🚀 go-pugleaf

I have the following compiler message::

/usr/local/gnu/g++ -O -I ../Include/ -target sun4 -c test.C
test.C: In function `int  main ()':
test.C:68: type conversion required for type `List<Set>'
*** Error code 1

Is this a compiler bug or am I doing something wrong?? The code is...
include "list.h"
#include "set.h"
#include <iostream.h>

#include "../Utilities/list.C"

ostream& operator <<(ostream& os, List<Set>& list)
{
  for(int i=0; i < list.size(); i++)
  {
    os << "< ";
    for(int j = 0; j < list[i].maxSize(); j++)
    {
      if(list[i] == j)
      {
        os << " " << (char)('A'+j) << " ";
      }
      else
      {
        os << "~" << (char)('A'+j) << " ";
      }
    }
    os << ">";

    os <<"\n";
  }
  return(os);
}

int power(int number)
{
  int value = 1;

  for(int i =0; i < number; i++)
  {
    value *= 2;
  }
  return(value);
}

main()
{
  int size;

  cout << "Enter size:" << flush;
  cin >> size;

  int number = power(size);
  Set base(size);

  int index = 0;
  List<Set> list;

  list.add(base);

  for(int i=1; i < number; i++)
  {
    while(base == index)
    {
      base -= index;
      index++;
    }
    base += index;
    cout << base;
    index = 0;
    list.add(base);
  }
  cout << list;   // line # 68....
}

As you can see I have a List<Set> output operator so why does it want to cast?


Mark.