79 lines
2.3 KiB
C++
79 lines
2.3 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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// 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/graph/dag_shortest_paths.hpp>
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#include <boost/graph/adjacency_list.hpp>
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#include <iostream>
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// Example from Introduction to Algorithms by Cormen, et all p.537.
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// Sample output:
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// r: inifinity
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// s: 0
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// t: 2
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// u: 6
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// v: 5
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// x: 3
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int main()
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{
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using namespace boost;
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typedef adjacency_list< vecS, vecS, directedS,
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property< vertex_distance_t, int >, property< edge_weight_t, int > >
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graph_t;
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graph_t g(6);
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enum verts
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{
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r,
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s,
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t,
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u,
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v,
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x
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};
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char name[] = "rstuvx";
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add_edge(r, s, 5, g);
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add_edge(r, t, 3, g);
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add_edge(s, t, 2, g);
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add_edge(s, u, 6, g);
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add_edge(t, u, 7, g);
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add_edge(t, v, 4, g);
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add_edge(t, x, 2, g);
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add_edge(u, v, -1, g);
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add_edge(u, x, 1, g);
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add_edge(v, x, -2, g);
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property_map< graph_t, vertex_distance_t >::type d_map
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= get(vertex_distance, g);
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#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
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// VC++ has trouble with the named-parameter mechanism, so
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// we make a direct call to the underlying implementation function.
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std::vector< default_color_type > color(num_vertices(g));
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std::vector< std::size_t > pred(num_vertices(g));
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default_dijkstra_visitor vis;
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std::less< int > compare;
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closed_plus< int > combine;
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property_map< graph_t, edge_weight_t >::type w_map = get(edge_weight, g);
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dag_shortest_paths(g, s, d_map, w_map, &color[0], &pred[0], vis, compare,
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combine, (std::numeric_limits< int >::max)(), 0);
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#else
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dag_shortest_paths(g, s, distance_map(d_map));
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#endif
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graph_traits< graph_t >::vertex_iterator vi, vi_end;
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for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
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if (d_map[*vi] == (std::numeric_limits< int >::max)())
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std::cout << name[*vi] << ": inifinity\n";
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else
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std::cout << name[*vi] << ": " << d_map[*vi] << '\n';
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return 0;
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}
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