Hi All, I have a graph-related problem that I thought was easy, but I do not seem to be able to find the right tools (algorithms, visitors) in the library to solve it. Maybe someone in the list can give me a hint. I represent airports and their air connections as a graph: * Each airport is a vertex. * There are geographical coordinates associated with each airport. * When there is at least one flight operating between airports A and B, this is represented as an edge. The task is to enumerate all paths between two given vertices U and V, in an efficient way naturally, given the following constraints: 1. The path cannot be composed of more than N edges 2. The path cannot contain a vertex "too far away from U and V", that is, there would be a predicate P that tells for a given vertex W the value P(U, V, W) that tells if vertex W is acceptable. So, I would need a tool that instructs the algorithm that when a certain vertex or an edge is encountered, an algorithm should be skipped on a given branch of the graph, but resume from the next branch. Is there a tool like that in Boost.Graph? Regards, &rzej;