generated by compiler if it doesn't find one at the time of its use )
If you attempt to overload it via friend function, then your definition would conflict with compiler generated definition causing ambiguity ( resulting in compilation error )