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+// (C) Copyright 2005 Matthias Troyer
+
+// 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: Matthias Troyer
+
+#ifndef BOOST_MPI_DETAIL_MPI_DATATYPE_OARCHIVE_HPP
+#define BOOST_MPI_DETAIL_MPI_DATATYPE_OARCHIVE_HPP
+
+#include <boost/type_traits/is_enum.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/archive/detail/oserializer.hpp>
+#include <boost/archive/detail/auto_link_archive.hpp>
+#include <boost/archive/basic_archive.hpp>
+#include <boost/mpi/detail/ignore_skeleton_oarchive.hpp>
+#include <boost/mpi/detail/mpi_datatype_primitive.hpp>
+#include <boost/mpi/datatype_fwd.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/integer.hpp>
+#include <boost/archive/detail/register_archive.hpp>
+
+namespace boost { namespace mpi { namespace detail {
+
+
+// an archive wrapper that stores only the data members but not the
+// special types defined by the serialization library
+// to define the data skeletons (classes, pointers, container sizes, ...)
+
+class mpi_datatype_oarchive
+  : public mpi_datatype_primitive,
+    public ignore_skeleton_oarchive<mpi_datatype_oarchive>
+{
+public:
+    template <class T>
+    mpi_datatype_oarchive(const T& x)
+         :  mpi_datatype_primitive(&x) // register address
+        {
+          BOOST_MPL_ASSERT((is_mpi_datatype<T>));
+          *this << x;                   // serialize the object
+        }
+
+    template<class T>
+    void save_override(T const& t)
+    {
+      save_enum(t,boost::is_enum<T>());
+    }
+
+    template<class T>
+    void save_enum(T const& t, mpl::false_)
+    {
+      ignore_skeleton_oarchive<mpi_datatype_oarchive>::save_override(t);
+    }
+
+    template<class T>
+    void save_enum(T const& t, mpl::true_)
+    {
+      // select the right sized integer for the enum
+      typedef typename boost::uint_t<8*sizeof(T)>::least int_type;
+      BOOST_STATIC_ASSERT((sizeof(T)==sizeof(int_type)));
+      this->save(*reinterpret_cast<int_type const*>(&t));
+    }
+
+};
+
+} } } // end namespace boost::mpi::detail
+
+// required by export
+BOOST_SERIALIZATION_REGISTER_ARCHIVE(boost::mpi::detail::mpi_datatype_oarchive)
+BOOST_SERIALIZATION_REGISTER_ARCHIVE(boost::mpi::detail::ignore_skeleton_oarchive<boost::mpi::detail::mpi_datatype_oarchive>)
+BOOST_SERIALIZATION_USE_ARRAY_OPTIMIZATION(boost::mpi::detail::mpi_datatype_oarchive)
+
+#endif // BOOST_MPI_DETAIL_MPI_DATATYPE_OARCHIVE_HPP