I have a Graph here: ********************************* //! value (i.e. voltage) of vertex struct value_t { typedef boost::vertex_property_tag kind; }; typedef boost::property<value_t, float> Value; /*! Defining the graph type 'digraph' * * The listS and vecS types are selectors that determine the data * structure used inside the adjacency_list (listS has faster time * complexity whereas vecS has lower space complexity). * * The directedS type specifies that the graph should be singly * directed and (versus undirected, or bidirectionalS). */ typedef boost::adjacency_list< boost::vecS, // EdgeList boost::vecS, // VertexList boost::directedS, Value, boost::property<boost::edge_weight_t, float> > Digraph; Digraph net; int N; //! Edge description typedef std::pair<int, int> Edge; //! Vertex description typedef Digraph::vertex_descriptor Vertex; //! Property map to access value (voltage) boost::property_map<Digraph, value_t>::type value; //! Structure for creating BFSvisitor struct rand_val : public boost::base_visitor<rand_val> { typedef boost::on_discover_vertex event_filter; template <class Vertex, class Digraph> void operator()(Vertex v, Digraph& G) { boost::put(value, v, normal_sampler()); } }; ********************************* and I try to implement it here (in the Poly.cpp file) ********************************* void Poly::propagate() { // The source vertex Vertex s = *(boost::vertices(net).first); // BFS needs to "color" the vertices. // using std::vector as exterior property storage. std::vector<boost::default_color_type> colors(N); // Breadth First Visit with appropiate visitor boost::breadth_first_visit( net, s, make_bfs_visitor(rand_val()), colors.begin() ); // i think either 'net' or 's' is broken (not correct models) } ********************************* when I compile I get the error: Poly.cpp: In member function 'void Poly::propagate()': Poly.cpp:61: error: no matching function for call to 'breadth_first_visit(boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS, boost::property<Poly::value_t, float, boost::no_property>, boost::property<boost::edge_weight_t, float, boost::no_property>, boost::no_property, boost::listS>&, size_t&, boost::bfs_visitor<Poly::rand_val>, __gnu_cxx::__normal_iterator<boost::default_color_type*, std::vector<boost::default_color_type, std::allocator<boost::default_color_type> > >)' make: *** [Poly.o] Error 1 which means my arguments don't match the function arguments . . . but I've been problem solving this for a while and I can't figure out which ones don't match? I'm thinking it must be my graph but I meet all of the stated requirements for the graph so I'm confused? Any help would be greatly appreciated. Here are the source files: http://svn.reducis.org/polyneuron/src/Poly.cpp http://svn.reducis.org/polyneuron/src/Poly.hpp - Trevor