Added boost header

test/external/boost/graph/parallel/basic_reduce.hpp

@@ -0,0 +1,42 @@
+// Copyright 2005 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_PARALLEL_BASIC_REDUCE_HPP
+#define BOOST_PARALLEL_BASIC_REDUCE_HPP
+
+#ifndef BOOST_GRAPH_USE_MPI
+#error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
+#endif
+
+namespace boost { namespace parallel {
+
+/** Reduction operation used to reconcile differences between local
+ * and remote values for a particular key in a property map.  The
+ * type @c T is typically the @c value_type of the property
+ * map. This basic reduction returns a default-constructed @c T as
+ * the default value and always resolves to the remote value.
+ */
+template<typename T>
+struct basic_reduce
+{
+  BOOST_STATIC_CONSTANT(bool, non_default_resolver = false);
+
+  /// Returns a default-constructed T object
+  template<typename Key>
+  T operator()(const Key&) const { return T(); }
+  
+  /// Returns the remote value
+  template<typename Key>
+  const T& operator()(const Key&, const T&, const T& remote) const 
+  { return remote; }
+};
+
+} } // end namespace boost::parallel
+
+#endif // BOOST_PARALLEL_BASIC_REDUCE_HPP