414 lines
15 KiB
Plaintext
414 lines
15 KiB
Plaintext
//
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//=======================================================================
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// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
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// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
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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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//=======================================================================
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//
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#ifndef BOOST_GRAPH_BREADTH_FIRST_SEARCH_HPP
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#define BOOST_GRAPH_BREADTH_FIRST_SEARCH_HPP
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/*
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Breadth First Search Algorithm (Cormen, Leiserson, and Rivest p. 470)
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*/
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#include <boost/config.hpp>
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#include <vector>
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#include <boost/pending/queue.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/graph/visitors.hpp>
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#include <boost/graph/named_function_params.hpp>
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#include <boost/graph/overloading.hpp>
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#include <boost/graph/graph_concepts.hpp>
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#include <boost/graph/two_bit_color_map.hpp>
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#include <boost/concept/assert.hpp>
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#ifdef BOOST_GRAPH_USE_MPI
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#include <boost/graph/distributed/concepts.hpp>
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#endif // BOOST_GRAPH_USE_MPI
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namespace boost {
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template <class Visitor, class Graph>
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struct BFSVisitorConcept {
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void constraints() {
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BOOST_CONCEPT_ASSERT(( CopyConstructibleConcept<Visitor> ));
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vis.initialize_vertex(u, g);
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vis.discover_vertex(u, g);
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vis.examine_vertex(u, g);
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vis.examine_edge(e, g);
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vis.tree_edge(e, g);
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vis.non_tree_edge(e, g);
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vis.gray_target(e, g);
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vis.black_target(e, g);
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vis.finish_vertex(u, g);
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}
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Visitor vis;
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Graph g;
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typename graph_traits<Graph>::vertex_descriptor u;
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typename graph_traits<Graph>::edge_descriptor e;
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};
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// Multiple-source version
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template <class IncidenceGraph, class Buffer, class BFSVisitor,
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class ColorMap, class SourceIterator>
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void breadth_first_visit
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(const IncidenceGraph& g,
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SourceIterator sources_begin, SourceIterator sources_end,
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Buffer& Q, BFSVisitor vis, ColorMap color)
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{
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BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept<IncidenceGraph> ));
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typedef graph_traits<IncidenceGraph> GTraits;
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typedef typename GTraits::vertex_descriptor Vertex;
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BOOST_CONCEPT_ASSERT(( BFSVisitorConcept<BFSVisitor, IncidenceGraph> ));
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BOOST_CONCEPT_ASSERT(( ReadWritePropertyMapConcept<ColorMap, Vertex> ));
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typedef typename property_traits<ColorMap>::value_type ColorValue;
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typedef color_traits<ColorValue> Color;
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typename GTraits::out_edge_iterator ei, ei_end;
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for (; sources_begin != sources_end; ++sources_begin) {
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Vertex s = *sources_begin;
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put(color, s, Color::gray()); vis.discover_vertex(s, g);
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Q.push(s);
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}
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while (! Q.empty()) {
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Vertex u = Q.top(); Q.pop(); vis.examine_vertex(u, g);
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for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) {
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Vertex v = target(*ei, g); vis.examine_edge(*ei, g);
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ColorValue v_color = get(color, v);
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if (v_color == Color::white()) { vis.tree_edge(*ei, g);
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put(color, v, Color::gray()); vis.discover_vertex(v, g);
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Q.push(v);
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} else { vis.non_tree_edge(*ei, g);
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if (v_color == Color::gray()) vis.gray_target(*ei, g);
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else vis.black_target(*ei, g);
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}
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} // end for
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put(color, u, Color::black()); vis.finish_vertex(u, g);
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} // end while
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} // breadth_first_visit
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// Single-source version
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template <class IncidenceGraph, class Buffer, class BFSVisitor,
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class ColorMap>
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void breadth_first_visit
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(const IncidenceGraph& g,
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typename graph_traits<IncidenceGraph>::vertex_descriptor s,
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Buffer& Q, BFSVisitor vis, ColorMap color)
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{
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typename graph_traits<IncidenceGraph>::vertex_descriptor sources[1] = {s};
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breadth_first_visit(g, sources, sources + 1, Q, vis, color);
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}
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template <class VertexListGraph, class SourceIterator,
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class Buffer, class BFSVisitor,
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class ColorMap>
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void breadth_first_search
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(const VertexListGraph& g,
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SourceIterator sources_begin, SourceIterator sources_end,
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Buffer& Q, BFSVisitor vis, ColorMap color)
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{
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// Initialization
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typedef typename property_traits<ColorMap>::value_type ColorValue;
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typedef color_traits<ColorValue> Color;
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typename boost::graph_traits<VertexListGraph>::vertex_iterator i, i_end;
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for (boost::tie(i, i_end) = vertices(g); i != i_end; ++i) {
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vis.initialize_vertex(*i, g);
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put(color, *i, Color::white());
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}
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breadth_first_visit(g, sources_begin, sources_end, Q, vis, color);
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}
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template <class VertexListGraph, class Buffer, class BFSVisitor,
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class ColorMap>
