boost.function as parameter of class template

From: richielee616 (richielee616_at_[hidden])
Date: 2002-02-18 07:21:23

I want to use boost.function object as a parameter of class template:

template< function1<void,int> F >
class foo
{
// ...
};

but VC6 tells me "F : template parameter can never be initialized"
why?