number_cache.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 1998 - 2019 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------

#ifndef dealii_number_cache_h
#define dealii_number_cache_h

#include <deal.II/base/config.h>

#include <deal.II/base/index_set.h>
#include <deal.II/base/mpi.h>

#include <vector>


DEAL_II_NAMESPACE_OPEN

namespace internal
{
  namespace DoFHandlerImplementation
  {
    struct NumberCache
    {
      NumberCache();

      NumberCache(const NumberCache &) = default;

      NumberCache(NumberCache &&) = default;

      NumberCache(const types::global_dof_index n_global_dofs);


      NumberCache(const std::vector<IndexSet> &locally_owned_dofs_per_processor,
                  const unsigned int           my_rank);

      NumberCache &
      operator=(const NumberCache &) = default;

      NumberCache &
      operator=(NumberCache &&) = default;

      std::size_t
      memory_consumption() const;

      void
      clear();

      std::vector<types::global_dof_index>
      get_n_locally_owned_dofs_per_processor(
        const MPI_Comm mpi_communicator) const;

      std::vector<IndexSet>
      get_locally_owned_dofs_per_processor(
        const MPI_Comm mpi_communicator) const;

      types::global_dof_index n_global_dofs;

      types::global_dof_index n_locally_owned_dofs;

      IndexSet locally_owned_dofs;

      std::vector<types::global_dof_index> n_locally_owned_dofs_per_processor;

      std::vector<IndexSet> locally_owned_dofs_per_processor;

      template <class Archive>
      void
      serialize(Archive &ar, const unsigned int version);
    };


    template <class Archive>
    void
    NumberCache::serialize(Archive &ar, const unsigned int /*version*/)
    {
      ar &n_global_dofs &n_locally_owned_dofs;
      ar &               locally_owned_dofs;
      ar &               n_locally_owned_dofs_per_processor;
      ar &               locally_owned_dofs_per_processor;
    }

  } // namespace DoFHandlerImplementation
} // namespace internal


DEAL_II_NAMESPACE_CLOSE

#endif // dealii_dof_iterator_selector_h