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void breadth_first_search
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(const VertexListGraph& g,
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typename graph_traits<VertexListGraph>::vertex_descriptor s,
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Buffer& Q, BFSVisitor vis, ColorMap color)
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{
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typename graph_traits<VertexListGraph>::vertex_descriptor sources[1] = {s};
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breadth_first_search(g, sources, sources + 1, Q, vis, color);
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}
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namespace graph { struct bfs_visitor_event_not_overridden {}; }
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template <class Visitors = null_visitor>
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class bfs_visitor {
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public:
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bfs_visitor() { }
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bfs_visitor(Visitors vis) : m_vis(vis) { }
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template <class Vertex, class Graph>
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graph::bfs_visitor_event_not_overridden
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initialize_vertex(Vertex u, Graph& g)
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{
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invoke_visitors(m_vis, u, g, ::boost::on_initialize_vertex());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Vertex, class Graph>
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graph::bfs_visitor_event_not_overridden
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discover_vertex(Vertex u, Graph& g)
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{
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invoke_visitors(m_vis, u, g, ::boost::on_discover_vertex());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Vertex, class Graph>
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graph::bfs_visitor_event_not_overridden
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examine_vertex(Vertex u, Graph& g)
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{
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invoke_visitors(m_vis, u, g, ::boost::on_examine_vertex());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Edge, class Graph>
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graph::bfs_visitor_event_not_overridden
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examine_edge(Edge e, Graph& g)
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{
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invoke_visitors(m_vis, e, g, ::boost::on_examine_edge());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Edge, class Graph>
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graph::bfs_visitor_event_not_overridden
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tree_edge(Edge e, Graph& g)
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{
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invoke_visitors(m_vis, e, g, ::boost::on_tree_edge());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Edge, class Graph>
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graph::bfs_visitor_event_not_overridden
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non_tree_edge(Edge e, Graph& g)
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{
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invoke_visitors(m_vis, e, g, ::boost::on_non_tree_edge());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Edge, class Graph>
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graph::bfs_visitor_event_not_overridden
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gray_target(Edge e, Graph& g)
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{
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invoke_visitors(m_vis, e, g, ::boost::on_gray_target());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Edge, class Graph>
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graph::bfs_visitor_event_not_overridden
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black_target(Edge e, Graph& g)
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{
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invoke_visitors(m_vis, e, g, ::boost::on_black_target());
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return graph::bfs_visitor_event_not_overridden();
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}
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template <class Vertex, class Graph>
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graph::bfs_visitor_event_not_overridden
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finish_vertex(Vertex u, Graph& g)
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{
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invoke_visitors(m_vis, u, g, ::boost::on_finish_vertex());
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return graph::bfs_visitor_event_not_overridden();
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}
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BOOST_GRAPH_EVENT_STUB(on_initialize_vertex,bfs)
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BOOST_GRAPH_EVENT_STUB(on_discover_vertex,bfs)
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BOOST_GRAPH_EVENT_STUB(on_examine_vertex,bfs)
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BOOST_GRAPH_EVENT_STUB(on_examine_edge,bfs)
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BOOST_GRAPH_EVENT_STUB(on_tree_edge,bfs)
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BOOST_GRAPH_EVENT_STUB(on_non_tree_edge,bfs)
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BOOST_GRAPH_EVENT_STUB(on_gray_target,bfs)
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BOOST_GRAPH_EVENT_STUB(on_black_target,bfs)
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BOOST_GRAPH_EVENT_STUB(on_finish_vertex,bfs)
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protected:
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Visitors m_vis;
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};
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template <class Visitors>
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bfs_visitor<Visitors>
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make_bfs_visitor(Visitors vis) {
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return bfs_visitor<Visitors>(vis);
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}
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typedef bfs_visitor<> default_bfs_visitor;
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namespace detail {
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template <class VertexListGraph, class ColorMap, class BFSVisitor,
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class P, class T, class R>
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void bfs_helper
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(VertexListGraph& g,
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typename graph_traits<VertexListGraph>::vertex_descriptor s,
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ColorMap color,
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BFSVisitor vis,
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const bgl_named_params<P, T, R>& params,
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boost::mpl::false_)
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{
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typedef graph_traits<VertexListGraph> Traits;
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// Buffer default
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typedef typename Traits::vertex_descriptor Vertex;
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typedef boost::queue<Vertex> queue_t;
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queue_t Q;
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breadth_first_search
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(g, s,
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choose_param(get_param(params, buffer_param_t()), boost::ref(Q)).get(),
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vis, color);
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}
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#ifdef BOOST_GRAPH_USE_MPI
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template <class DistributedGraph, class ColorMap, class BFSVisitor,
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class P, class T, class R>
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void bfs_helper
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(DistributedGraph& g,
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typename graph_traits<DistributedGraph>::vertex_descriptor s,
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ColorMap color,
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BFSVisitor vis,
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const bgl_named_params<P, T, R>& params,
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boost::mpl::true_);
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#endif // BOOST_GRAPH_USE_MPI
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//-------------------------------------------------------------------------
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// Choose between default color and color parameters. Using
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// function dispatching so that we don't require vertex index if
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// the color default is not being used.
