struct FilteredGraph : public boost::filtered_graph<SomeGraph, SomeFilter > {

    FilteredGraph(SomeGraph g) : boost::filtered_graph<SomeGraph, SomeFilter>(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 and num_edges functions do not filter

> before returning results, so they return the number of vertices or
> edges in the underlying graph, unfiltered [2].

So it should work.

What am I missing?