From: "Lars Hansen" <lars DOT o DOT hansen AT gmx DOT de>
Newsgroups: comp.os.msdos.djgpp
References: <393176dd AT news DOT ivm DOT net>
Subject: Re: template friend
Date: Wed, 31 May 2000 21:36:40 +0200
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To: djgpp AT delorie DOT com
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' template<class T, class U> friend class A; '
declares all  'A' s  as a friend of the object this expression is used in.

' friend class A<T,U>; '
declares specifically A<T,U> as a friend.

That should be ANSI-C++  and  DJGPP 2.03 understands that.

But the answer to your problem is different: a small forward-declaration is
necessary:
' template<class TT> class Two; '

That's what the debugger is saying: 'c' is undeclared, meaning its type is
unknown (so far).