/usr/include/dolfin/fem/DofMap.h is in libdolfin-dev 2016.2.0-2.
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//
// This file is part of DOLFIN.
//
// DOLFIN 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 3 of the License, or
// (at your option) any later version.
//
// DOLFIN 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 DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Modified by Martin Alnes, 2008-2015
// Modified by Kent-Andre Mardal, 2009
// Modified by Ola Skavhaug, 2009
// Modified by Joachim B Haga, 2012
// Modified by Mikael Mortensen, 2012
// Modified by Jan Blechta, 2013
#ifndef __DOLFIN_DOF_MAP_H
#define __DOLFIN_DOF_MAP_H
#include <cstdlib>
#include <map>
#include <memory>
#include <unordered_map>
#include <utility>
#include <vector>
#include <ufc.h>
#include <dolfin/common/ArrayView.h>
#include <dolfin/common/types.h>
#include <dolfin/la/IndexMap.h>
#include <dolfin/mesh/Cell.h>
#include "GenericDofMap.h"
namespace dolfin
{
class GenericVector;
/// This class handles the mapping of degrees of freedom. It builds
/// a dof map based on a ufc::dofmap on a specific mesh. It will
/// reorder the dofs when running in parallel. Sub-dofmaps, both
/// views and copies, are supported.
class DofMap : public GenericDofMap
{
public:
/// Create dof map on mesh (mesh is not stored)
///
/// *Arguments*
/// ufc_dofmap (ufc::dofmap)
/// The ufc::dofmap.
/// mesh (_Mesh_)
/// The mesh.
DofMap(std::shared_ptr<const ufc::dofmap> ufc_dofmap,
const Mesh& mesh);
/// Create a periodic dof map on mesh (mesh is not stored)
///
/// *Arguments*
/// ufc_dofmap (ufc::dofmap)
/// The ufc::dofmap.
/// mesh (_Mesh_)
/// The mesh.
/// constrained_boundary (_SubDomain_)
/// The subdomain marking the constrained (tied) boundaries.
DofMap(std::shared_ptr<const ufc::dofmap> ufc_dofmap,
const Mesh& mesh, std::shared_ptr<const SubDomain> constrained_domain);
private:
// Create a sub-dofmap (a view) from parent_dofmap
DofMap(const DofMap& parent_dofmap,
const std::vector<std::size_t>& component,
const Mesh& mesh);
// Create a collapsed dofmap from parent_dofmap
DofMap(std::unordered_map<std::size_t, std::size_t>& collapsed_map,
const DofMap& dofmap_view, const Mesh& mesh);
// Copy constructor
DofMap(const DofMap& dofmap);
public:
/// Destructor
~DofMap();
/// True iff dof map is a view into another map
///
/// *Returns*
/// bool
/// True if the dof map is a sub-dof map (a view into
/// another map).
bool is_view() const
{ return _is_view; }
/// Return the dimension of the global finite element function
/// space
///
/// *Returns*
/// std::size_t
/// The dimension of the global finite element function space.
std::size_t global_dimension() const;
/// Return the dimension of the local finite element function
/// space on a cell
///
/// *Arguments*
/// cell_index (std::size_t)
/// Index of cell
///
/// *Returns*
/// std::size_t
/// Dimension of the local finite element function space.
std::size_t num_element_dofs(std::size_t cell_index) const;
/// Return the maximum dimension of the local finite element
/// function space
///
/// *Returns*
/// std::size_t
/// Maximum dimension of the local finite element function
/// space.
std::size_t max_element_dofs() const;
/// Return the number of dofs for a given entity dimension
///
/// *Arguments*
/// dim (std::size_t)
/// Entity dimension
///
/// *Returns*
/// std::size_t
/// Number of dofs associated with given entity dimension
virtual std::size_t num_entity_dofs(std::size_t dim) const;
/// Return number of facet dofs
///
/// *Returns*
/// std::size_t
/// The number of facet dofs.
std::size_t num_facet_dofs() const;
/// Return the ownership range (dofs in this range are owned by
/// this process)
///
/// *Returns*
/// std::pair<std::size_t, std::size_t>
/// The ownership range.
std::pair<std::size_t, std::size_t> ownership_range() const;
/// Return map from nonlocal dofs that appear in local dof map to
/// owning process
///
/// *Returns*
/// std::vector<unsigned int>
/// The map from non-local dofs.
const std::vector<int>& off_process_owner() const
{ return _index_map->off_process_owner(); }
/// Return map from all shared nodes to the sharing processes (not
/// including the current process) that share it.
