The Example In Lesson

Question

"
class MyClass {
public:
int var;
MyClass() {}
MyClass(int a)
: var(a) { }

MyClass operator+(MyClass &obj) {
MyClass res;
res.var= this->var+obj.var;
return res;
}
};
" in this example, why do we need '&' ?

Answer 1

it is pass by reference. we do not need it for a simple operation like thst tho, but that may be just faster to do it that way (for PC, not for you).
http://www.learncpp.com/cpp-tutorial/73-passing-arguments-by-reference/

Answer 2

thanks!