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65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
//=======================================================================
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// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
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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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#include <boost/config.hpp>
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#include <iostream>
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#include <vector>
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#include <algorithm>
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#include <utility>
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#include <boost/graph/adjacency_list.hpp>
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#include <boost/pending/disjoint_sets.hpp>
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#include <boost/graph/incremental_components.hpp>
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int
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main(int, char *[])
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{
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using namespace boost;
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// Create a graph
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typedef adjacency_list < vecS, vecS, undirectedS > Graph;
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typedef graph_traits < Graph >::vertex_descriptor Vertex;
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const int N = 6;
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Graph G(N);
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add_edge(0, 1, G);
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add_edge(1, 4, G);
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// create the disjoint-sets object, which requires rank and parent vertex properties
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std::vector < Vertex > rank(num_vertices(G));
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std::vector < Vertex > parent(num_vertices(G));
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typedef graph_traits<Graph>::vertices_size_type* Rank;
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typedef Vertex* Parent;
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disjoint_sets < Rank, Parent > ds(&rank[0], &parent[0]);
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// determine the connected components, storing the results in the disjoint-sets object
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initialize_incremental_components(G, ds);
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incremental_components(G, ds);
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// Add a couple more edges and update the disjoint-sets
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graph_traits < Graph >::edge_descriptor e;
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bool flag;
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tie(e, flag) = add_edge(4, 0, G);
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ds.union_set(4, 0);
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tie(e, flag) = add_edge(2, 5, G);
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ds.union_set(2, 5);
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graph_traits < Graph >::vertex_iterator iter, end;
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for (tie(iter, end) = vertices(G); iter != end; ++iter)
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std::cout << "representative[" << *iter << "] = " <<
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ds.find_set(*iter) << std::endl;;
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std::cout << std::endl;
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typedef component_index < unsigned int >Components;
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Components components(parent.begin(), parent.end());
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for (Components::size_type i = 0; i < components.size(); ++i) {
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std::cout << "component " << i << " contains: ";
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for (Components::value_type::iterator j = components[i].begin();
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j != components[i].end(); ++j)
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std::cout << *j << " ";
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std::cout << std::endl;
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}
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return EXIT_SUCCESS;
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}
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