Hi, The example code for extending dijkstra via gives compilation errors. Attached below is the snippet code and the error messages using gcc-4.3.3 and boost_138_0. typedef boost::adjacency_list<vecS, vecS, bidirectionalS > graphImpl_t; //----taken for doc--- template <class PredecessorMap> class record_predecessors : public dijkstra_visitor<> { public: record_predecessors(PredecessorMap p) : m_predecessor(p) { } template <class Edge, class Graph> void edge_relaxed(Edge e, Graph& g) { // set the parent of the target(e) to source(e) put(m_predecessor, target(e, g), source(e, g)); } protected: PredecessorMap m_predecessor; }; template <class PredecessorMap> record_predecessors<PredecessorMap> //error: expected constructor, destructor, or type conversion before ‘<’ token make_predecessor_recorder(PredecessorMap p) { return record_predecessors<PredecessorMap>(p); } ///---end doc-------------- ..... ... vector<vertex_t> p(num_vertices(gg)); dijkstra_shortest_paths(gg, src, predecessor_map(preds).weight_map(weights).distance_map(dists).visitor(make_predecessor_recorder(&p[0]))); Thanks in advance. -sandeep