418 lines
16 KiB
C++
418 lines
16 KiB
C++
// Copyright (c) Jeremy Siek 2001
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// Copyright (c) Douglas Gregor 2004
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// NOTE: this final is generated by libs/graph/doc/biconnected_components.w
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#ifndef BOOST_GRAPH_BICONNECTED_COMPONENTS_HPP
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#define BOOST_GRAPH_BICONNECTED_COMPONENTS_HPP
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#include <stack>
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#include <vector>
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#include <algorithm> // for std::min and std::max
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#include <boost/config.hpp>
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#include <boost/limits.hpp>
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#include <boost/graph/graph_traits.hpp>
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#include <boost/graph/graph_concepts.hpp>
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#include <boost/property_map/property_map.hpp>
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#include <boost/graph/depth_first_search.hpp>
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#include <boost/graph/graph_utility.hpp>
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#include <boost/concept/assert.hpp>
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#include <boost/assert.hpp>
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namespace boost
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{
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namespace detail
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{
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template<typename ComponentMap, typename DiscoverTimeMap,
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typename LowPointMap, typename PredecessorMap,
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typename OutputIterator, typename Stack,
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typename ArticulationVector, typename IndexMap,
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typename DFSVisitor>
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struct biconnected_components_visitor : public dfs_visitor<>
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{
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biconnected_components_visitor
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(ComponentMap comp, std::size_t& c,
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std::size_t& children_of_root, DiscoverTimeMap dtm,
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std::size_t& dfs_time, LowPointMap lowpt, PredecessorMap pred,
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OutputIterator out, Stack& S,
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ArticulationVector& is_articulation_point, IndexMap index_map,
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DFSVisitor vis)
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: comp(comp), c(c), children_of_root(children_of_root),
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dtm(dtm), dfs_time(dfs_time), lowpt(lowpt),
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pred(pred), out(out), S(S),
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is_articulation_point(is_articulation_point),
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index_map(index_map), vis(vis) { }
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template <typename Vertex, typename Graph>
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void initialize_vertex(const Vertex& u, Graph& g)
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{
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put(pred, u, u);
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vis.initialize_vertex(u, g);
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}
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template <typename Vertex, typename Graph>
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void start_vertex(const Vertex& u, Graph& g)
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{
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children_of_root = 0;
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vis.start_vertex(u, g);
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}
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template <typename Vertex, typename Graph>
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void discover_vertex(const Vertex& u, Graph& g)
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{
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put(dtm, u, ++dfs_time);
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put(lowpt, u, get(dtm, u));
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vis.discover_vertex(u, g);
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}
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template <typename Edge, typename Graph>
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void examine_edge(const Edge& e, Graph& g)
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{
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vis.examine_edge(e, g);
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}
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template <typename Edge, typename Graph>
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void tree_edge(const Edge& e, Graph& g)
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{
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typename boost::graph_traits<Graph>::vertex_descriptor src = source(e, g);
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typename boost::graph_traits<Graph>::vertex_descriptor tgt = target(e, g);
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S.push(e);
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put(pred, tgt, src);
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if ( get(pred, src) == src ) {
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++children_of_root;
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}
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vis.tree_edge(e, g);
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}
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template <typename Edge, typename Graph>
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void back_edge(const Edge& e, Graph& g)
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{
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BOOST_USING_STD_MIN();
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typename boost::graph_traits<Graph>::vertex_descriptor src = source(e, g);
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typename boost::graph_traits<Graph>::vertex_descriptor tgt = target(e, g);
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if ( tgt != get(pred, src) ) {
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S.push(e);
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put(lowpt, src,
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min BOOST_PREVENT_MACRO_SUBSTITUTION(get(lowpt, src),
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get(dtm, tgt)));
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}
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vis.back_edge(e, g);
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}
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template <typename Edge, typename Graph>
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void forward_or_cross_edge(const Edge& e, Graph& g)
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{
