[Boost-users] [graph] filtered graph and num_vertices

Hi All, I have a graph, and I use a filter like this. struct FilteredGraph : public boost::filtered_graph { FilteredGraph(SomeGraph g) : boost::filtered_graph(g, SomeFilter(g)) {} }; I want to use in this function. template <class Graph>void some_graph_function(const Graph& g) { const size_t vertex_num = boost::num_vertices(g); //... } Like this: FilteredGraph fg(g) some_graph_function(fg); And I get:

error: no matching function for call to 'num_vertices(const FilteredGraph&)' const size_t vertex_num = boost::num_vertices(g); ^

From the boost 1.55 documentation:

The num_vertices http://www.boost.org/doc/libs/1_55_0/libs/graph/doc/filtered_graph.html#num_... and num_edges http://www.boost.org/doc/libs/1_55_0/libs/graph/doc/filtered_graph.html#num_... functions do not filter before returning results, so they return the number of vertices or edges in the underlying graph, unfiltered [2] http://www.boost.org/doc/libs/1_55_0/libs/graph/doc/filtered_graph.html#2. So it should work.

What am I missing? Regards, Miklós