FYI, I've just comitted a patch which adds the concept of 'null vertex' to BGL. If 'G' is a graph type, then
graph_traits<G>::null_vertex()
will return vertex_descriptor which does not refer to any vertex. Of course,
that value is never returned by add_vertex.
I found this concept usefull in some code of mine, and I recall somebody asked
for it long time ago.
- Volodya
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