1 files changed, 77 insertions, 0 deletions
diff --git a/src/boost/libs/graph/example/dijkstra-example.cpp b/src/boost/libs/graph/example/dijkstra-example.cpp
new file mode 100644
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--- /dev/null
+++ b/src/boost/libs/graph/example/dijkstra-example.cpp
@@ -0,0 +1,77 @@
+//=======================================================================
+// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee, 
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//=======================================================================
+#include <boost/config.hpp>
+#include <iostream>
+#include <fstream>
+
+#include <boost/graph/graph_traits.hpp>
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/dijkstra_shortest_paths.hpp>
+#include <boost/property_map/property_map.hpp>
+
+using namespace boost;
+
+int
+main(int, char *[])
+{
+  typedef adjacency_list < listS, vecS, directedS,
+    no_property, property < edge_weight_t, int > > graph_t;
+  typedef graph_traits < graph_t >::vertex_descriptor vertex_descriptor;
+  typedef std::pair<int, int> Edge;
+
+  const int num_nodes = 5;
+  enum nodes { A, B, C, D, E };
+  char name[] = "ABCDE";
+  Edge edge_array[] = { Edge(A, C), Edge(B, B), Edge(B, D), Edge(B, E),
+    Edge(C, B), Edge(C, D), Edge(D, E), Edge(E, A), Edge(E, B)
+  };
+  int weights[] = { 1, 2, 1, 2, 7, 3, 1, 1, 1 };
+  int num_arcs = sizeof(edge_array) / sizeof(Edge);
+  graph_t g(edge_array, edge_array + num_arcs, weights, num_nodes);
+  property_map<graph_t, edge_weight_t>::type weightmap = get(edge_weight, g);
+  std::vector<vertex_descriptor> p(num_vertices(g));
+  std::vector<int> d(num_vertices(g));
+  vertex_descriptor s = vertex(A, g);
+
+  dijkstra_shortest_paths(g, s,
+                          predecessor_map(boost::make_iterator_property_map(p.begin(), get(boost::vertex_index, g))).
+                          distance_map(boost::make_iterator_property_map(d.begin(), get(boost::vertex_index, g))));
+
+  std::cout << "distances and parents:" << std::endl;
+  graph_traits < graph_t >::vertex_iterator vi, vend;
+  for (boost::tie(vi, vend) = vertices(g); vi != vend; ++vi) {
+    std::cout << "distance(" << name[*vi] << ") = " << d[*vi] << ", ";
+    std::cout << "parent(" << name[*vi] << ") = " << name[p[*vi]] << std::
+      endl;
+  }
+  std::cout << std::endl;
+
+  std::ofstream dot_file("figs/dijkstra-eg.dot");
+
+  dot_file << "digraph D {\n"
+    << "  rankdir=LR\n"
+    << "  size=\"4,3\"\n"
+    << "  ratio=\"fill\"\n"
+    << "  edge[style=\"bold\"]\n" << "  node[shape=\"circle\"]\n";
+
+  graph_traits < graph_t >::edge_iterator ei, ei_end;
+  for (boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) {
+    graph_traits < graph_t >::edge_descriptor e = *ei;
+    graph_traits < graph_t >::vertex_descriptor
+      u = source(e, g), v = target(e, g);
+    dot_file << name[u] << " -> " << name[v]
+      << "[label=\"" << get(weightmap, e) << "\"";
+    if (p[v] == u)
+      dot_file << ", color=\"black\"";
+    else
+      dot_file << ", color=\"grey\"";
+    dot_file << "]";
+  }
+  dot_file << "}";
+  return EXIT_SUCCESS;
+}