Overloading << Issue

It is to my understanding to overload the output operator (<<) you must declare the function as standalone - OK.

And also if you want to access the private data you need to make it a "friend" of the class - OK.

But when I compile, I get a undeclared identifier error.. Any help would be appreciated.

Friend declaration in my .h file under public:

Code:

---

friend        ostream& operator<<(ostream&, GList);

---

Stand-alone function (end and list are private data members):

Code:

---

ostream& operator<<(ostream& out, GList list)
{
        for(int i = 0; i < end; i++)
        {
                out << list[i];
        }

        return out;
}

---

Output errors:
error C2065: 'end' : undeclared identifier
error C2676: binary '[' : 'GList' does not define this operator or a conversion to a type acceptable to the predefined operator

Thanks in advance..

See if this helps:

Code:

---

#include <iostream>
using namespace std;

class GList
{
private:
        int end;
        int* pArray;

public:
        GList(int size, int* anArray)
        {
                end = size;
                pArray = anArray;
        }

        friend ostream& operator<<(ostream&, const GList&);
};

ostream& operator<<(ostream& out, const GList& list)
{
        for(int i=0; i<list.end; i++)
        {
                out<<list.pArray[i]<<endl;
        }

        return out;
}

int main()
{
        int size = 3;
        int arr[] = {10, 20, 30};
        GList myList(size, arr);

        cout<<myList;

        return 0;
}

---

Note: you should make the GList parameter a reference to avoid having to copy the object for the function, and you should make it a const since the function doesn't need to change the GList object.