A DFSVisitor is needed by the depth_first_search and depth_first_visit methods of a graph. Besides the eventpoint of GraphVisitor, it provides an additional eventpoint start_vertex, which is called when a depth_first_search starts a new subtree of the depth first forest that is defined by the search.
Note that the discover_vertex event defined in the BGL DFSVisitor is not this is also defined in the common mixin GraphVisitor of DFSVisitor, DFSIterator, and BFSIterator.
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