Question about template friends

[Damian Menscher <menscher@uiuc.edu>]

First, let me point out that I realize this is answered in the FAQ, but I
still can't figure it out.

I'm attempting to overload operator<< for a template class I've written.
Following the faq, I've done the following:

--- from quark.h ------------------
// Forward declaration of class
template <class NUMBER>
class Quark;
template <class NUMBER>
ostream& operator<< (ostream&, const Quark<NUMBER>);


template<class NUMBER=Real>                     // default to Real if no
type is given
class Quark {
.
.
.

//IO Functions
friend ostream& operator<< <> (ostream&, const Quark<NUMBER>&);

};
---------------------------------------

and then tried to instantiate it as follows:

--------from quark.C ------------------
template<class NUMBER>
ostream& operator<<(ostream& os, const Quark<NUMBER>& quark) {
   os << "( ";
   for (int counter=0; counter<NUMSPINS; counter++)
      os << quark.data[counter] << " ";
   os << ")" << flush;
   return os;
}

//////////////////////////
// Template Instantiations
template class Quark<float>;
template class Quark<double>;
template ostream& operator<< (ostream&, const Quark<float>&);
template ostream& operator<< (ostream&, const Quark<double>&);
------------------------------------------

When compiling, I get the error message:
quark.h:46: template-id `operator <<<Real>' for `operator <<(ostream &,
const Quark<float> &)' does not match any template declaration

Could someone please tell me what's going on here, or point me to the
proper place to ask this question?

TIA,

Damian Menscher
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