[Boost-users] [graph design] Advise needed - edge-to-edge passing cost

Dear all, I need to construct a graph with following requirements: 1. Edges should have a cost (trivial) 2. Vertices should have a cost (also trivial) 3. For each edge I need to define a costs of passing from this edge to any other adjacent edge (my problem is here!) It means that just vertex cost doesn't work - from one edge I can pass to several edges through the same vertex and I need separate cost for each way. I can't split edges and vertices to many, 'cause in my case it will drastically increase the data. Can anybody, please, make an advise how to implement the third rule? Thanks! Anton.