[pgrouting-users] directed graphs?

[Stephen Woodbridge]

How should the directed boolean be used?

For example does function assign_vertex_id() build a directed or 
undirected graph?

Does using a reverse_cost column imply a directed graph?

I assume that if I use assign_vertex_id() to build my graphs, which 
appears to build undirected graphs, that I will set directed to false 
and that this option would only be used if I wrote my own function the 
specifically build directed graph.

-Steve