///
/// *Returns*
/// std::unordered_map<std::size_t, std::vector<unsigned int>>
/// The map from dofs to list of processes
const std::unordered_map<int, std::vector<int>>& shared_nodes() const;
/// Return set of processes that share dofs with this process
///
/// *Returns*
/// std::set<int>
/// The set of processes
const std::set<int>& neighbours() const;
/// Clear any data required to build sub-dofmaps (this is to
/// reduce memory use)
void clear_sub_map_data()
{
//std::vector<int>().swap(_ufc_local_to_local);
_ufc_local_to_local.clear();
}
/// Local-to-global mapping of dofs on a cell
///
/// *Arguments*
/// cell_index (std::size_t)
/// The cell index.
///
/// *Returns*
/// ArrayView<const dolfin::la_index>
/// Local-to-global mapping of dofs.
ArrayView<const dolfin::la_index> cell_dofs(std::size_t cell_index) const
{
const std::size_t index = cell_index*_cell_dimension;
dolfin_assert(index + _cell_dimension <= _dofmap.size());
return ArrayView<const dolfin::la_index>(_cell_dimension,
&_dofmap[index]);
}
/// Tabulate local-local facet dofs
///
/// *Arguments*
/// dofs (std::size_t)
/// Degrees of freedom.
/// local_facet (std::size_t)
/// The local facet.
void tabulate_facet_dofs(std::vector<std::size_t>& dofs,
std::size_t local_facet) const;
/// Tabulate local-local mapping of dofs on entity (dim, local_entity)
///
/// *Arguments*
/// dofs (std::size_t)
/// Degrees of freedom.
/// dim (std::size_t)
/// The entity dimension
/// local_entity (std::size_t)
/// The local entity index
void tabulate_entity_dofs(std::vector<std::size_t>& dofs,
std::size_t dim, std::size_t local_entity) const;
/// Tabulate globally supported dofs
///
/// *Arguments*
/// dofs (std::size_t)
/// Degrees of freedom.
void tabulate_global_dofs(std::vector<std::size_t>& dofs) const
{
dolfin_assert(_global_nodes.empty() || block_size() == 1);
dofs.resize(_global_nodes.size());
std::copy(_global_nodes.cbegin(), _global_nodes.cend(), dofs.begin());
}
/// Create a copy of the dof map
///
/// *Returns*
/// DofMap
/// The Dofmap copy.
std::shared_ptr<GenericDofMap> copy() const;
/// Create a copy of the dof map on a new mesh
///
/// *Arguments*
/// new_mesh (_Mesh_)
/// The new mesh to create the dof map on.
///
/// *Returns*
/// DofMap
/// The new Dofmap copy.
std::shared_ptr<GenericDofMap> create(const Mesh& new_mesh) const;
/// Extract subdofmap component
///
/// *Arguments*
/// component (std::vector<std::size_t>)
/// The component.
/// mesh (_Mesh_)
/// The mesh.
///
/// *Returns*
/// DofMap
/// The subdofmap component.
std::shared_ptr<GenericDofMap>
extract_sub_dofmap(const std::vector<std::size_t>& component,
const Mesh& mesh) const;
/// Create a "collapsed" dofmap (collapses a sub-dofmap)
///
/// *Arguments*
/// collapsed_map (std::unordered_map<std::size_t, std::size_t>)
/// The "collapsed" map.
/// mesh (_Mesh_)
/// The mesh.
