Dear All, I have upgraded to Boost 1.47.0 and I have spent a day on the following strange behavior that someone who knows Boost better may explain to me. Consider the source below. If I uncomment the line: //cout << ""; in line 39, then the program starts working, i.e., it outputs: 0x1 If I comment out line 39, then I get 0 There are no memory leaks. This kind of stuff gives me nightmares. Thanks for your help and sorry for the longish example. Thanks, -- Alex ----------------------------------------------------------------------- #include #include <iostream> using namespace boost; using namespace std; typedef adjacency_list, property > GraphT; class Graph : public GraphT { public: Graph(); public: typedef graph_traits<GraphT>::vertex_descriptor VertexType; typedef graph_traits<GraphT>::edge_descriptor EdgeType; public: ostream &put(ostream &) const; void setNetLabel(const EdgeType &, void *); void addNet(const VertexType &, const VertexType &, void *); private: property_map::type net_; }; Graph::Graph() { net_ = get(edge_name, *this); } void Graph::setNetLabel(const EdgeType &edge, void *label) { //cout << ""; net_[edge] = label; } void Graph::addNet(const VertexType &branch1, const VertexType &branch2, void *label) { EdgeType ei; bool inserted; tie(ei, inserted) = add_edge(branch1, branch2, *this); if (inserted) { setNetLabel(ei, label); } } ostream &Graph::put(ostream &out) const { graph_traits<GraphT>::edge_iterator ei, ei_end; for (tie(ei, ei_end) = edges(*this); ei != ei_end; ei++) { out << net_[*ei] << endl; } return out; } int main(int argc, char **argv) { Graph graph; Graph::VertexType v1 = add_vertex(graph); Graph::VertexType v2 = add_vertex(graph); graph.addNet(v1, v2, (void *)1); graph.put(cout); return EXIT_SUCCESS; } -----------------------------------------------------------------------