Question

Possible Duplicate:
c++ publicly inherited class member cannot be used as default argument
Nonstatic member as a default argument of a nonstatic member function

LinkedInteger accessElement(int index, LinkedInteger *startElement=&DataArray[0]){ // Starting at *startElement*, returns the element which is at the index of *startElement+index

    LinkedInteger NullElement;
    if (index<0){
        cout << "Index degeri sifirdan buyuk olmalidir" << endl;
        NullElement.value=0;
        NullElement.nextPtr=0;
        return NullElement;
    }       
    for (int i=0; i<index; i++){
        if (startElement->nextPtr == NULL){ // Last elements index is null.
            cout << " Erismeye calistiginiz eleman dizi sinirlarinin disindadir " << endl;
            NullElement.value=0;
            NullElement.nextPtr=0;
            return NullElement;}
        else {
            startElement=startElement->nextPtr;
        }
    }
    return *startElement; 
}

This is a method in implementation of Linked Lists in c++, which simply lets access to lists elements
I want to give the header as a default argument (which is indeed DataArray[0]).
It fails because of the error “invalid use of non-static data member”.

this->&DataArray[0]

also fails because of “this may not be used in this context” What should I do?

Also there are some issues with the context of the code. Please ignore them.

Answer 1

Use an overload:

LinkedInteger accessElement(int index){
  return accessElement(index, &DataArray[0]);
}