Added boost header

test/external/boost/mpi/collectives/all_gather.hpp

@@ -0,0 +1,82 @@
+// Copyright (C) 2005-2006 Douglas Gregor <doug.gregor -at- gmail.com>.
+
+// 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)
+
+// Message Passing Interface 1.1 -- Section 4.7. Gather-to-all
+#ifndef BOOST_MPI_ALL_GATHER_HPP
+#define BOOST_MPI_ALL_GATHER_HPP
+
+#include <boost/mpi/exception.hpp>
+#include <boost/mpi/datatype.hpp>
+#include <vector>
+#include <boost/serialization/vector.hpp>
+
+// all_gather falls back to gather+broadcast in some cases
+#include <boost/mpi/collectives/broadcast.hpp>
+#include <boost/mpi/collectives/gather.hpp>
+
+namespace boost { namespace mpi {
+
+namespace detail {
+  // We're all-gathering for a type that has an associated MPI
+  // datatype, so we'll use MPI_Gather to do all of the work.
+  template<typename T>
+  void
+  all_gather_impl(const communicator& comm, const T* in_values, int n, 
+                  T* out_values, mpl::true_)
+  {
+    MPI_Datatype type = boost::mpi::get_mpi_datatype<T>(*in_values);
+    BOOST_MPI_CHECK_RESULT(MPI_Allgather,
+                           (const_cast<T*>(in_values), n, type,
+                            out_values, n, type, comm));
+  }
+
+  // We're all-gathering for a type that has no associated MPI
+  // type. So, we'll do a manual gather followed by a broadcast.
+  template<typename T>
+  void
+  all_gather_impl(const communicator& comm, const T* in_values, int n, 
+                  T* out_values, mpl::false_)
+  {
+    gather(comm, in_values, n, out_values, 0);
+    broadcast(comm, out_values, comm.size() * n, 0);
+  }
+} // end namespace detail
+
+template<typename T>
+inline void
+all_gather(const communicator& comm, const T& in_value, T* out_values)
+{
+  detail::all_gather_impl(comm, &in_value, 1, out_values, is_mpi_datatype<T>());
+}
+
+template<typename T>
+void
+all_gather(const communicator& comm, const T& in_value, 
+           std::vector<T>& out_values)
+{
+  out_values.resize(comm.size());
+  ::boost::mpi::all_gather(comm, &in_value, 1, &out_values[0]);
+}
+
+template<typename T>
+inline void
+all_gather(const communicator& comm, const T* in_values, int n, T* out_values)
+{
+  detail::all_gather_impl(comm, in_values, n, out_values, is_mpi_datatype<T>());
+}
+
+template<typename T>
+void
+all_gather(const communicator& comm, const T* in_values, int n,
+           std::vector<T>& out_values)
+{
+  out_values.resize(comm.size() * n);
+  ::boost::mpi::all_gather(comm, in_values, n, &out_values[0]);
+}
+
+} } // end namespace boost::mpi
+
+#endif // BOOST_MPI_ALL_GATHER_HPP