[graph-tool] Extract C++ edge from graph_tool.libgraph_tool_core.Edge

Hi, I'm using graph-tool from both Python and C++. Normally, all works well with the dispatch function. But now I came to a situation, where I get an edge object (graph_tool.libgraph_tool_core.Edge) and want to use this from C++. Is there a way to do this? This is the same question as: I have a function `void do_stuff(PyObject* foo)` where `foo` is a `graph_tool.libgraph_tool_core.Edge`. Can I extract the boost::detail::adj_edge_descriptor somehow (or whatever is the correct edge type)? Kind regards Gerion