text: // 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 {};
  } // namespace mpi
  } // namespace boost
  
  #endif // BOOST_MPI_MPI_DATATYPE_FWD_HPP
  