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/usr/include/boost/graph/maximum_adjacency_search.hpp
(15125B)
// //======================================================================= // Copyright 2012 Fernando Vilas // Copyright 2010 Daniel Trebbien // // 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) //======================================================================= // // The maximum adjacency search algorithm was originally part of the // Stoer-Wagner min cut implementation by Daniel Trebbien. It has been // broken out into its own file to be a public search algorithm, with // visitor concepts. #ifndef BOOST_GRAPH_MAXIMUM_ADJACENCY_SEARCH_H #define BOOST_GRAPH_MAXIMUM_ADJACENCY_SEARCH_H /** * This is an implementation of the maximum adjacency search on an * undirected graph. It allows a visitor object to perform some * operation on each vertex as that vertex is visited. * * The algorithm runs as follows: * * Initialize all nodes to be unvisited (reach count = 0) * and call vis.initialize_vertex * For i = number of nodes in graph downto 1 * Select the unvisited node with the highest reach count * The user provides the starting node to break the first tie, * but future ties are broken arbitrarily * Visit the node by calling vis.start_vertex * Increment the reach count for all unvisited neighbors * and call vis.examine_edge for each of these edges * Mark the node as visited and call vis.finish_vertex * */ #include <boost/concept_check.hpp> #include <boost/concept/assert.hpp> #include <boost/graph/buffer_concepts.hpp> #include <boost/graph/exception.hpp> #include <boost/graph/graph_concepts.hpp> #include <boost/graph/iteration_macros.hpp> #include <boost/graph/named_function_params.hpp> #include <boost/graph/visitors.hpp> #include <boost/tuple/tuple.hpp> #include <set> namespace boost { template < class Visitor, class Graph > struct MASVisitorConcept { void constraints() { boost::function_requires< boost::CopyConstructibleConcept< Visitor > >(); vis.initialize_vertex(u, g); vis.start_vertex(u, g); vis.examine_edge(e, g); vis.finish_vertex(u, g); } Visitor vis; Graph g; typename boost::graph_traits< Graph >::vertex_descriptor u; typename boost::graph_traits< Graph >::edge_descriptor e; }; template < class Visitors = null_visitor > class mas_visitor { public: mas_visitor() {} mas_visitor(Visitors vis) : m_vis(vis) {} template < class Vertex, class Graph > void initialize_vertex(Vertex u, Graph& g) { invoke_visitors(m_vis, u, g, ::boost::on_initialize_vertex()); } template < class Vertex, class Graph > void start_vertex(Vertex u, Graph& g) { invoke_visitors(m_vis, u, g, ::boost::on_start_vertex()); } template < class Edge, class Graph > void examine_edge(Edge e, Graph& g) { invoke_visitors(m_vis, e, g, ::boost::on_examine_edge()); } template < class Vertex, class Graph > void finish_vertex(Vertex u, Graph& g) { invoke_visitors(m_vis, u, g, ::boost::on_finish_vertex()); } BOOST_GRAPH_EVENT_STUB(on_initialize_vertex, mas) BOOST_GRAPH_EVENT_STUB(on_start_vertex, mas) BOOST_GRAPH_EVENT_STUB(on_examine_edge, mas) BOOST_GRAPH_EVENT_STUB(on_finish_vertex, mas) protected: Visitors m_vis; }; template < class Visitors > mas_visitor< Visitors > make_mas_visitor(Visitors vis) { return mas_visitor< Visitors >(vis); } typedef mas_visitor<> default_mas_visitor; namespace detail { template < class Graph, class WeightMap, class MASVisitor, class VertexAssignmentMap, class KeyedUpdatablePriorityQueue > void maximum_adjacency_search(const Graph& g, WeightMap weights, MASVisitor vis, const typename boost::graph_traits< Graph >::vertex_descriptor start, VertexAssignmentMap assignments, KeyedUpdatablePriorityQueue pq) { typedef typename boost::graph_traits< Graph >::vertex_descriptor vertex_descriptor; typedef typename boost::property_traits< WeightMap >::value_type weight_type; std::set< vertex_descriptor > assignedVertices; // initialize `assignments` (all vertices are initially // assigned to themselves) BGL_FORALL_VERTICES_T(v, g, Graph) { put(assignments, v, v); } typename KeyedUpdatablePriorityQueue::key_map keys = pq.keys(); // set number of visited neighbors for all vertices to 0 BGL_FORALL_VERTICES_T(v, g, Graph) { if (v == get(assignments, v)) { // foreach u \in V do put(keys, v, weight_type(0)); vis.initialize_vertex(v, g); pq.push(v); } } BOOST_ASSERT(pq.size() >= 2); // Give the starting vertex high priority put(keys, start, get(keys, start) + num_vertices(g) + 1); pq.update(start); // start traversing the graph // vertex_descriptor s, t; // weight_type w; while (!pq.empty()) { // while PQ \neq {} do const vertex_descriptor u = pq.top(); // u = extractmax(PQ) /* weight_type w = */ get(keys, u); vis.start_vertex(u, g); pq.pop(); // vis.start_vertex(u, g); BGL_FORALL_OUTEDGES_T(u, e, g, Graph) { // foreach (u, v) \in E do vis.examine_edge(e, g); const vertex_descriptor v = get(assignments, target(e, g)); if (pq.contains(v)) { // if v \in PQ then put(keys, v, get(keys, v) + get(weights, e)); // increasekey(PQ, v, wA(v) + w(u, v)) pq.update(v); } } typename std::set< vertex_descriptor >::const_iterator assignedVertexIt, assignedVertexEnd = assignedVertices.end(); for (assignedVertexIt = assignedVertices.begin(); assignedVertexIt != assignedVertexEnd; ++assignedVertexIt) { const vertex_descriptor uPrime = *assignedVertexIt; if (get(assignments, uPrime) == u) { BGL_FORALL_OUTEDGES_T(uPrime, e, g, Graph) { // foreach (u, v) \in E do vis.examine_edge(e, g); const vertex_descriptor v = get(assignments, target(e, g)); if (pq.contains(v)) { // if v \in PQ then put(keys, v, get(keys, v) + get(weights, e)); // increasekey(PQ, v, // wA(v) + w(u, v)) pq.update(v); } } } } vis.finish_vertex(u, g); } } } // end namespace detail template < class Graph, class WeightMap, class MASVisitor, class VertexAssignmentMap, class KeyedUpdatablePriorityQueue > void maximum_adjacency_search(const Graph& g, WeightMap weights, MASVisitor vis, const typename boost::graph_traits< Graph >::vertex_descriptor start, VertexAssignmentMap assignments, KeyedUpdatablePriorityQueue pq) { BOOST_CONCEPT_ASSERT((boost::IncidenceGraphConcept< Graph >)); BOOST_CONCEPT_ASSERT((boost::VertexListGraphConcept< Graph >)); typedef typename boost::graph_traits< Graph >::vertex_descriptor vertex_descriptor; typedef typename boost::graph_traits< Graph >::vertices_size_type vertices_size_type; typedef typename boost::graph_traits< Graph >::edge_descriptor edge_descriptor; BOOST_CONCEPT_ASSERT((boost::Convertible< typename boost::graph_traits< Graph >::directed_category, boost::undirected_tag >)); BOOST_CONCEPT_ASSERT( (boost::ReadablePropertyMapConcept< WeightMap, edge_descriptor >)); // typedef typename boost::property_traits<WeightMap>::value_type // weight_type; boost::function_requires< MASVisitorConcept< MASVisitor, Graph > >(); BOOST_CONCEPT_ASSERT( (boost::ReadWritePropertyMapConcept< VertexAssignmentMap, vertex_descriptor >)); BOOST_CONCEPT_ASSERT((boost::Convertible< vertex_descriptor, typename boost::property_traits< VertexAssignmentMap >::value_type >)); BOOST_CONCEPT_ASSERT( (boost::KeyedUpdatableQueueConcept< KeyedUpdatablePriorityQueue >)); vertices_size_type n = num_vertices(g); if (n < 2) throw boost::bad_graph( "the input graph must have at least two vertices."); else if (!pq.empty()) throw std::invalid_argument( "the max-priority queue must be empty initially."); detail::maximum_adjacency_search(g, weights, vis, start, assignments, pq); } namespace graph { namespace detail { template < typename WeightMap > struct mas_dispatch { typedef void result_type; template < typename Graph, typename ArgPack > static result_type apply(const Graph& g, // const bgl_named_params<P,T,R>& params, const ArgPack& params, WeightMap w) { using namespace boost::graph::keywords; typedef typename boost::graph_traits< Graph >::vertex_descriptor vertex_descriptor; typedef typename WeightMap::value_type