Hi All , 

I've been trying to use a custom structure for describing the various edge properties of a graph. I'm defining a graph as the following

struct edge_properties {
    int         capacity ; 
    double      weight ;
    typedef struct edge_properties_tag kind ;  // NOT SURE what this does ? 
};

typedef boost::adjacency_list<listS, vecS, bidirectionalS,
                              property<vertex_name_t, std::string>,
                              edge_properties > Graph;


This allows me to create a Graph instance g. I've been trying to retrieve the edge properties via a get call, but have not been able to do so. 

To retrieve the vertex properties doing the following works 

property_map<Graph, vertex_name_t>::type  v_names ; 
v_names = get(vertex_name,g) ; 

But on attempting to do something similar for retrieving the edge properties always fails with the following error message 

"test.cpp: 75: error: expected primary-expression before ',' token"

test.cpp

71: property_map<Graph, edge_properties>::type    epr;
72: property_map<Graph, vertex_name_t>::type  v_names ; 

74: v_names = get(vertex_name,g) ; 
75:  epr = get(edge_properties,g) ; 

I've tried various variants but seems to me i'm missing something fundamental in the way boost-graph keeps the edge_properties hidden. 
Any pointers will be useful. 

Thanks in advance