Hi, when using graph-tool from C++, you can use one or more PropertyMaps. In the documentation they are always given as an extra argument. Since graph-tool has internal PropertyMaps, is it possible to extract internal PropertyMaps out of the GraphInterface object?
In pseudo code (like in the documentation):
```
void kcore_bind(GraphInterface& gi)
{
// Vertex property map of type int32_t
typedef typename vprop_map_t<int32_t>::type vprop_t;
vprop_t c =
boost::any_cast<vprop_t>(gi.get_internal_vertex_property_map("foo"));
gt_dispatch<>()
([&](auto& g){ kcore_decomposition(g, c.get_unchecked()); },
all_graph_views()) (gi.get_graph_view());
}
```
Is there a way to simulate the `get_internal_vertex_property_map`
method?
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