Sorry, I was mistaken. distance_heuristic::operator() does get called in my code. On 6/14/07, bringiton bringiton wrote:

I have a number of questions RE the astar-cities example.

Why is the distance_heuristic class needed. Is it used to find the weight for a test vertex to the goal vertex? I put a breakpoint in distance_heuristic::operator() and it never gets called. Is it ever used?

astar_search (... distance_heuristic ...)

Do I have to define my own or supply an astar_heuristic? Or can I pass a default heuristic?

astar_goal_visitor. Do I need to use this or can I pass a default default_astar_visitor? Are there other ways of reaching a goal without throwing an exception?

Thanks. Any advice appreciated