[boost] [BGL] Get properties from an out_edge_iterator efficiently

Hi, I have a graph implementation where get(tag, graph, out_edge_iterator) is much more efficient than get(tag, graph, edge_descriptor) which is probably not an usual case. Would it make sense for BGL to provide a default implementation of the former that dereferences the iterator and calls the latter? Graphs for which the former is more efficient could then specialize this function template. Cheers, Shaun