Is it possible to make friend of a class, all possible variants of a class-template?
Just to clarify, for example, something like this:
class A
{ friend template B; } // syntactic error yeah
So any B<X>
variant could manipulate any protected attribute of A
.
A
is an small and simple class with a lot of friends who manipulate its attributes. Just one of then need to be a template. I know that I can do this:
template <class T>
class A
{ friend class B<T>; }
But so I would have to change my code in all the other friends and I would like to avoid it.