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vis.forward_or_cross_edge(e, g);
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}
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template <typename Vertex, typename Graph>
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void finish_vertex(const Vertex& u, Graph& g)
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{
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BOOST_USING_STD_MIN();
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Vertex parent = get(pred, u);
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if (parent == u) { // Root of tree is special
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is_articulation_point[get(index_map, u)] = (children_of_root > 1);
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} else {
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put(lowpt, parent,
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min BOOST_PREVENT_MACRO_SUBSTITUTION(get(lowpt, parent),
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get(lowpt, u)));
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if ( get(lowpt, u) >= get(dtm, parent) ) {
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is_articulation_point[get(index_map, parent)] = true;
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while ( get(dtm, source(S.top(), g)) >= get(dtm, u) ) {
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put(comp, S.top(), c);
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S.pop();
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}
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BOOST_ASSERT (source(S.top(), g) == parent);
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BOOST_ASSERT (target(S.top(), g) == u);
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put(comp, S.top(), c);
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S.pop();
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++c;
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}
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}
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if ( is_articulation_point[get(index_map, u)] ) {
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*out++ = u;
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}
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vis.finish_vertex(u, g);
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}
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ComponentMap comp;
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std::size_t& c;
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std::size_t& children_of_root;
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DiscoverTimeMap dtm;
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std::size_t& dfs_time;
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LowPointMap lowpt;
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PredecessorMap pred;
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OutputIterator out;
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Stack& S;
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ArticulationVector& is_articulation_point;
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IndexMap index_map;
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DFSVisitor vis;
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};
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, typename DiscoverTimeMap, typename LowPointMap,
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typename PredecessorMap, typename DFSVisitor>
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std::pair<std::size_t, OutputIterator>
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biconnected_components_impl(const Graph & g, ComponentMap comp,
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OutputIterator out, VertexIndexMap index_map, DiscoverTimeMap dtm,
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LowPointMap lowpt, PredecessorMap pred, DFSVisitor dfs_vis)
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{
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typedef typename graph_traits<Graph>::vertex_descriptor vertex_t;
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typedef typename graph_traits<Graph>::edge_descriptor edge_t;
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BOOST_CONCEPT_ASSERT(( VertexListGraphConcept<Graph> ));
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BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept<Graph> ));
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BOOST_CONCEPT_ASSERT(( WritablePropertyMapConcept<ComponentMap, edge_t> ));
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BOOST_CONCEPT_ASSERT(( ReadWritePropertyMapConcept<DiscoverTimeMap,
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vertex_t> ));
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BOOST_CONCEPT_ASSERT(( ReadWritePropertyMapConcept<LowPointMap, vertex_t > ));
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BOOST_CONCEPT_ASSERT(( ReadWritePropertyMapConcept<PredecessorMap,
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vertex_t> ));
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std::size_t num_components = 0;
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std::size_t children_of_root;
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std::size_t dfs_time = 0;
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std::stack<edge_t> S;
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std::vector<char> is_articulation_point(num_vertices(g));
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biconnected_components_visitor<ComponentMap, DiscoverTimeMap,
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LowPointMap, PredecessorMap, OutputIterator, std::stack<edge_t>,
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std::vector<char>, VertexIndexMap, DFSVisitor>
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vis(comp, num_components, children_of_root, dtm, dfs_time,
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lowpt, pred, out, S, is_articulation_point, index_map, dfs_vis);
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depth_first_search(g, visitor(vis).vertex_index_map(index_map));
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return std::pair<std::size_t, OutputIterator>(num_components, vis.out);
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}
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template <typename PredecessorMap>
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struct bicomp_dispatch3
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{
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, typename DiscoverTimeMap,
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typename LowPointMap, class P, class T, class R>
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static std::pair<std::size_t, OutputIterator> apply (const Graph & g,
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ComponentMap comp, OutputIterator out, VertexIndexMap index_map,
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DiscoverTimeMap dtm, LowPointMap lowpt,
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const bgl_named_params<P, T, R>& params, PredecessorMap pred)
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{
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return biconnected_components_impl
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(g, comp, out, index_map, dtm, lowpt, pred,
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choose_param(get_param(params, graph_visitor),
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make_dfs_visitor(null_visitor())));
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}