weight_type; typedef boost::detail::make_priority_queue_from_arg_pack_gen< boost::graph::keywords::tag::max_priority_queue, weight_type, vertex_descriptor, std::greater< weight_type > > default_pq_gen_type; default_pq_gen_type pq_gen( choose_param(get_param(params, boost::distance_zero_t()), weight_type(0))); typename boost::result_of< default_pq_gen_type( const Graph&, const ArgPack&) >::type pq = pq_gen(g, params); boost::null_visitor null_vis; boost::mas_visitor< boost::null_visitor > default_visitor( null_vis); vertex_descriptor v = vertex_descriptor(); boost::detail::make_property_map_from_arg_pack_gen< boost::graph::keywords::tag::vertex_assignment_map, vertex_descriptor > map_gen(v); typename boost::detail::map_maker< Graph, ArgPack, boost::graph::keywords::tag::vertex_assignment_map, vertex_descriptor >::map_type default_map = map_gen(g, params); boost::maximum_adjacency_search(g, w, params[_visitor | default_visitor], params[_root_vertex | *vertices(g).first], params[_vertex_assignment_map | default_map], pq); } }; template <> struct mas_dispatch< boost::param_not_found > { typedef void result_type; template < typename Graph, typename ArgPack > static result_type apply( const Graph& g, const ArgPack& params, param_not_found) { using namespace boost::graph::keywords; typedef typename boost::graph_traits< Graph >::vertex_descriptor vertex_descriptor; // get edge_weight_t as the weight type typedef typename boost::property_map< Graph, edge_weight_t > WeightMap; typedef typename WeightMap::value_type weight_type; typedef boost::detail::make_priority_queue_from_arg_pack_gen< boost::graph::keywords::tag::max_priority_queue, weight_type, vertex_descriptor, std::greater< weight_type > > default_pq_gen_type; default_pq_gen_type pq_gen( choose_param(get_param(params, boost::distance_zero_t()), weight_type(0))); typename boost::result_of< default_pq_gen_type( const Graph&, const ArgPack&) >::type pq = pq_gen(g, params); boost::null_visitor null_vis; boost::mas_visitor< boost::null_visitor > default_visitor( null_vis); vertex_descriptor v = vertex_descriptor(); boost::detail::make_property_map_from_arg_pack_gen< boost::graph::keywords::tag::vertex_assignment_map, vertex_descriptor > map_gen(v); typename boost::detail::map_maker< Graph, ArgPack, boost::graph::keywords::tag::vertex_assignment_map, vertex_descriptor >::map_type default_map = map_gen(g, params); boost::maximum_adjacency_search(g, get(edge_weight, g), params[_visitor | default_visitor], params[_root_vertex | *vertices(g).first], params[_vertex_assignment_map | default_map], pq); } }; } // end namespace detail } // end namespace graph // Named parameter interface // BOOST_GRAPH_MAKE_OLD_STYLE_PARAMETER_FUNCTION(maximum_adjacency_search, 1) template < typename Graph, typename P, typename T, typename R > void maximum_adjacency_search( const Graph& g, const bgl_named_params< P, T, R >& params) { typedef bgl_named_params< P, T, R > params_type; BOOST_GRAPH_DECLARE_CONVERTED_PARAMETERS(params_type, params) // do the dispatch based on WeightMap typedef typename get_param_type< edge_weight_t, bgl_named_params< P, T, R > >::type W; graph::detail::mas_dispatch< W >::apply( g, arg_pack, get_param(params, edge_weight)); } namespace graph { namespace detail { template < typename Graph > struct maximum_adjacency_search_impl { typedef void result_type; template < typename ArgPack > void operator()(const Graph& g, const ArgPack& arg_pack) const { // call the function that does the dispatching typedef typename get_param_type< edge_weight_t, ArgPack >::type W; graph::detail::mas_dispatch< W >::apply( g, arg_pack, get_param(arg_pack, edge_weight)); } }; } // end namespace detail BOOST_GRAPH_MAKE_FORWARDING_FUNCTION(maximum_adjacency_search, 1, 5) } // end namespace graph } // end namespace boost #include <boost/graph/iteration_macros_undef.hpp> #endif // BOOST_GRAPH_MAXIMUM_ADJACENCY_SEARCH_H
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