I am trying to use a member function as a friend.  The following simple example
seems to be straight forward, yet it will not compile.  I used Sparcworks, gcc and
centerline.

Help...

Thanks...

dvw...

=============================================
#include <iostream.h>

class alpha;
class beta;
class ab;

class alpha
{
 public:
  alpha() { data = 3; };
 private:
  int data;
  friend int add_a_b(alpha,beta);
  friend int ab::add_a_b(alpha,beta);
};

class beta
{
 public:
  beta() { data = 7; };
 private:
  int data;
  friend int add_a_b(alpha,beta);
  friend int ab::add_a_b(alpha,beta);
};

class ab
{
 public:
  int add_a_b(alpha a, beta b)
  {
   return (a.data + b.data);
  };
};


int add_a_b(alpha a, beta b)
{
 return (a.data + b.data);
}

int
main()
{
 alpha      aa;
 beta       bb;

 cout << add_a_b(aa,bb) << endl;

 return (0);
}