friend function prob.

[waxydock]

hi,

ive made the following operator a friend because i need to access the private vector<int> set...but for some reason it gives me the following compile error
IntSet.h: In function `const IntSet operator+(const IntSet&, const IntSet&)':
IntSet.h:29: error: `std::vector<int, std::allocator<int> > IntSet::set' is
private
IntSet.cc:80: error: within this context

please note this is line 80:

 for (constSetIterator it = b.set.begin(); it!=b.set.end(); ++it) {

..y?

/* returns a union of the sets a and b */
const IntSet operator+(const IntSet &a, const IntSet &b){

       IntSet newSet = a;

       for (constSetIterator it = b.set.begin(); it!=b.set.end(); ++it) {
           if (!newSet.contains(*it))
              newSet.add(*it);
       }

       return newSet;
}

its protoype in the .h file is

friend IntSet operator+(const IntSet a, const IntSet b);