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323 lines
11 KiB
C++
323 lines
11 KiB
C++
//
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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_NEIGHBOR_BREADTH_FIRST_SEARCH_HPP
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#define BOOST_GRAPH_NEIGHBOR_BREADTH_FIRST_SEARCH_HPP
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/*
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Neighbor Breadth First Search
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Like BFS, but traverses in-edges as well as out-edges.
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(for directed graphs only. use normal BFS for undirected graphs)
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*/
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#include <boost/config.hpp>
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#include <boost/ref.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/concept/assert.hpp>
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namespace boost {
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template <class Visitor, class Graph>
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struct NeighborBFSVisitorConcept {
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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_out_edge(e, g);
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vis.examine_in_edge(e, g);
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vis.tree_out_edge(e, g);
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vis.tree_in_edge(e, g);
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vis.non_tree_out_edge(e, g);
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vis.non_tree_in_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.gray_source(e, g);
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vis.black_source(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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template <class Visitors = null_visitor>
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class neighbor_bfs_visitor {
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public:
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neighbor_bfs_visitor(Visitors vis = Visitors()) : m_vis(vis) { }
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template <class Vertex, class Graph>
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void initialize_vertex(Vertex u, Graph& g) {
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invoke_visitors(m_vis, u, g, on_initialize_vertex());
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}
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template <class Vertex, class Graph>
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void discover_vertex(Vertex u, Graph& g) {
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invoke_visitors(m_vis, u, g, on_discover_vertex());
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}
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template <class Vertex, class Graph>
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void examine_vertex(Vertex u, Graph& g) {
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invoke_visitors(m_vis, u, g, on_examine_vertex());
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}
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template <class Edge, class Graph>
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void examine_out_edge(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_examine_edge());
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}
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template <class Edge, class Graph>
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void tree_out_edge(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_tree_edge());
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}
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template <class Edge, class Graph>
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void non_tree_out_edge(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_non_tree_edge());
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}
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template <class Edge, class Graph>
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void gray_target(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_gray_target());
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}
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template <class Edge, class Graph>
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void black_target(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_black_target());
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}
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template <class Edge, class Graph>
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void examine_in_edge(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_examine_edge());
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}
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template <class Edge, class Graph>
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void tree_in_edge(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_tree_edge());
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}
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template <class Edge, class Graph>
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void non_tree_in_edge(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_non_tree_edge());
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}
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template <class Edge, class Graph>
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void gray_source(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_gray_target());
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}
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template <class Edge, class Graph>
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void black_source(Edge e, Graph& g) {
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invoke_visitors(m_vis, e, g, on_black_target());
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}
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template <class Vertex, class Graph>
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void finish_vertex(Vertex u, Graph& g) {
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invoke_visitors(m_vis, u, g, on_finish_vertex());
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}
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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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neighbor_bfs_visitor<Visitors>
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make_neighbor_bfs_visitor(Visitors vis) {
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return neighbor_bfs_visitor<Visitors>(vis);
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}
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namespace detail {
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template <class BidirectionalGraph, class Buffer, class BFSVisitor,
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class ColorMap>
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void neighbor_bfs_impl
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(const BidirectionalGraph& g,
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typename graph_traits<BidirectionalGraph>::vertex_descriptor s,
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Buffer& Q, BFSVisitor vis, ColorMap color)
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{
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BOOST_CONCEPT_ASSERT(( BidirectionalGraphConcept<BidirectionalGraph> ));
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typedef graph_traits<BidirectionalGraph> GTraits;
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typedef typename GTraits::vertex_descriptor Vertex;
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typedef typename GTraits::edge_descriptor Edge;
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BOOST_CONCEPT_ASSERT((
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NeighborBFSVisitorConcept<BFSVisitor, BidirectionalGraph> ));
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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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put(color, s, Color::gray());
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vis.discover_vertex(s, g);
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Q.push(s);
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while (! Q.empty()) {
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Vertex u = Q.top();
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Q.pop(); // pop before push to avoid problem if Q is priority_queue.
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vis.examine_vertex(u, g);
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typename GTraits::out_edge_iterator ei, ei_end;
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for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) {
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Edge e = *ei;
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vis.examine_out_edge(e, g);
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Vertex v = target(e, g);
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ColorValue v_color = get(color, v);
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if (v_color == Color::white()) {
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vis.tree_out_edge(e, g);
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put(color, v, Color::gray());
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vis.discover_vertex(v, g);
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Q.push(v);
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} else {
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vis.non_tree_out_edge(e, g);
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if (v_color == Color::gray())
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vis.gray_target(e, g);
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else
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vis.black_target(e, g);
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}
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} // for out-edges
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typename GTraits::in_edge_iterator in_ei, in_ei_end;
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for (boost::tie(in_ei, in_ei_end) = in_edges(u, g);
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in_ei != in_ei_end; ++in_ei) {
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Edge e = *in_ei;
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vis.examine_in_edge(e, g);
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Vertex v = source(e, g);
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ColorValue v_color = get(color, v);
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if (v_color == Color::white()) {
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vis.tree_in_edge(e, g);
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put(color, v, Color::gray());
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vis.discover_vertex(v, g);
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Q.push(v);
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} else {
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vis.non_tree_in_edge(e, g);
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if (v_color == Color::gray())
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vis.gray_source(e, g);
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else
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vis.black_source(e, g);
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}
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} // for in-edges
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put(color, u, Color::black());
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vis.finish_vertex(u, g);
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} // while
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}
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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 neighbor_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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{
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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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// 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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put(color, *i, Color::white());
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vis.initialize_vertex(*i, g);
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}
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neighbor_bfs_impl
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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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//-------------------------------------------------------------------------
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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 neighbor_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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neighbor_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_neighbor_bfs_visitor(null_visitor())),
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params);
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}
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};
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template <>
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struct neighbor_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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std::vector<default_color_type> color_vec(num_vertices(g));
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null_visitor null_vis;
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neighbor_bfs_helper
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(g, s,
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make_iterator_property_map
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(color_vec.begin(),
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choose_const_pmap(get_param(params, vertex_index),
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g, vertex_index), color_vec[0]),
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choose_param(get_param(params, graph_visitor),
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make_neighbor_bfs_visitor(null_vis)),
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params);
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}
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};
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} // namespace detail
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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 neighbor_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::neighbor_bfs_dispatch<C>::apply(ng, s, params,
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get_param(params, vertex_color));
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}
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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 neighbor_breadth_first_visit
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(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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typedef graph_traits<IncidenceGraph> Traits;
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// Buffer default
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typedef boost::queue<typename Traits::vertex_descriptor> queue_t;
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queue_t Q;
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detail::neighbor_bfs_impl
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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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choose_param(get_param(params, graph_visitor),
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make_neighbor_bfs_visitor(null_visitor())),
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choose_pmap(get_param(params, vertex_color), g, vertex_color)
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);
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}
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} // namespace boost
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#endif // BOOST_GRAPH_NEIGHBOR_BREADTH_FIRST_SEARCH_HPP
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