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};
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template <>
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struct bicomp_dispatch3<param_not_found>
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{
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, typename DiscoverTimeMap,
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typename LowPointMap, class P, class T, class R>
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static std::pair<std::size_t, OutputIterator> apply (const Graph & g,
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ComponentMap comp, OutputIterator out, VertexIndexMap index_map,
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DiscoverTimeMap dtm, LowPointMap lowpt,
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const bgl_named_params<P, T, R>& params,
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param_not_found)
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{
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typedef typename graph_traits<Graph>::vertex_descriptor vertex_t;
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std::vector<vertex_t> pred(num_vertices(g));
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vertex_t vert = graph_traits<Graph>::null_vertex();
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return biconnected_components_impl
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(g, comp, out, index_map, dtm, lowpt,
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make_iterator_property_map(pred.begin(), index_map, vert),
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choose_param(get_param(params, graph_visitor),
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make_dfs_visitor(null_visitor())));
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}
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};
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template <typename LowPointMap>
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struct bicomp_dispatch2
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{
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, typename DiscoverTimeMap,
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typename P, typename T, typename R>
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static std::pair<std::size_t, OutputIterator> apply (const Graph& g,
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ComponentMap comp, OutputIterator out, VertexIndexMap index_map,
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DiscoverTimeMap dtm, const bgl_named_params<P, T, R>& params,
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LowPointMap lowpt)
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{
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typedef typename get_param_type< vertex_predecessor_t, bgl_named_params<P,T,R> >::type dispatch_type;
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return bicomp_dispatch3<dispatch_type>::apply
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(g, comp, out, index_map, dtm, lowpt, params,
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get_param(params, vertex_predecessor));
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}
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};
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template <>
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struct bicomp_dispatch2<param_not_found>
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{
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, typename DiscoverTimeMap,
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typename P, typename T, typename R>
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static std::pair<std::size_t, OutputIterator> apply (const Graph& g,
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ComponentMap comp, OutputIterator out, VertexIndexMap index_map,
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DiscoverTimeMap dtm, const bgl_named_params<P, T, R>& params,
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param_not_found)
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{
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typedef typename graph_traits<Graph>::vertices_size_type
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vertices_size_type;
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std::vector<vertices_size_type> lowpt(num_vertices(g));
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vertices_size_type vst(0);
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typedef typename get_param_type< vertex_predecessor_t, bgl_named_params<P,T,R> >::type dispatch_type;
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return bicomp_dispatch3<dispatch_type>::apply
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(g, comp, out, index_map, dtm,
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make_iterator_property_map(lowpt.begin(), index_map, vst),
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params, get_param(params, vertex_predecessor));
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}
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};
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template <typename DiscoverTimeMap>
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struct bicomp_dispatch1
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{
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, class P, class T, class R>
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static std::pair<std::size_t, OutputIterator> apply(const Graph& g,
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ComponentMap comp, OutputIterator out, VertexIndexMap index_map,
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const bgl_named_params<P, T, R>& params, DiscoverTimeMap dtm)
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{
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typedef typename get_param_type< vertex_lowpoint_t, bgl_named_params<P,T,R> >::type dispatch_type;
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return bicomp_dispatch2<dispatch_type>::apply
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(g, comp, out, index_map, dtm, params,
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get_param(params, vertex_lowpoint));
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}
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};
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template <>
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struct bicomp_dispatch1<param_not_found>
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{
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename VertexIndexMap, class P, class T, class R>
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static std::pair<std::size_t, OutputIterator> apply(const Graph& g,
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ComponentMap comp, OutputIterator out, VertexIndexMap index_map,
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const bgl_named_params<P, T, R>& params, param_not_found)
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{
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typedef typename graph_traits<Graph>::vertices_size_type
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vertices_size_type;
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std::vector<vertices_size_type> discover_time(num_vertices(g));
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vertices_size_type vst(0);
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typedef typename get_param_type< vertex_lowpoint_t, bgl_named_params<P,T,R> >::type dispatch_type;
