84 lines
3.2 KiB
C++
84 lines
3.2 KiB
C++
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//=======================================================================
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// Copyright 2002 Indiana University.
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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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#ifndef BOOST_CREATE_CONDENSATION_GRAPH_HPP
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#define BOOST_CREATE_CONDENSATION_GRAPH_HPP
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#include <boost/graph/graph_traits.hpp>
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#include <boost/property_map/property_map.hpp>
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namespace boost {
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template <typename Graph, typename ComponentLists,
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typename ComponentNumberMap,
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typename CondensationGraph, typename EdgeMultiplicityMap>
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void create_condensation_graph(const Graph& g,
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const ComponentLists& components,
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ComponentNumberMap component_number,
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CondensationGraph& cg,
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EdgeMultiplicityMap edge_mult_map)
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{
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typedef typename graph_traits<Graph>::vertex_descriptor vertex;
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typedef typename graph_traits<Graph>::vertices_size_type size_type;
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typedef typename graph_traits<CondensationGraph>::vertex_descriptor
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cg_vertex;
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std::vector<cg_vertex> to_cg_vertex(components.size());
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for (size_type s = 0; s < components.size(); ++s)
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to_cg_vertex[s] = add_vertex(cg);
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for (size_type si = 0; si < components.size(); ++si) {
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cg_vertex s = to_cg_vertex[si];
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std::vector<cg_vertex> adj;
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for (size_type i = 0; i < components[si].size(); ++i) {
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vertex u = components[s][i];
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typename graph_traits<Graph>::adjacency_iterator v, v_end;
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for (boost::tie(v, v_end) = adjacent_vertices(u, g); v != v_end; ++v) {
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cg_vertex t = to_cg_vertex[component_number[*v]];
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if (s != t) // Avoid loops in the condensation graph
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adj.push_back(t);
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}
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}
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std::sort(adj.begin(), adj.end());
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if (! adj.empty()) {
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size_type i = 0;
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cg_vertex t = adj[i];
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typename graph_traits<CondensationGraph>::edge_descriptor e;
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bool inserted;
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boost::tie(e, inserted) = add_edge(s, t, cg);
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put(edge_mult_map, e, 1);
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++i;
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while (i < adj.size()) {
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if (adj[i] == t)
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put(edge_mult_map, e, get(edge_mult_map, e) + 1);
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else {
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t = adj[i];
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boost::tie(e, inserted) = add_edge(s, t, cg);
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put(edge_mult_map, e, 1);
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}
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++i;
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}
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}
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}
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}
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template <typename Graph, typename ComponentLists,
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typename ComponentNumberMap, typename CondensationGraph>
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void create_condensation_graph(const Graph& g,
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const ComponentLists& components,
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ComponentNumberMap component_number,
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CondensationGraph& cg)
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{
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create_condensation_graph(g, components, component_number, cg,
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dummy_property_map());
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}
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} // namespace boost
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#endif // BOOST_CREATE_CONDENSATION_GRAPH_HPP
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