Allow for community labels to be of arbitrary types in modularity()

src/graph/community/graph_community.cc

@@ -88,7 +88,7 @@ double modularity(GraphInterface& g, boost::any weight, boost::any property)
 
     run_action<graph_tool::detail::never_directed>()
         (g, bind<void>(get_modularity(), _1, _2, _3, ref(modularity)),
-         edge_props_t(), vertex_scalar_properties())
+         edge_props_t(), vertex_properties())
         (weight, property);
     return modularity;
 }

src/graph/community/graph_community.hh

@@ -502,6 +502,7 @@ struct get_modularity
                     double& modularity) const
     {
         typedef typename property_traits<WeightMap>::key_type weight_key_t;
+        typedef typename property_traits<CommunityMap>::value_type s_val_t;
 
         modularity = 0.0;
         size_t E = 0;
@@ -514,10 +515,10 @@ struct get_modularity
                 W += get(weights, *e);
                 E++;
                 if (get(s, target(*e,g)) == get(s, source(*e,g)))
-                    modularity += 2*get(weights, weight_key_t(*e));
+                    modularity += 2 * get(weights, weight_key_t(*e));
             }
 
-        unordered_map<size_t, size_t> Ks;
+        unordered_map<s_val_t, size_t> Ks;
 
         typename graph_traits<Graph>::vertex_iterator v, v_end;
         for (tie(v,v_end) = vertices(g); v != v_end; ++v)