incident
template <class Graph>
std::pair<typename graph_traits<Graph>::vertex_descriptor,
typename graph_traits<Graph>::vertex_descriptor>
incident(typename graph_traits<Graph>::edge_descriptor e, Graph& g)
This function takes and edge descriptor and returns the pair of
vertices that are incident to the edge. For directed graphs,
the first vertex is the source and the second vertex
is the target. This function is equivalent to the expression
std::make_pair(source(e, g), target(e, g)).
Example
edge_descriptor e;
vertex_descriptor u, v;
...
tie(u, v) = incident(e, g);
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