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return bicomp_dispatch2<dispatch_type>::apply
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(g, comp, out, index_map,
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make_iterator_property_map(discover_time.begin(), index_map, vst),
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params, get_param(params, vertex_lowpoint));
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}
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};
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}
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template<typename Graph, typename ComponentMap, typename OutputIterator,
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typename DiscoverTimeMap, typename LowPointMap>
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std::pair<std::size_t, OutputIterator>
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biconnected_components(const Graph& g, ComponentMap comp,
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OutputIterator out, DiscoverTimeMap dtm, LowPointMap lowpt)
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{
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typedef param_not_found dispatch_type;
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return detail::bicomp_dispatch3<dispatch_type>::apply
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(g, comp, out,
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get(vertex_index, g),
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dtm, lowpt,
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bgl_named_params<int, buffer_param_t>(0),
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param_not_found());
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}
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template <typename Graph, typename ComponentMap, typename OutputIterator,
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typename P, typename T, typename R>
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std::pair<std::size_t, OutputIterator>
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biconnected_components(const Graph& g, ComponentMap comp, OutputIterator out,
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const bgl_named_params<P, T, R>& params)
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{
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typedef typename get_param_type< vertex_discover_time_t, bgl_named_params<P,T,R> >::type dispatch_type;
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return detail::bicomp_dispatch1<dispatch_type>::apply(g, comp, out,
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choose_const_pmap(get_param(params, vertex_index), g, vertex_index),
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params, get_param(params, vertex_discover_time));
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}
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template < typename Graph, typename ComponentMap, typename OutputIterator>
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std::pair<std::size_t, OutputIterator>
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biconnected_components(const Graph& g, ComponentMap comp, OutputIterator out)
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{
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return biconnected_components(g, comp, out,
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bgl_named_params<int, buffer_param_t>(0));
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}
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namespace graph_detail {
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struct dummy_output_iterator
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{
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typedef std::output_iterator_tag iterator_category;
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typedef void value_type;
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typedef void pointer;
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typedef void difference_type;
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struct reference {
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template<typename T>
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reference& operator=(const T&) { return *this; }
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};
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reference operator*() const { return reference(); }
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dummy_output_iterator& operator++() { return *this; }
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dummy_output_iterator operator++(int) { return *this; }
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};
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} // end namespace graph_detail
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template <typename Graph, typename ComponentMap,
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typename P, typename T, typename R>
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std::size_t
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biconnected_components(const Graph& g, ComponentMap comp,
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const bgl_named_params<P, T, R>& params)
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{
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return biconnected_components(g, comp,
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graph_detail::dummy_output_iterator(), params).first;
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}
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template <typename Graph, typename ComponentMap>
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std::size_t
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biconnected_components(const Graph& g, ComponentMap comp)
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{
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return biconnected_components(g, comp,
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graph_detail::dummy_output_iterator()).first;
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}
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template<typename Graph, typename OutputIterator,
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typename P, typename T, typename R>
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OutputIterator
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articulation_points(const Graph& g, OutputIterator out,
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const bgl_named_params<P, T, R>& params)
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{
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return biconnected_components(g, dummy_property_map(), out,
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params).second;
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}
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template<typename Graph, typename OutputIterator>
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OutputIterator
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articulation_points(const Graph& g, OutputIterator out)
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{
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return biconnected_components(g, dummy_property_map(), out,
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bgl_named_params<int, buffer_param_t>(0)).second;
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}
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} // namespace boost
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#endif /* BOOST_GRAPH_BICONNECTED_COMPONENTS_HPP */
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