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Templates; making a class a friend

Posted on 2000-03-30
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Last Modified: 2010-04-10
I'm almost there (after getting the answer to my more critical error earlier)....

I have two template classes. I want to make one a friend of the other so it can see the private member variables.

ListNode.h
-----------
template <class T>
class ListNode {
  friend class List<T>;
}

List.h
---------
#include "ListNode.h"

template <class T>
class List {

}

What happens is I get a "syntax error : '<' " on the line

friend class List<T>;

I've tried including "List.h" in this file, no change.

So is this possible? If so, how? What am I screwing up?

Thanks!
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Question by:gunn
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3 Comments
 
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Accepted Solution

by:
arikka earned 200 total points
ID: 2669928
Declaration of class List should be prior ListNode, so in ListNode.h
write forward declaration:

template <class T> class List;  

template <class T> class ListNode
{
  friend class List<T>;
}
0
 

Author Comment

by:gunn
ID: 2670049
I could have swore I tried that!

Actually, what I tried was:

template <class T> class List<T>;

and so was getting an error on the '<'. Guess I should have tried that one last combination ;)

I'm all set now!
0
 

Author Comment

by:gunn
ID: 2670050
I could have swore I tried that!

Actually, what I tried was:

template <class T> class List<T>;

and so was getting an error on the '<'. Guess I should have tried that one last combination ;)

I'm all set now!
0

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