Hello, I want to create an iterator_property_map to iterate over the edges, but I cannot declare the following: typedef property_map<Graph, edge_index_t>::const_type EdgeIndexMap; The compilation gives me an error. I am using an adjacency list with vertex and edge properties. I can use a vertex_index_t, so I assumed that I could use the equivalent for edges. But I don't understand why I can't. This is my adjacency list: typedef boost::adjacency_list<vecS, distributedS<mpi_process_group, vecS>, bidirectionalS, property<vertex_index_t, int>, EdgeProperties> Graph; Have anyone deal with something similar? Thank you -- View this message in context: http://boost.2283326.n4.nabble.com/graph-BGL-Why-can-not-I-use-edge-index-t-... Sent from the Boost - Users mailing list archive at Nabble.com.