DofMap.h

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// Copyright (C) 2007-2020 Anders Logg and Garth N. Wells
//
// This file is part of DOLFINx (https://www.fenicsproject.org)
//
// SPDX-License-Identifier:    LGPL-3.0-or-later
 
 
#pragma once
 
#include "ElementDofLayout.h"
#include <cstdlib>
#include <dolfinx/common/MPI.h>
#include <dolfinx/graph/AdjacencyList.h>
#include <dolfinx/graph/ordering.h>
#include <functional>
#include <memory>
#include <mpi.h>
#include <span>
#include <utility>
#include <vector>
 
namespace dolfinx::common
{
class IndexMap;
}
 
namespace dolfinx::mesh
{
class Topology;
}
 
namespace dolfinx::fem
{
 
graph::AdjacencyList<std::int32_t>
transpose_dofmap(const graph::AdjacencyList<std::int32_t>& dofmap,
                 std::int32_t num_cells);
 
//
class DofMap
{
public:
  //
  template <typename E, typename U,
            typename = std::enable_if_t<std::is_same<
                graph::AdjacencyList<std::int32_t>, std::decay_t<U>>::value>>
  DofMap(E&& element, std::shared_ptr<const common::IndexMap> index_map,
         int index_map_bs, U&& dofmap, int bs)
      : index_map(index_map), _index_map_bs(index_map_bs),
        _element_dof_layout(std::forward<E>(element)),
        _dofmap(std::forward<U>(dofmap)), _bs(bs)
  {
    // Do nothing
  }
 
  // Copy constructor
  DofMap(const DofMap& dofmap) = delete;
 
  DofMap(DofMap&& dofmap) = default;
 
  // Destructor
  virtual ~DofMap() = default;
 
  // Copy assignment
  DofMap& operator=(const DofMap& dofmap) = delete;
 
  DofMap& operator=(DofMap&& dofmap) = default;
 
  bool operator==(const DofMap& map) const;
 
  std::span<const std::int32_t> cell_dofs(int cell) const
  {
    return _dofmap.links(cell);
  }
 
  int bs() const noexcept;
 
  DofMap extract_sub_dofmap(const std::vector<int>& component) const;
 
  std::pair<DofMap, std::vector<std::int32_t>> collapse(
      MPI_Comm comm, const mesh::Topology& topology,
      const std::function<std::vector<int>(
          const graph::AdjacencyList<std::int32_t>&)>& reorder_fn
      = [](const graph::AdjacencyList<std::int32_t>& g)
      { return graph::reorder_gps(g); }) const;
 
  const graph::AdjacencyList<std::int32_t>& list() const;
 
  const ElementDofLayout& element_dof_layout() const
  {
    return _element_dof_layout;
  }
 
  std::shared_ptr<const common::IndexMap> index_map;
 
  int index_map_bs() const;
 
private:
  // Block size for the IndexMap
  int _index_map_bs = -1;
 
  // Layout of dofs on a cell
  ElementDofLayout _element_dof_layout;
 
  // Cell-local-to-dof map (dofs for cell dofmap[cell])
  graph::AdjacencyList<std::int32_t> _dofmap;
 
  // Block size for the dofmap
  int _bs = -1;
};
} // namespace dolfinx::fem