summaryrefslogtreecommitdiffstats
path: root/src/boost/libs/graph/example/incremental-components-eg.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/boost/libs/graph/example/incremental-components-eg.cpp84
1 files changed, 84 insertions, 0 deletions
diff --git a/src/boost/libs/graph/example/incremental-components-eg.cpp b/src/boost/libs/graph/example/incremental-components-eg.cpp
new file mode 100644
index 00000000..7faf4418
--- /dev/null
+++ b/src/boost/libs/graph/example/incremental-components-eg.cpp
@@ -0,0 +1,84 @@
+//=======================================================================
+// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
+// Copyright 2009 Trustees of Indiana University.
+// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek, Michael Hansen
+//
+// 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 <iostream>
+#include <vector>
+
+#include <boost/foreach.hpp>
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/incremental_components.hpp>
+#include <boost/pending/disjoint_sets.hpp>
+
+using namespace boost;
+
+int main(int argc, char* argv[])
+{
+ typedef adjacency_list <vecS, vecS, undirectedS> Graph;
+ typedef graph_traits<Graph>::vertex_descriptor Vertex;
+ //typedef graph_traits<Graph>::edge_descriptor Edge;
+ typedef graph_traits<Graph>::vertices_size_type VertexIndex;
+
+ // Create a graph
+ const int VERTEX_COUNT = 6;
+ Graph graph(VERTEX_COUNT);
+
+ add_edge(0, 1, graph);
+ add_edge(1, 4, graph);
+
+ // reate the disjoint-sets object, which requires rank and parent
+ // vertex properties.
+ std::vector<Vertex> rank(num_vertices(graph));
+ std::vector<Vertex> parent(num_vertices(graph));
+
+ typedef VertexIndex* Rank;
+ typedef Vertex* Parent;
+ disjoint_sets<Rank, Parent> ds(&rank[0], &parent[0]);
+
+ // Determine the connected components, storing the results in the
+ // disjoint-sets object.
+ initialize_incremental_components(graph, ds);
+ incremental_components(graph, ds);
+
+ // Add a couple more edges and update the disjoint-sets
+ add_edge(4, 0, graph);
+ add_edge(2, 5, graph);
+
+ ds.union_set(4, 0);
+ ds.union_set(2, 5);
+
+ BOOST_FOREACH(Vertex current_vertex, vertices(graph)) {
+ std::cout << "representative[" << current_vertex << "] = " <<
+ ds.find_set(current_vertex) << std::endl;
+ }
+
+ std::cout << std::endl;
+
+ // Generate component index. NOTE: We would need to pass in a vertex
+ // index map into the component_index constructor if our graph type
+ // used listS instead of vecS (identity_property_map is used by
+ // default).
+ typedef component_index<VertexIndex> Components;
+ Components components(parent.begin(), parent.end());
+
+ // Iterate through the component indices
+ BOOST_FOREACH(VertexIndex component_index, components) {
+ std::cout << "component " << component_index << " contains: ";
+
+ // Iterate through the child vertex indices for [component_index]
+ BOOST_FOREACH(VertexIndex child_index,
+ components[component_index]) {
+ std::cout << child_index << " ";
+ }
+
+ std::cout << std::endl;
+ }
+
+ return (0);
+}