107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
//=======================================================================
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// Copyright 1997-2001 University of Notre Dame.
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// Authors: 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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#error \
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"This example appears to be incorrect; it uses edge weights that are smaller than 0 using the comparison operator passed to Dijkstra's algorithm, which is not allowed."
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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/graph_utility.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(a) = 0
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distance(b) = 3
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distance(c) = 1
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distance(d) = 3
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distance(e) = 3
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min-max paths tree
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a --> c
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b -->
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c --> d
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d --> e
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e --> b
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*/
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int main(int, char*[])
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{
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using namespace boost;
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typedef adjacency_list< listS, vecS, directedS, no_property,
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property< edge_weight_t, int > >
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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 char name[] = "abcdef";
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const int num_nodes = 6;
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E edges[] = { E(0, 2), E(1, 1), E(1, 3), E(1, 4), E(2, 1), E(2, 3), 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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const int n_edges = sizeof(edges) / sizeof(E);
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#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
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// VC++ can't handle iterator constructors
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Graph G(num_nodes);
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property_map< Graph, edge_weight_t >::type weightmap = get(edge_weight, G);
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for (std::size_t j = 0; j < sizeof(edges) / sizeof(E); ++j)
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{
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graph_traits< Graph >::edge_descriptor e;
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bool inserted;
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boost::tie(e, inserted) = add_edge(edges[j].first, edges[j].second, G);
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weightmap[e] = weights[j];
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}
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#else
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Graph G(edges, edges + n_edges, weights, num_nodes);
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property_map< Graph, edge_weight_t >::type weightmap = get(edge_weight, G);
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#endif
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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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#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
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dijkstra_shortest_paths(G, s, &p[0], &d[0], weightmap, get(vertex_index, G),
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std::greater< int >(), closed_plus< int >(),
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(std::numeric_limits< int >::max)(), 0, default_dijkstra_visitor());
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#else
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dijkstra_shortest_paths(G, s,
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distance_map(&d[0]).predecessor_map(&p[0]).distance_compare(
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std::greater< int >()));
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#endif
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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 (boost::tie(vi, vend) = vertices(G); vi != vend; ++vi)
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std::cout << "distance(" << name[*vi] << ") = " << d[*vi] << std::endl;
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std::cout << std::endl;
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std::cout << "min-max paths tree" << std::endl;
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adjacency_list<> tree(num_nodes);
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for (boost::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, name);
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return 0;
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}
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