cell_data_transfer.h

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// -----------------------------------------------------------------------------
//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
// Copyright (C) 2019 - 2024 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Detailed license information governing the source code and contributions
// can be found in LICENSE.md and CONTRIBUTING.md at the top level directory.
//
// -----------------------------------------------------------------------------
 
#ifndef dealii_cell_data_transfer_h
#define dealii_cell_data_transfer_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/observer_pointer.h>
 
#include <deal.II/grid/tria.h>
 
#include <deal.II/numerics/adaptation_strategies.h>
 
#include <algorithm>
#include <functional>
#include <set>
 
 
DEAL_II_NAMESPACE_OPEN
 
template <int dim, int spacedim = dim, typename VectorType = Vector<double>>
class CellDataTransfer
{
private:
  using value_type = typename VectorType::value_type;
 
public:
  CellDataTransfer(
    const Triangulation<dim, spacedim> &triangulation,
    const std::function<std::vector<value_type>(
      const typename Triangulation<dim, spacedim>::cell_iterator &parent,
      const value_type parent_value)>   refinement_strategy =
      &AdaptationStrategies::Refinement::preserve<dim, spacedim, value_type>,
    const std::function<value_type(
      const typename Triangulation<dim, spacedim>::cell_iterator &parent,
      const std::vector<value_type> &children_values)> coarsening_strategy =
      &AdaptationStrategies::Coarsening::
        check_equality<dim, spacedim, value_type>);
 
  void
  prepare_for_coarsening_and_refinement();
 
  void
  unpack(const VectorType &in, VectorType &out);
 
private:
  ObserverPointer<const Triangulation<dim, spacedim>,
                  CellDataTransfer<dim, spacedim, VectorType>>
    triangulation;
 
  const std::function<std::vector<value_type>(
    const typename Triangulation<dim, spacedim>::cell_iterator &parent,
    const value_type                                            parent_value)>
    refinement_strategy;
 
  const std::function<value_type(
    const typename Triangulation<dim, spacedim>::cell_iterator &parent,
    const std::vector<value_type> &children_indices)>
    coarsening_strategy;
 
  std::map<const typename Triangulation<dim, spacedim>::cell_iterator,
           const unsigned int>
    persisting_cells_active_index;
 
  std::map<const typename Triangulation<dim, spacedim>::cell_iterator,
           const unsigned int>
    refined_cells_active_index;
 
  std::map<const typename Triangulation<dim, spacedim>::cell_iterator,
           const std::set<unsigned int>>
    coarsened_cells_active_index;
 
  unsigned int n_active_cells_pre;
};
 
 
DEAL_II_NAMESPACE_CLOSE
 
#endif /* dealii_cell_data_transfer_h */