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template <class ColorMap>
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struct bfs_dispatch {
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template <class VertexListGraph, class P, class T, class R>
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static void apply
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(VertexListGraph& g,
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typename graph_traits<VertexListGraph>::vertex_descriptor s,
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const bgl_named_params<P, T, R>& params,
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ColorMap color)
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{
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bfs_helper
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(g, s, color,
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choose_param(get_param(params, graph_visitor),
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make_bfs_visitor(null_visitor())),
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params,
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boost::mpl::bool_<
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boost::is_base_and_derived<
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distributed_graph_tag,
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typename graph_traits<VertexListGraph>::traversal_category>::value>());
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}
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};
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template <>
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struct bfs_dispatch<param_not_found> {
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template <class VertexListGraph, class P, class T, class R>
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static void apply
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(VertexListGraph& g,
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typename graph_traits<VertexListGraph>::vertex_descriptor s,
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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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null_visitor null_vis;
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bfs_helper
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(g, s,
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make_two_bit_color_map
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(num_vertices(g),
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choose_const_pmap(get_param(params, vertex_index),
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g, vertex_index)),
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choose_param(get_param(params, graph_visitor),
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make_bfs_visitor(null_vis)),
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params,
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boost::mpl::bool_<
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boost::is_base_and_derived<
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distributed_graph_tag,
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typename graph_traits<VertexListGraph>::traversal_category>::value>());
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}
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};
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} // namespace detail
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#if 1
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// Named Parameter Variant
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template <class VertexListGraph, class P, class T, class R>
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void breadth_first_search
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(const VertexListGraph& g,
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typename graph_traits<VertexListGraph>::vertex_descriptor s,
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const bgl_named_params<P, T, R>& params)
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{
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// The graph is passed by *const* reference so that graph adaptors
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// (temporaries) can be passed into this function. However, the
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// graph is not really const since we may write to property maps
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// of the graph.
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VertexListGraph& ng = const_cast<VertexListGraph&>(g);
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typedef typename get_param_type< vertex_color_t, bgl_named_params<P,T,R> >::type C;
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detail::bfs_dispatch<C>::apply(ng, s, params,
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get_param(params, vertex_color));
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}
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#endif
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// This version does not initialize colors, user has to.
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template <class IncidenceGraph, class P, class T, class R>
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void breadth_first_visit
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(const IncidenceGraph& g,
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typename graph_traits<IncidenceGraph>::vertex_descriptor s,
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const bgl_named_params<P, T, R>& params)
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{
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// The graph is passed by *const* reference so that graph adaptors
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// (temporaries) can be passed into this function. However, the
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// graph is not really const since we may write to property maps
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// of the graph.
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IncidenceGraph& ng = const_cast<IncidenceGraph&>(g);
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typedef graph_traits<IncidenceGraph> Traits;
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// Buffer default
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typedef typename Traits::vertex_descriptor vertex_descriptor;
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typedef boost::queue<vertex_descriptor> queue_t;
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queue_t Q;
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breadth_first_visit
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(ng, s,
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choose_param(get_param(params, buffer_param_t()), boost::ref(Q)).get(),
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choose_param(get_param(params, graph_visitor),
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make_bfs_visitor(null_visitor())),
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choose_pmap(get_param(params, vertex_color), ng, vertex_color)
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);
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}
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namespace graph {
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namespace detail {
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template <typename Graph, typename Source>
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struct breadth_first_search_impl {
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typedef void result_type;
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template <typename ArgPack>
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void operator()(const Graph& g, const Source& source, const ArgPack& arg_pack) {
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using namespace boost::graph::keywords;
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typename boost::graph_traits<Graph>::vertex_descriptor sources[1] = {source};
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boost::queue<typename boost::graph_traits<Graph>::vertex_descriptor> Q;
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boost::breadth_first_search(g,
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&sources[0],
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&sources[1],
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boost::unwrap_ref(arg_pack[_buffer | boost::ref(Q)]),
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arg_pack[_visitor | make_bfs_visitor(null_visitor())],
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boost::detail::make_color_map_from_arg_pack(g, arg_pack));
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}
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};
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}
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BOOST_GRAPH_MAKE_FORWARDING_FUNCTION(breadth_first_search, 2, 4)
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}
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#if 0
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// Named Parameter Variant
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BOOST_GRAPH_MAKE_OLD_STYLE_PARAMETER_FUNCTION(breadth_first_search, 2)
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#endif
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} // namespace boost
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#ifdef BOOST_GRAPH_USE_MPI
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# include <boost/graph/distributed/breadth_first_search.hpp>
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#endif
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#endif // BOOST_GRAPH_BREADTH_FIRST_SEARCH_HPP
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