[Lemon-user] Inheriting from Lemon classes

[Marco Blanco]

Hello,

I am implementing a shortest path algorithm where the arc costs are 
unknown a priori and need to be computed on the fly. For that reason, I 
decided to try to define a class MyDijkstra, which inherits from 
lemon::Dijkstra<ListDigraph>. My plan was to override the member 
function processNextNode(), but then I realized that the Dijkstra class 
has some private members that I would need and don't have access to, 
such as the underlying digraph object. I temporarily solved the issue by 
replacing all "private" labels with "protected" in "dijkstra.h", but I 
don't like messing with the Lemon source code.

Is inheriting from Lemon classes discouraged in general? Can you think 
of an alternative way in which I could make use of the existing 
structure without having to copy-paste the entire class definition only 
to change two lines?

Thank you,
Marco
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