[bug] Template friends, namespace and instantiation

[Martin von Loewis]

> I can't get this to work. It seems that there is a problem when
> overloading a friend function which is inside a namespace.
[...]
>  namespace Test {
>   template <class T> void resizeG(Vector<T>&, int ) { cout << "A" ;}
> 
>   template <>
>   void resizeG(Vector<Point<float,3> >& , int ) { cout << "B" ; }
>  }
> 
>  using namespace Test ; 
>  template void resizeG<Point<float,3> >(Vector<Point<float,3> >& , int ) ;

You did not mention what compiler you are using. I get (with
egcs-2.92.21):

nameFriend.cc:13: explicit instantiation of `void resizeG<Point<float,3>>(class Test::Vector<Point<float,3> > &, int)' after
nameFriend.cc:8: explicit specialization here

which is different from the message you get.

I believe your code is wrong. First, you declare a specialization. You
cannot have an explicit instantiation after you had the specialization.

What's more, there is a requirement that these things happen in the
namespace where the template was declared. I'm not sure whether this
restriction applies to specializations only, or to instantiations as
well.

Regards,
Martin