Added thirdparty: boost library

thirdparty/include/boost/graph/make_connected.hpp

@@ -0,0 +1,79 @@
+//=======================================================================
+// Copyright 2007 Aaron Windsor
+//
+// 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)
+//=======================================================================
+#ifndef __MAKE_CONNECTED_HPP__
+#define __MAKE_CONNECTED_HPP__
+
+#include <boost/config.hpp>
+#include <boost/next_prior.hpp>
+#include <boost/tuple/tuple.hpp> //for tie
+#include <boost/graph/connected_components.hpp>
+#include <boost/property_map/property_map.hpp>
+#include <vector>
+
+#include <boost/graph/planar_detail/add_edge_visitors.hpp>
+#include <boost/graph/planar_detail/bucket_sort.hpp>
+
+namespace boost
+{
+
+template < typename Graph, typename VertexIndexMap, typename AddEdgeVisitor >
+void make_connected(Graph& g, VertexIndexMap vm, AddEdgeVisitor& vis)
+{
+    typedef typename graph_traits< Graph >::vertex_iterator vertex_iterator_t;
+    typedef typename graph_traits< Graph >::vertex_descriptor vertex_t;
+    typedef typename graph_traits< Graph >::vertices_size_type v_size_t;
+    typedef iterator_property_map< typename std::vector< v_size_t >::iterator,
+        VertexIndexMap >
+        vertex_to_v_size_map_t;
+
+    std::vector< v_size_t > component_vector(num_vertices(g));
+    vertex_to_v_size_map_t component(component_vector.begin(), vm);
+    std::vector< vertex_t > vertices_by_component(num_vertices(g));
+
+    v_size_t num_components = connected_components(g, component);
+
+    if (num_components < 2)
+        return;
+
+    vertex_iterator_t vi, vi_end;
+    boost::tie(vi, vi_end) = vertices(g);
+    std::copy(vi, vi_end, vertices_by_component.begin());
+
+    bucket_sort(vertices_by_component.begin(), vertices_by_component.end(),
+        component, num_components);
+
+    typedef typename std::vector< vertex_t >::iterator vec_of_vertices_itr_t;
+
+    vec_of_vertices_itr_t ci_end = vertices_by_component.end();
+    vec_of_vertices_itr_t ci_prev = vertices_by_component.begin();
+    if (ci_prev == ci_end)
+        return;
+
+    for (vec_of_vertices_itr_t ci = boost::next(ci_prev); ci != ci_end;
+         ci_prev = ci, ++ci)
+    {
+        if (component[*ci_prev] != component[*ci])
+            vis.visit_vertex_pair(*ci_prev, *ci, g);
+    }
+}
+
+template < typename Graph, typename VertexIndexMap >
+inline void make_connected(Graph& g, VertexIndexMap vm)
+{
+    default_add_edge_visitor vis;
+    make_connected(g, vm, vis);
+}
+
+template < typename Graph > inline void make_connected(Graph& g)
+{
+    make_connected(g, get(vertex_index, g));
+}
+
+} // namespace boost
+
+#endif //__MAKE_CONNECTED_HPP__