how to create multiple operator overloading in c++ object oriented programming like obj[10]=3 with [] operator and = operator

Question

i have a certain class and i want to create 2 operators that will work together

like class with array and i want to change a certain index in the array

like this obj[3]=5

is this possible? if yes,how?

this is the code i made for [] operator

double Polynomial::operator[](int index) const {
    int maxT = this->currentMax;
    if (index > 0 && index < this->getDegree(false))
        return this->coefficients[index];
    cout << "overflow in index";
    system("pause");
}

Answer 1

Your operator[] is a const method, hence it cannot be used to modify members. Unless you want to do something fancy on assigning to an element, you don't really need some operator= when your operator[] returns a reference to the element.

As mentioned in comments, doing bounds-checking in operator[] is not typical. Consider that in a loop each call to operator[] would do bounds-checking even if the user made sure that only valid indices are used. Thats not quite efficient. So in addition to your const operator you can provide this one

double& Polynomial::operator[](size_t index)  {  // <-- no const
    return coefficients[index];
}

Assuming you also have a size method you can then write a loop:

for (size_t i=0; i< poly.size(); ++i) {
    poly[i] = i;
}

PS: system("pause") is a no-go, see system("pause"); - Why is it wrong?