Justin Viiret c7c90c7ab7 graph_undirected: adapt bidi graph to undirected
Introduces an adaptor (like the BGL's reverse_graph) that presents an
undirected view of a bidirectional graph.

Initially used in ng_calc_components.
2018-06-27 13:40:10 +08:00
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2015-10-20 09:13:35 +11:00