Hi, I'm having the above (end of email) error message when compiling my source using breadth_first_search in a labeled_graph, here are some of my definitions: I'm using boost 1.51.0. struct VertexProperty { string x; }; typedef boost::property<boost::edge_weight_t, double> IndexProperty; typedef boost::labeled_graph< boost::adjacency_list<boost::vecS, boost::setS, boost::bidirectionalS, VertexProperty, IndexProperty>, std::string> GraphT; I also created the following visitor: class recurrence_bfs_visitor : public boost::default_bfs_visitor { public: GraphT::vertex_descriptor check_node; recurrence_bfs_visitor(GraphT::vertex_descriptor node) : boost::default_bfs_visitor(), check_node(node) {} template < typename Vertex, typename Graph > void discover_vertex(Vertex u, const Graph & g) const { if( u == check_node ) throw std::runtime_error(""); } }; Then I call my functions in this way: auto v1 = g.vertex(e1); auto v2 = g.vertex(e2); recurrence_bfs_visitor vis(v2); boost::breadth_first_search(g.graph(), v1, boost::visitor(vis)); Where g is my GraphT and e1,e2 are strings that I receive as parameters. Here are the error message: 1>d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2499): error C2039: 'type' : is not a member of 'boost::property_value<PropertyList,Tag>' 1> with 1> [ 1> PropertyList=VertexProperty, 1> Tag=boost::vertex_index_t 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2576) : see reference to class template instantiation 'boost::adj_list_any_vertex_pa::bind_<Tag,Graph,Property>' being compiled 1> with 1> [ 1> Tag=boost::vertex_index_t, 1> Graph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> Property=VertexProperty 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2709) : see reference to class template instantiation 'boost::detail::adj_list_choose_vertex_pa<Tag,Graph,Property>' being compiled 1> with 1> [ 1> Tag=boost::vertex_index_t, 1> Graph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> Property=VertexProperty 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\properties.hpp(224) : see reference to class template instantiation 'boost::adj_list_vertex_property_selector::bind_<Graph,Property,Tag>' being compiled 1> with 1> [ 1> Graph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> Property=VertexProperty, 1> Tag=boost::vertex_index_t 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\properties.hpp(233) : see reference to class template instantiation 'boost::detail::vertex_property_map<Graph,PropertyTag>' being compiled 1> with 1> [ 1> Graph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> PropertyTag=boost::vertex_index_t 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\named_function_params.hpp(259) : see reference to class template instantiation 'boost::property_map<Graph,Property>' being compiled 1> with 1> [ 1> Graph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> Property=boost::vertex_index_t 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\mpl\eval_if.hpp(41) : see reference to class template instantiation 'boost::detail::const_type_as_type<T>' being compiled 1> with 1> [ 1> T=boost::property_map<boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>,boost::vertex_index_t> 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\mpl\eval_if.hpp(41) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled 1> with 1> [ 1> C=boost::mpl::true_, 1> F1=boost::detail::const_type_as_type<boost::property_map<boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>,boost::vertex_index_t>>, 1> F2=boost::property_map<boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>,boost::vertex_index_t> 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\named_function_params.hpp(274) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled 1> with 1> [ 1> C=boost::is_same<boost::param_not_found,boost::param_not_found>, 1> F1=boost::mpl::eval_if<boost::mpl::true_,boost::detail::const_type_as_type<boost::property_map<boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>,boost::vertex_index_t>>,boost::property_map<boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>,boost::vertex_index_t>>, 1> F2=boost::mpl::identity<boost::param_not_found> 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\breadth_first_search.hpp(316) : see reference to class template instantiation 'boost::detail::choose_impl_result<GraphIsConst,Graph,Param,Tag>' being compiled 1> with 1> [ 1> GraphIsConst=boost::mpl::true_, 1> Graph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> Param=boost::param_not_found, 1> Tag=boost::vertex_index_t 1> ] 1> d:\projects\cprojects\boost_1_51_0\boost\graph\breadth_first_search.hpp(340) : see reference to function template instantiation 'void boost::detail::bfs_dispatch<boost::param_not_found>::apply<VertexListGraph,recurrence_bfs_visitor,boost::graph_visitor_t,boost::no_property>(VertexListGraph &,void *,const boost::bgl_named_params<T,Tag,Base> &,boost::param_not_found)' being compiled 1> with 1> [ 1> VertexListGraph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> T=recurrence_bfs_visitor, 1> Tag=boost::graph_visitor_t, 1> Base=boost::no_property 1> ] 1> d:\novosprojetos\experiments\orcgraph\graphlib\graph.cpp(124) : see reference to function template instantiation 'void boost::breadth_first_search<boost::adjacency_list<OutEdgeListS,VertexListS,DirectedS,VertexProperty,EdgeProperty>,recurrence_bfs_visitor,boost::graph_visitor_t,boost::no_property>(const VertexListGraph &,void *,const boost::bgl_named_params<T,Tag,Base> &)' being compiled 1> with 1> [ 1> OutEdgeListS=boost::vecS, 1> VertexListS=boost::setS, 1> DirectedS=boost::bidirectionalS, 1> VertexProperty=VertexProperty, 1> EdgeProperty=IndexProperty, 1> VertexListGraph=boost::adjacency_list<boost::vecS,boost::setS,boost::bidirectionalS,VertexProperty,IndexProperty>, 1> T=recurrence_bfs_visitor, 1> Tag=boost::graph_visitor_t, 1> Base=boost::no_property 1> ] 1>d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2504): error C3203: 'type' : unspecialized class template can't be used as a template argument for template parameter 'ValueType', expected a real type 1>d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2504): error C2955: 'boost::type' : use of class template requires template argument list 1> d:\projects\cprojects\boost_1_51_0\boost\type.hpp(14) : see declaration of 'boost::type' 1> d:\projects\cprojects\boost_1_51_0\boost\type.hpp(14) : see declaration of 'boost::type' 1>d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2506): error C3203: 'type' : unspecialized class template can't be used as a template argument for template parameter 'ValueType', expected a real type 1>d:\projects\cprojects\boost_1_51_0\boost\graph\detail\adjacency_list.hpp(2506): error C2955: 'boost::type' : use of class template requires template argument list 1> d:\projects\cprojects\boost_1_51_0\boost\type.hpp(14) : see declaration of 'boost::type' 1> d:\projects\cprojects\boost_1_51_0\boost\type.hpp(14) : see declaration of 'boost::type' 1>d:\projects\cprojects\boost_1_51_0\boost\graph\breadth_first_search.hpp(316): error C2893: Failed to specialize function template 'boost::two_bit_color_map<IndexMap> boost::make_two_bit_color_map(size_t,const IndexMap &)' 1> With the following template arguments: 1> 'boost::adj_list_vertex_property_map' -- Julio Cezar Novais Raffaine Sistemas de Engenharia, Odebrecht SA São Paulo, SP http://elloxas.blogspot.com/