Hi Sven, I recommend throwing an exception from inside a visitor and catching it outside the call to dijkstra. Cheers, Jeremy On Apr 3, 2004, at 3:36 PM, Sven de Vries wrote:

Hi,

in a given graph I want to determine whether between one (!) pair (u,v) of vertices there exists an u-v-path of length at most some given threshold and that path.

I use dijkstra_shortest_paths(g,u,

but to accelerate matters I would like to stop the computation as soon as the key of v becomes smaller than the threshold or v turns black.

I couldn't find a hook of the dijkstra algorithm that could be used to achieve this. Do I really have to change the implementation of the dijkstra algorithm for this, or is there a better way?

Thanks sven

Jeremy Siek http://www.osl.iu.edu/~jsiek Ph.D. Student, Indiana University Bloomington Graduating in August 2004 and looking for work C++ Booster (http://www.boost.org) _______________________________________________