重载运算符+ = c ++时出错

Question

I'm trying to overload operator += on a class named Movie:

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

gives me error Movie.h:47:10: error: with 'Movie& Movie::operator+=(const Movie&)' how do i over load it..?

Answer 1

Despite reported problem, the code is structurally incorrect. It calls an assignment operator inside += operation, which is not neccessary and is just a performance drag. Instead, operator += should be properly coded with modification to the object, and operator + expressed in the terms of +=.