[Boost-users] Strange problem with boost/graph/subgraph.hpp

Dear list, I cannot compile a simple example using the subgraph implementation. I enclosed the code in the bottom of this email. It is quite short, but it is the whole code. It does not compile with errors from inside boost/graph/detail/adjacency_list.hpp about the impossiblity of making a reference to void. I read the subgraph documentation but I cannot understand why it does not work. Can anyone enlighten me? Your faithfully, Paolo The code: ------------------ >8 #include #include typedef boost::adjacency_list < boost::listS, boost::listS, boost::undirectedS

main_graph;

typedef boost::subgraph sub_graph; typedef boost::graph_traits::vertex_descriptor Bvertex; 8< ------------------