Please see the code below.

class my_visitor: public default_dfs_visitor {
public:
my_visitor(){}
void finish_vertex(Vertex u, const Graph & g);
vector<Vertex> getFinishingOrder(void){return finishingOrder;}
//private:
vector<Vertex> finishingOrder;//stores the vertices in the finishing
order

};

template<typename Vertex, typename Graph>
void my_visitor::finish_vertex(Vertex u, const Graph & g){
finishingOrder.push_back(u);

}

main.cpp has the following:
my_visitor vis;
depth_first_search(g, visitor(vis));//to get the finishing order on
vertices
cout << "size of fin vector = " << vis.finishingOrder.size() << endl;

My problem: size of the finishingOrder vector is zero outside the
my_visitor::finish_vertex method. I checked its size inside the
my_visitor::finish_vertex method and its value is increasing...

Does I miss something in the understanding of the visitor concept?

Thanks
suresh