friend template class

[Nathan Myers]

Christian Kueblbeck wrote:
> 
> The following piece of code does not compile:
> 
> template <class T> class Test
> {
>      friend class Friend<T>;
> };
> 
> g++ 2.7.1 compiles without warning (as well as MS Visual C++), but egcs
> says:
> 
> parse error before `<'
> 
> How else should I declare friend template class?

You need to declare Friend as a template outside Test
before you declare an instance of it as a friend inside
Test.  This compiles on egcs:

  template <class T> struct A;
  template <class T> struct B { friend struct A<T>; };

Nathan Myers
ncm@cantrip.org