specialization of template friends

[W_Guthrie <pontusmelke at gmail dot com>]

Hi!
I have the following problem: I have written a Vector-class which looks
somewhat like this

template <int T> class Vector;

template <int T> double dot(const Vector<T>& u, const Vector<T>& v);
 
template<int T>
class Vector {
  Vector& operator+=(const Vector& v);
  ...
  friend double dot <>(const Vector<T>& u, const Vector<T>& v);
};

Now I want add a cross-product which only is a friend of Vector<3>, how do I
do this? I had one solution which looked like this:
template<int T>
class Vector {
  Vector& operator+=(const Vector& v);
  ...
  friend double dot <>(const Vector<T>& u, const Vector<T>& v);
  friend Vector<3> cross(const Vector<T>& u, const Vector<T>& v);
};

But this only works if I compile with -O3 or explicitly make the function to
an inline function? Does anyone know why this is? How should one do this?
Please let me know!

/Woodie
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