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+// Copyright (C) 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)
+
+/** @file datatype_fwd.hpp
+ *
+ *  This header provides forward declarations for the contents of the
+ *  header @c datatype.hpp. It is expected to be used primarily by
+ *  user-defined C++ classes that need to specialize @c
+ *  is_mpi_datatype.
+ */
+#ifndef BOOST_MPI_DATATYPE_FWD_HPP
+#define BOOST_MPI_DATATYPE_FWD_HPP
+
+#include <boost/mpi/config.hpp>
+
+namespace boost { namespace mpi {
+
+template<typename T> struct is_mpi_builtin_datatype;
+template<typename T> struct is_mpi_integer_datatype;
+template<typename T> struct is_mpi_floating_point_datatype;
+template<typename T> struct is_mpi_logical_datatype;
+template<typename T> struct is_mpi_complex_datatype;
+template<typename T> struct is_mpi_byte_datatype;
+template<typename T> struct is_mpi_datatype;
+template<typename T> MPI_Datatype get_mpi_datatype(const T& x);
+template<typename T> MPI_Datatype get_mpi_datatype() 
+                                  { return get_mpi_datatype(T());}
+
+/// a dummy data type giving MPI_PACKED as its MPI_Datatype
+struct packed {};
+} } // end namespace boost::mpi
+
+#endif // BOOST_MPI_MPI_DATATYPE_FWD_HPP