///
/// *Returns*
/// DofMap
/// The collapsed dofmap.
std::shared_ptr<GenericDofMap>
collapse(std::unordered_map<std::size_t, std::size_t>&
collapsed_map, const Mesh& mesh) const;
// FIXME: Document this function properly
/// Return list of dof indices on this process that belong to mesh
/// entities of dimension dim
std::vector<dolfin::la_index> dofs(const Mesh& mesh,
std::size_t dim) const;
// FIXME: Document this function
std::vector<dolfin::la_index> dofs() const;
/// Set dof entries in vector to a specified value. Parallel layout
/// of vector must be consistent with dof map range. This
/// function is typically used to construct the null space of a
/// matrix operator.
///
/// *Arguments*
/// vector (_GenericVector_)
/// The vector to set.
/// value (double)
/// The value to set.
void set(GenericVector& x, double value) const;
/// Return the map (const access)
std::shared_ptr<const IndexMap> index_map() const
{ return _index_map; }
/// Return the block size for dof maps with components, typically
/// used for vector valued functions.
int block_size() const
{ return _index_map->block_size(); }
/// Compute the map from local (this process) dof indices to
/// global dof indices.
///
/// *Arguments*
/// local_to_global_map (_std::vector<std::size_t>_)
/// The local-to-global map to fill.
void tabulate_local_to_global_dofs(std::vector<std::size_t>& local_to_global_map) const;
/// Return global dof index for a given local (process) dof index
///
/// *Arguments*
/// local_index (int)
/// The local local index.
///
/// *Returns*
/// std::size_t
/// The global dof index.
std::size_t local_to_global_index(int local_index) const
{ return _index_map->local_to_global(local_index); }
/// Return indices of dofs which are owned by other processes
const std::vector<std::size_t>& local_to_global_unowned() const
{ return _index_map->local_to_global_unowned(); }
/// Return informal string representation (pretty-print)
///
/// *Arguments*
/// verbose (bool)
/// Flag to turn on additional output.
///
/// *Returns*
/// std::string
/// An informal representation of the function space.
std::string str(bool verbose) const;
private:
// Friends
friend class DofMapBuilder;
// Check dimensional consistency between UFC dofmap and the mesh
static void check_dimensional_consistency(const ufc::dofmap& dofmap,
const Mesh& mesh);
// Check that mesh provides the entities needed by dofmap
static void check_provided_entities(const ufc::dofmap& dofmap,
const Mesh& mesh);
// Cell-local-to-dof map (dofs for cell dofmap[i])
std::vector<dolfin::la_index> _dofmap;
// List of global nodes
std::set<std::size_t> _global_nodes;
// Cell dimension (fixed for all cells)
std::size_t _cell_dimension;
// UFC dof map
std::shared_ptr<const ufc::dofmap> _ufc_dofmap;
// Number global mesh entities. This is usually the same as what
// is reported by the mesh, but will differ for dofmaps
// constrained, e.g. dofmaps with periodic bcs. It is stored in
// order to compute the global dimension of dofmaps that are
// constructed from a sub-dofmap.
std::vector<std::size_t> _num_mesh_entities_global;
// Map from UFC dof numbering to renumbered dof (ufc_dof ->
// actual_dof, both using local indices)
std::vector<int> _ufc_local_to_local;
// Flag to determine if the DofMap is a view
bool _is_view;
// Global dimension. Note that this may differ from the global
// dimension of the UFC dofmap if the function space is periodic.
std::size_t _global_dimension;
// UFC dof map offset
std::size_t _ufc_offset;
// Multimesh dof map offset
std::size_t _multimesh_offset;
// Object containing information about dof distribution across
// processes
std::shared_ptr<IndexMap> _index_map;
// Temporary until MultiMeshDofMap runs in parallel
friend class MultiMeshDofMap;
// List of processes that share a given dof
std::unordered_map<int, std::vector<int>> _shared_nodes;
// Neighbours (processes that we share dofs with)
std::set<int> _neighbours;
};
}
#endif
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