parallel_hilbert.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2014 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


#ifndef LIBMESH_PARALLEL_HILBERT_H
#define LIBMESH_PARALLEL_HILBERT_H

// This class contains all the functionality for bin sorting
// Templated on the type of keys you will be sorting and the
// type of iterator you will be using.

#include "libmesh/libmesh_config.h"

#if defined(LIBMESH_HAVE_LIBHILBERT) && defined(LIBMESH_HAVE_MPI)

// Local includes
#include "hilbert.h"
#include "libmesh/parallel.h"

// C++ includes
#include <cstddef>

namespace libMesh {
namespace Parallel {
// A StandardType<> specialization to return a derived MPI datatype
// to handle communication of HilbertIndices.  We use a singleton
// pattern here because a global variable would have tried to call
// MPI functions before MPI got initialized.
template <>
class StandardType<Hilbert::HilbertIndices> : public DataType
{
public:
  explicit
  StandardType(const Hilbert::HilbertIndices* =NULL) {
    // _static_type never gets freed, but it only gets committed once
    // so it's not a *huge* memory leak...
    static DataType _static_type;
    static bool _is_initialized = false;
    if (!_is_initialized)
      {
        _static_type = DataType(Parallel::StandardType<Hilbert::inttype>(), 3);
        _is_initialized = true;
      }
    _datatype = _static_type;
  }
};
} // namespace Parallel
} // namespace libMesh

#endif // LIBMESH_HAVE_LIBHILBERT && LIBMESH_HAVE_MPI

#endif // LIBMESH_PARALLEL_HILBERT_H