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100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
//=======================================================================
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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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// This file is part of the Boost Graph Library
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//
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// You should have received a copy of the License Agreement for the
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// Boost Graph Library along with the software; see the file LICENSE.
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// If not, contact Office of Research, University of Notre Dame, Notre
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// Dame, IN 46556.
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//
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// Permission to modify the code and to distribute modified code is
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// granted, provided the text of this NOTICE is retained, a notice that
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// the code was modified is included with the above COPYRIGHT NOTICE and
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// with the COPYRIGHT NOTICE in the LICENSE file, and that the LICENSE
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// file is distributed with the modified code.
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//
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// LICENSOR MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.
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// By way of example, but not limitation, Licensor MAKES NO
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// REPRESENTATIONS OR WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY
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// PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE COMPONENTS
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// OR DOCUMENTATION WILL NOT INFRINGE ANY PATENTS, COPYRIGHTS, TRADEMARKS
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// OR OTHER RIGHTS.
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//=======================================================================
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#include <boost/config.hpp>
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#include <iostream>
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#include <boost/graph/graph_traits.hpp>
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#include <boost/graph/adjacency_list.hpp>
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#include <boost/graph/dijkstra_shortest_paths.hpp>
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#include <boost/graph/visitors.hpp>
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#include <boost/graph/transpose_graph.hpp>
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/* Output:
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distances from start vertex:
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distance(0) = 0
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distance(1) = 6
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distance(2) = 1
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distance(3) = 4
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distance(4) = 5
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shortest paths tree
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0 --> 2
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1 -->
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2 --> 3
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3 --> 4
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4 --> 1
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*/
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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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typedef property<edge_weight_t, int> weightp;
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typedef adjacency_list< listS, vecS, directedS,
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property<vertex_color_t,default_color_type>, weightp > Graph;
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typedef graph_traits<Graph>::vertex_descriptor Vertex;
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typedef std::pair<int,int> E;
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const int num_nodes = 5;
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E edges[] = { E(0,2),
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E(1,1), E(1,3), E(1,4),
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E(2,1), E(2,3),
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E(3,4),
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E(4,0), E(4,1) };
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int weights[] = { 1, 2, 1, 2, 7, 3, 1, 1, 1};
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Graph G(num_nodes, edges, edges + sizeof(edges)/sizeof(E), weights);
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std::vector<Vertex> p(num_vertices(G));
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std::vector<int> d(num_vertices(G));
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Vertex s = *(vertices(G).first);
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p[s] = s;
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dijkstra_shortest_paths
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(G, s, distance_map(&d[0]).visitor(make_ucs_visitor
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(record_predecessors
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(&p[0], on_edge_relaxed()))));
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std::cout << "distances from start vertex:" << std::endl;
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graph_traits<Graph>::vertex_iterator vi, vend;
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for(tie(vi,vend) = vertices(G); vi != vend; ++vi)
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std::cout << "distance(" << *vi << ") = " << d[*vi] << std::endl;
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std::cout << std::endl;
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std::cout << "shortest paths tree" << std::endl;
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adjacency_list<> tree(num_nodes);
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for(tie(vi,vend) = vertices(G); vi != vend; ++vi)
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if (*vi != p[*vi])
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add_edge(p[*vi], *vi, tree);
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print_graph(tree);
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return 0;
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}
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