Reference documentation for deal.II version Git fe553f7db3 20201203 08:11:48 +0100

#include <deal.II/dofs/dof_levels.h>
Public Member Functions  
const types::global_dof_index *  get_cell_cache_start (const unsigned int obj_index, const unsigned int dofs_per_cell) const 
std::size_t  memory_consumption () const 
template<class Archive >  
void  serialize (Archive &ar, const unsigned int version) 
Public Attributes  
std::vector< types::global_dof_index >  cell_dof_indices_cache 
DoFObjects< dim >  dof_object 
Structure for storing degree of freedom information for cells, organized by levels.
We store are cached values for the DoF indices on each cell in::cell_dof_indices_cache, since this is a frequently requested operation. The values are set by DoFCellAccessor::update_cell_dof_indices_cache and are used by DoFCellAccessor::get_dof_indices.
Note that vertices are separate from, and in fact have nothing to do with cells. The indices of degrees of freedom located on vertices therefore are not stored here, but rather in member variables of the DoFHandler class.
The indices of degrees of freedom located on lower dimensional objects, i.e. on lines for 2D and on quads and lines for 3D are treated similarly than that on cells. However, these geometrical objects, which are called faces as a generalization, are not organised in a hierarchical structure of levels. Therefore, the degrees of freedom located on these objects are stored in separate classes, namely the DoFFaces
classes.
Access to this object is usually through the DoFAccessor::set_dof_index() and DoFAccessor::dof_index() functions or similar functions of derived classes that in turn access the member variables using the DoFHandler::get_dof_index() and corresponding setter functions. Knowledge of the actual data format is therefore encapsulated to the present hierarchy of classes as well as the DoFHandler class.
Definition at line 69 of file dof_levels.h.

inline 
Return a pointer to the beginning of the DoF indices cache for a given cell.
obj_index  The number of the cell we are looking at. 
dofs_per_cell  The number of DoFs per cell for this cell. 
Definition at line 116 of file dof_levels.h.

inline 
Determine an estimate for the memory consumption (in bytes) of this object.
Definition at line 130 of file dof_levels.h.

inline 
Read or write the data of this object to or from a stream for the purpose of serialization
Definition at line 140 of file dof_levels.h.
std::vector<types::global_dof_index> internal::DoFHandlerImplementation::DoFLevel< dim >::cell_dof_indices_cache 
Cache for the DoF indices on cells. The size of this array equals the number of cells on a given level times selected_fe.n_dofs_per_cell().
Definition at line 76 of file dof_levels.h.
DoFObjects<dim> internal::DoFHandlerImplementation::DoFLevel< dim >::dof_object 
The object containing dofindices and related accessfunctions
Definition at line 81 of file dof_levels.h.