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From: Jens Müller (jens.mueller_at_[hidden])
Date: 2007-03-09 08:41:17
http://www.boost.org/libs/graph/doc/Graph.html mentions it:
Valid Expressions
boost::graph_traits<G>::null_vertex()
Returns a special boost::graph_traits<G>::vertex_descriptor object
which does not refer to any vertex of graph object which type is G.
http://www.boost.org/libs/graph/doc/graph_concepts.html does not ...
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