[Lemon-user] Graphs need first and next?

[Ben Strasser]

Hello,

I have been implementing a specialized graph structure and have 
implemented the interface as described in the documentation:
http://lemon.cs.elte.hu/pub/doc/latest/a00099.html
There first and next are not listed.

However lemon/dfs.h makes use of them and  lemon/concepts/digraph.h 
lists prototypes for those functions. Am I supposed to implement them or 
am I missing something?

Regards,
Ben Strasser