matrix with custom elements

Hi,

I'm trying to create and then print a matrix where the elements are of
some custom type.  My sample code is shown at the bottom of my email.
I'm using the newest MTL v. 2.1.2-22 with GCC 3.4.4-2 on Linux 2.6.10.

Unfortunately, when I compile the code I get these errors:

/usr/local/include/mtl/utils.h: In function `void 
mtl::print_all_matrix(const Matrix&) [with Matrix = main()::Mat]':
sm.cc:29:   instantiated from here
/usr/local/include/mtl/utils.h:178: error: no match for 'operator<<' 
in 'std::cout << ((const 
mtl::matrix_implementation<mtl::gen_array2D<mtl::dense1D<polynomial, 
0> >, mtl::gen_rect_indexer<mtl::row_orien, 0, 0, size_t> 
 >*)(+A))->mtl::matrix_implementation<TwoDGen, IndexerGen>::operator() 
[with TwoDGen = mtl::gen_array2D<mtl::dense1D<polynomial, 0> >, 
IndexerGen = mtl::gen_rect_indexer<mtl::row_orien, 0, 0, size_t>](i, j)'

The code compiles if I don't use the print_all_matrix function.

I defined the << operator for the polynomial type, but it didn't help.
It would be great if someone could write me how to fix my problem.

Thanks for reading.


Best,
Irek

************************************************************************

#include <map>
#include <mtl/matrix.h>

using namespace mtl;
using namespace std;

typedef map<int, double> polynomial;

ostream &operator << (ostream &out, const polynomial &p)
{
   out << "(";
   for(polynomial::const_iterator i = p.begin(); i != p.end(); i++)
     out << "(" << i->first << ", " << i->second << ")";
   out << ")";

   return out;
}


int
main()
{
   typedef matrix<polynomial,
                  rectangle<>,
                  array< dense<> >,
                  row_major>::type Mat;

   Mat A(10, 10);
   print_all_matrix(A);

   return 0;
}
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