重载必须返回对象引用的运算符

Question

class LongInt
{
public: LongInt& operator++(); //returning a reference
}

LongInt LongInt::operator++()
{
    ...

    LongInt d;


    d.setVector(temp);






    return d; //returning a reference to an object that will be wiped out because it is out of scope

}

I am kinda confused here. I apparently have to return by reference to overload the increment operator, but I don't think that's even possible. I get a memory fault, because the object my pointer is pointing to disappears. So how should I overload the ++ operator?

Answer 1

修改对象本身，然后返回*this 。