// //======================================================================= // Copyright 1997, 1998, 1999, 2000 University of Notre Dame. // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) //======================================================================= // #ifndef BOOST_GRAPH_UNDIRECTED_DFS_HPP #define BOOST_GRAPH_UNDIRECTED_DFS_HPP #include #include #include namespace boost { namespace detail { // Define BOOST_RECURSIVE_DFS to use older, recursive version. // It is retained for a while in order to perform performance // comparison. #ifndef BOOST_RECURSIVE_DFS template < typename IncidenceGraph, typename DFSVisitor, typename VertexColorMap, typename EdgeColorMap > void undir_dfv_impl(const IncidenceGraph& g, typename graph_traits< IncidenceGraph >::vertex_descriptor u, DFSVisitor& vis, VertexColorMap vertex_color, EdgeColorMap edge_color) { BOOST_CONCEPT_ASSERT((IncidenceGraphConcept< IncidenceGraph >)); BOOST_CONCEPT_ASSERT((DFSVisitorConcept< DFSVisitor, IncidenceGraph >)); typedef typename graph_traits< IncidenceGraph >::vertex_descriptor Vertex; typedef typename graph_traits< IncidenceGraph >::edge_descriptor Edge; BOOST_CONCEPT_ASSERT( (ReadWritePropertyMapConcept< VertexColorMap, Vertex >)); BOOST_CONCEPT_ASSERT( (ReadWritePropertyMapConcept< EdgeColorMap, Edge >)); typedef typename property_traits< VertexColorMap >::value_type ColorValue; typedef typename property_traits< EdgeColorMap >::value_type EColorValue; BOOST_CONCEPT_ASSERT((ColorValueConcept< ColorValue >)); BOOST_CONCEPT_ASSERT((ColorValueConcept< EColorValue >)); typedef color_traits< ColorValue > Color; typedef color_traits< EColorValue > EColor; typedef typename graph_traits< IncidenceGraph >::out_edge_iterator Iter; typedef std::pair< Vertex, std::pair< boost::optional< Edge >, std::pair< Iter, Iter > > > VertexInfo; std::vector< VertexInfo > stack; put(vertex_color, u, Color::gray()); vis.discover_vertex(u, g); stack.push_back(std::make_pair( u, std::make_pair(boost::optional< Edge >(), out_edges(u, g)))); while (!stack.empty()) { VertexInfo& back = stack.back(); u = back.first; boost::optional< Edge > src_e = back.second.first; Iter ei = back.second.second.first, ei_end = back.second.second.second; stack.pop_back(); while (ei != ei_end) { Vertex v = target(*ei, g); vis.examine_edge(*ei, g); ColorValue v_color = get(vertex_color, v); EColorValue uv_color = get(edge_color, *ei); put(edge_color, *ei, EColor::black()); if (v_color == Color::white()) { vis.tree_edge(*ei, g); src_e = *ei; stack.push_back(std::make_pair(u, std::make_pair(src_e, std::make_pair(++ei, ei_end)))); u = v; put(vertex_color, u, Color::gray()); vis.discover_vertex(u, g); boost::tie(ei, ei_end) = out_edges(u, g); } else if (v_color == Color::gray()) { if (uv_color == EColor::white()) vis.back_edge(*ei, g); call_finish_edge(vis, *ei, g); ++ei; } else { // if (v_color == Color::black()) call_finish_edge(vis, *ei, g); ++ei; } } put(vertex_color, u, Color::black()); vis.finish_vertex(u, g); if (src_e) call_finish_edge(vis, src_e.get(), g); } } #else // BOOST_RECURSIVE_DFS template < typename IncidenceGraph, typename DFSVisitor, typename VertexColorMap, typename EdgeColorMap > void undir_dfv_impl(const IncidenceGraph& g, typename graph_traits< IncidenceGraph >::vertex_descriptor u, DFSVisitor& vis, // pass-by-reference here, important! VertexColorMap vertex_color, EdgeColorMap edge_color) { BOOST_CONCEPT_ASSERT((IncidenceGraphConcept< IncidenceGraph >)); BOOST_CONCEPT_ASSERT((DFSVisitorConcept< DFSVisitor, IncidenceGraph >)); typedef typename graph_traits< IncidenceGraph >::vertex_descriptor Vertex; typedef typename graph_traits< IncidenceGraph >::edge_descriptor Edge; BOOST_CONCEPT_ASSERT( (ReadWritePropertyMapConcept< VertexColorMap, Vertex >)); BOOST_CONCEPT_ASSERT( (ReadWritePropertyMapConcept< EdgeColorMap, Edge >)); typedef typename property_traits< VertexColorMap >::value_type ColorValue; typedef typename property_traits< EdgeColorMap >::value_type EColorValue; BOOST_CONCEPT_ASSERT((ColorValueConcept< ColorValue >)); BOOST_CONCEPT_ASSERT((ColorValueConcept< EColorValue >)); typedef color_traits< ColorValue > Color; typedef color_traits< EColorValue > EColor; typename graph_traits< IncidenceGraph >::out_edge_iterator ei, ei_end; put(vertex_color, u, Color::gray()); vis.discover_vertex(u, g); for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) { Vertex v = target(*ei, g); vis.examine_edge(*ei, g); ColorValue v_color = get(vertex_color, v); EColorValue uv_color = get(edge_color, *ei); put(edge_color, *ei, EColor::black()); if (v_color == Color::white()) { vis.tree_edge(*ei, g); undir_dfv_impl(g, v, vis, vertex_color, edge_color); } else if (v_color == Color::gray() && uv_color == EColor::white()) vis.back_edge(*ei, g); call_finish_edge(vis, *ei, g); } put(vertex_color, u, Color::black()); vis.finish_vertex(u, g); } #endif // ! BOOST_RECURSIVE_DFS } // namespace detail template < typename Graph, typename DFSVisitor, typename VertexColorMap, typename EdgeColorMap, typename Vertex > void undirected_dfs(const Graph& g, DFSVisitor vis, VertexColorMap vertex_color, EdgeColorMap edge_color, Vertex start_vertex) { BOOST_CONCEPT_ASSERT((DFSVisitorConcept< DFSVisitor, Graph >)); BOOST_CONCEPT_ASSERT((EdgeListGraphConcept< Graph >)); typedef typename property_traits< VertexColorMap >::value_type ColorValue; typedef color_traits< ColorValue > Color; typename graph_traits< Graph >::vertex_iterator ui, ui_end; for (boost::tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) { put(vertex_color, *ui, Color::white()); vis.initialize_vertex(*ui, g); } typename graph_traits< Graph >::edge_iterator ei, ei_end; for (boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) put(edge_color, *ei, Color::white()); if (start_vertex != *vertices(g).first) { vis.start_vertex(start_vertex, g); detail::undir_dfv_impl(g, start_vertex, vis, vertex_color, edge_color); } for (boost::tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) { ColorValue u_color = get(vertex_color, *ui); if (u_color == Color::white()) { vis.start_vertex(*ui, g); detail::undir_dfv_impl(g, *ui, vis, vertex_color, edge_color); } } } template < typename Graph, typename DFSVisitor, typename VertexColorMap, typename EdgeColorMap > void undirected_dfs(const Graph& g, DFSVisitor vis, VertexColorMap vertex_color, EdgeColorMap edge_color) { undirected_dfs(g, vis, vertex_color, edge_color, *vertices(g).first); } namespace detail { template < typename VertexColorMap > struct udfs_dispatch { template < typename Graph, typename Vertex, typename DFSVisitor, typename EdgeColorMap, typename P, typename T, typename R > static void apply(const Graph& g, DFSVisitor vis, Vertex start_vertex, const bgl_named_params< P, T, R >&, EdgeColorMap edge_color, VertexColorMap vertex_color) { undirected_dfs(g, vis, vertex_color, edge_color, start_vertex); } }; template <> struct udfs_dispatch< param_not_found > { template < typename Graph, typename Vertex, typename DFSVisitor, typename EdgeColorMap, typename P, typename T, typename R > static void apply(const Graph& g, DFSVisitor vis, Vertex start_vertex, const bgl_named_params< P, T, R >& params, EdgeColorMap edge_color, param_not_found) { std::vector< default_color_type > color_vec(num_vertices(g)); default_color_type c = white_color; // avoid warning about un-init undirected_dfs(g, vis, make_iterator_property_map(color_vec.begin(), choose_const_pmap( get_param(params, vertex_index), g, vertex_index), c), edge_color, start_vertex); } }; } // namespace detail // Named Parameter Variant template < typename Graph, typename P, typename T, typename R > void undirected_dfs(const Graph& g, const bgl_named_params< P, T, R >& params) { typedef typename get_param_type< vertex_color_t, bgl_named_params< P, T, R > >::type C; detail::udfs_dispatch< C >::apply(g, choose_param( get_param(params, graph_visitor), make_dfs_visitor(null_visitor())), choose_param(get_param(params, root_vertex_t()), *vertices(g).first), params, get_param(params, edge_color), get_param(params, vertex_color)); } template < typename IncidenceGraph, typename DFSVisitor, typename VertexColorMap, typename EdgeColorMap > void undirected_depth_first_visit(const IncidenceGraph& g, typename graph_traits< IncidenceGraph >::vertex_descriptor u, DFSVisitor vis, VertexColorMap vertex_color, EdgeColorMap edge_color) { detail::undir_dfv_impl(g, u, vis, vertex_color, edge_color); } } // namespace boost #endif