template <class DistMap>
class djk_max_visitor:
    public boost::dijkstra_visitor<null_visitor>
{
public:
    djk_max_visitor(DistMap dist_map,
                    typename property_traits<DistMap>::value_type max_dist, size_t target)
        : _dist_map(dist_map), _max_dist(max_dist), _target(target) {}


    template <class Graph>
    void examine_vertex(typename graph_traits<Graph>::vertex_descriptor u,
                        Graph&)
    {
        if (_dist_map[u] > _max_dist)
            throw stop_search();

        std::size_t search = _target.find(u);
        if (search != _target.end())
        {
          _target.erase(*search)
          if _target.empty()
            throw stop_search();
        }
    }


private:
    DistMap _dist_map;
    typename property_traits<DistMap>::value_type _max_dist;
    std::unordered_set<std::size_t> _target;
};