Added boost header

test/external/boost/graph/distributed/local_subgraph.hpp

@@ -0,0 +1,175 @@
+// Copyright (C) 2004-2006 The Trustees of Indiana University.
+
+// Use, modification and distribution is subject to 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)
+
+//  Authors: Douglas Gregor
+//           Andrew Lumsdaine
+#ifndef BOOST_GRAPH_LOCAL_SUBGRAPH_HPP
+#define BOOST_GRAPH_LOCAL_SUBGRAPH_HPP
+
+#ifndef BOOST_GRAPH_USE_MPI
+#error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
+#endif
+
+#include <boost/graph/graph_traits.hpp>
+#include <boost/graph/filtered_graph.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/is_base_and_derived.hpp>
+#include <boost/graph/parallel/container_traits.hpp>
+
+namespace boost {
+
+namespace graph { namespace detail {
+  // Optionally, virtually derive from a base class
+  template<bool Derive, typename Base> struct derive_from_if;
+  template<typename Base> struct derive_from_if<true, Base> : virtual Base {};
+  template<typename Base> struct derive_from_if<false, Base> {};
+
+  template<typename NewBase, typename Tag, typename OldBase = NewBase>
+  struct derive_from_if_tag_is : 
+    derive_from_if<(is_base_and_derived<OldBase, Tag>::value
+                    || is_same<OldBase, Tag>::value), 
+                   NewBase>
+  {
+  };
+} } // end namespace graph::detail
+
+template<typename DistributedGraph>
+class is_local_edge
+{
+public:
+  typedef bool result_type;
+  typedef typename graph_traits<DistributedGraph>::edge_descriptor
+    argument_type;
+
+  is_local_edge() : g(0) {}
+  is_local_edge(DistributedGraph& g) : g(&g), owner(get(vertex_owner, g)) {}
+
+  // Since either the source or target vertex must be local, the
+  // equivalence of their owners indicates a local edge.
+  result_type operator()(const argument_type& e) const
+  { return get(owner, source(e, *g)) == get(owner, target(e, *g)); }
+
+private:
+  DistributedGraph* g;
+  typename property_map<DistributedGraph, vertex_owner_t>::const_type owner;
+};
+
+template<typename DistributedGraph>
+class is_local_vertex
+{
+public:
+  typedef bool result_type;
+  typedef typename graph_traits<DistributedGraph>::vertex_descriptor
+    argument_type;
+
+  is_local_vertex() : g(0) {}
+  is_local_vertex(DistributedGraph& g) : g(&g), owner(get(vertex_owner, g)) { }
+
+  // Since either the source or target vertex must be local, the
+  // equivalence of their owners indicates a local edge.
+  result_type operator()(const argument_type& v) const
+  { 
+    return get(owner, v) == process_id(process_group(*g)); 
+  }
+
+private:
+  DistributedGraph* g;
+  typename property_map<DistributedGraph, vertex_owner_t>::const_type owner;
+};
+
+template<typename DistributedGraph>
+class local_subgraph 
+  : public filtered_graph<DistributedGraph, 
+                          is_local_edge<DistributedGraph>,
+                          is_local_vertex<DistributedGraph> >
+{
+  typedef filtered_graph<DistributedGraph, 
+                         is_local_edge<DistributedGraph>,
+                         is_local_vertex<DistributedGraph> >
+    inherited;
+  typedef typename graph_traits<DistributedGraph>::traversal_category
+    inherited_category;
+  
+public:
+  struct traversal_category :
+    graph::detail::derive_from_if_tag_is<incidence_graph_tag, 
+                                         inherited_category>,
+    graph::detail::derive_from_if_tag_is<adjacency_graph_tag, 
+                                         inherited_category>,
+    graph::detail::derive_from_if_tag_is<vertex_list_graph_tag, 
+                                         inherited_category>,
+    graph::detail::derive_from_if_tag_is<edge_list_graph_tag, 
+                                         inherited_category>,
+    graph::detail::derive_from_if_tag_is<vertex_list_graph_tag, 
+                                         inherited_category,
+                                         distributed_vertex_list_graph_tag>,
+    graph::detail::derive_from_if_tag_is<edge_list_graph_tag, 
+                                         inherited_category,
+                                         distributed_edge_list_graph_tag>
+  { };
+
+  local_subgraph(DistributedGraph& g) 
+    : inherited(g, 
+                is_local_edge<DistributedGraph>(g),
+                is_local_vertex<DistributedGraph>(g)), 
+      g(g) 
+  {
+  }
+
+  // Distributed Container
+  typedef typename boost::graph::parallel::process_group_type<DistributedGraph>::type
+    process_group_type;
+
+  process_group_type&       process_group()       
+  { 
+    using boost::graph::parallel::process_group;
+    return process_group(g); 
+  }
+  const process_group_type& process_group() const 
+  { 
+    using boost::graph::parallel::process_group;
+    return boost::graph::parallel::process_group(g); 
+  }
+  
+  DistributedGraph&         base()               { return g; }
+  const DistributedGraph&   base() const         { return g; }
+
+private:
+  DistributedGraph& g;
+};
+
+template<typename DistributedGraph, typename PropertyTag>
+class property_map<local_subgraph<DistributedGraph>, PropertyTag>
+  : public property_map<DistributedGraph, PropertyTag> { };
+
+template<typename DistributedGraph, typename PropertyTag>
+class property_map<local_subgraph<const DistributedGraph>, PropertyTag>
+{
+ public:
+  typedef typename property_map<DistributedGraph, PropertyTag>::const_type
+    type;
+  typedef type const_type;
+};
+
+template<typename PropertyTag, typename DistributedGraph>
+inline typename property_map<local_subgraph<DistributedGraph>, PropertyTag>::type
+get(PropertyTag p, local_subgraph<DistributedGraph>& g)
+{ return get(p, g.base()); }
+
+template<typename PropertyTag, typename DistributedGraph>
+inline typename property_map<local_subgraph<DistributedGraph>, PropertyTag>
+  ::const_type
+get(PropertyTag p, const local_subgraph<DistributedGraph>& g)
+{ return get(p, g.base()); } 
+
+template<typename DistributedGraph>
+inline local_subgraph<DistributedGraph> 
+make_local_subgraph(DistributedGraph& g)
+{ return local_subgraph<DistributedGraph>(g); }
+
+} // end namespace boost
+
+#endif // BOOST_GRAPH_LOCAL_SUBGRAPH_HPP