[Boost-users] How can I find all the shortest path in a graph?

Hi all, Please excuse me if I post my question again, but I've spent all the night and the day before looking for a solution of the following problem: How to find *all* the possible shortest paths from a source vertex to a target vertex in a directed graph? I tried using depth_first_search and acting on visitors without any success. Please, could you help me? Thanks a lot in advance, Giulio