Question

I am trying to overload the ‘>’ operator taking a pointer in parameter, however I get an error saying “operator > must have at least one parameter of type class”. I do not get that error if I do not use pointer.

Note: S1 is a typedef’d structure, as well as elem.

bool operator>(S1 const *V1, S1 const *V2){
    if (V1->elem->code > V2->elem->code)
        return true;
    return false;
}

I use the operator in a case like this, for example :

S1 * funct(S1 *var1, S1 *var2){
    if (var1 > var2)
        return var1;
    return var2;
}

Answer 1

The compiler will want to turn your example into comparing the two pointer values. Having one parameter as a class type will tell it what it needs to know to resolve the overload.

bool operator>(const S1& V1, const S1& V2){
    if (V1.elem->code > V2.elem->code)
        return true;
    return false;
}

S1 * funct(S1 *var1, S1 *var2){
    if (*var1 > *var2)
        return var1;
    return var2;
}

Also, and I’m a bit rusty on this, but I think you have to declare the operator as a friend of S1, or make it a memeber.