/usr/include/dolfin/fem/FiniteElement.h is in libdolfin-dev 2017.2.0.post0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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/>.
#ifndef __FINITE_ELEMENT_H
#define __FINITE_ELEMENT_H
#include <memory>
#include <vector>
#include <ufc.h>
#include <boost/multi_array.hpp>
#include <dolfin/common/types.h>
#include <dolfin/log/log.h>
namespace dolfin
{
class Cell;
/// This is a wrapper for a UFC finite element (ufc::finite_element).
class FiniteElement
{
public:
/// Create finite element from UFC finite element (data may be shared)
/// @param element (ufc::finite_element)
/// UFC finite element
FiniteElement(std::shared_ptr<const ufc::finite_element> element);
/// Destructor
virtual ~FiniteElement() {}
//--- Direct wrappers for ufc::finite_element ---
/// Return a string identifying the finite element
/// @return std::string
std::string signature() const
{
dolfin_assert(_ufc_element);
return _ufc_element->signature();
}
/// Return the cell shape
/// @return ufc::shape
ufc::shape cell_shape() const
{
dolfin_assert(_ufc_element);
return _ufc_element->cell_shape();
}
/// Return the topological dimension of the cell shape
/// @return std::size_t
std::size_t topological_dimension() const
{
dolfin_assert(_ufc_element);
return _ufc_element->topological_dimension();
}
/// Return the geometric dimension of the cell shape
/// @return unsigned int
virtual unsigned int geometric_dimension() const
{
dolfin_assert(_ufc_element);
return _ufc_element->geometric_dimension();
}
/// Return the dimension of the finite element function space
/// @return std::size_t
std::size_t space_dimension() const
{
dolfin_assert(_ufc_element);
return _ufc_element->space_dimension();
}
/// Return the rank of the value space
std::size_t value_rank() const
{
dolfin_assert(_ufc_element);
return _ufc_element->value_rank();
}
/// Return the dimension of the value space for axis i
std::size_t value_dimension(std::size_t i) const
{
dolfin_assert(_ufc_element);
return _ufc_element->value_dimension(i);
}
/// Evaluate basis function i at given point in cell
void evaluate_basis(std::size_t i, double* values, const double* x,
const double* coordinate_dofs,
int cell_orientation) const
{
dolfin_assert(_ufc_element);
_ufc_element->evaluate_basis(i, values, x, coordinate_dofs,
cell_orientation);
}
/// Evaluate all basis functions at given point in cell
void evaluate_basis_all(double* values,
const double* x,
const double* coordinate_dofs,
int cell_orientation) const
{
dolfin_assert(_ufc_element);
_ufc_element->evaluate_basis_all(values, x, coordinate_dofs,
cell_orientation);
}
/// Evaluate order n derivatives of basis function i at given point in cell
void evaluate_basis_derivatives(unsigned int i,
unsigned int n,
double* values,
const double* x,
const double* coordinate_dofs,
int cell_orientation) const
{
dolfin_assert(_ufc_element);
_ufc_element->evaluate_basis_derivatives(i, n, values, x,
coordinate_dofs,
cell_orientation);
}
/// Evaluate order n derivatives of all basis functions at given
/// point in cell
void evaluate_basis_derivatives_all(unsigned int n,
double* values,
const double* x,
const double* coordinate_dofs,
int cell_orientation) const
{
dolfin_assert(_ufc_element);
_ufc_element->evaluate_basis_derivatives_all(n, values, x,
coordinate_dofs,
cell_orientation);
}
/// Evaluate linear functional for dof i on the function f
double evaluate_dof(std::size_t i,
const ufc::function& function,
const double* coordinate_dofs,
int cell_orientation,
const ufc::cell& c) const
{
dolfin_assert(_ufc_element);
return _ufc_element->evaluate_dof(i, function, coordinate_dofs,
cell_orientation, c);
}
/// Evaluate linear functionals for all dofs on the function f
void evaluate_dofs(double* values,
const ufc::function& f,
const double* coordinate_dofs,
int cell_orientation,
const ufc::cell& c) const
{
dolfin_assert(_ufc_element);
_ufc_element->evaluate_dofs(values, f, coordinate_dofs,
cell_orientation, c);
}
/// Interpolate vertex values from dof values
/// @param vertex_values (double*)
/// @param coefficients (double*)
/// @param coordinate_dofs (const double*)
/// @param cell_orientation (int)
void interpolate_vertex_values(double* vertex_values,
double* coefficients,
const double* coordinate_dofs,
int cell_orientation) const
{
dolfin_assert(_ufc_element);
_ufc_element->interpolate_vertex_values(vertex_values, coefficients,
coordinate_dofs,
cell_orientation);
}
/// Tabulate the coordinates of all dofs on an element
///
/// @param[in,out] coordinates (boost::multi_array<double, 2>)
/// The coordinates of all dofs on a cell.
/// @param[in] coordinate_dofs (std::vector<double>)
/// The cell coordinates
/// @param[in] cell (Cell)
/// The cell.
void tabulate_dof_coordinates(boost::multi_array<double, 2>& coordinates,
const std::vector<double>& coordinate_dofs,
const Cell& cell) const;
/// Return the number of sub elements (for a mixed element)
/// @return std::size_t
/// number of sub-elements
std::size_t num_sub_elements() const
{
dolfin_assert(_ufc_element);
return _ufc_element->num_sub_elements();
}
//--- DOLFIN-specific extensions of the interface ---
/// Return simple hash of the signature string
std::size_t hash() const
{ return _hash; }
/// Create a new finite element for sub element i (for a mixed element)
std::shared_ptr<const FiniteElement>
create_sub_element(std::size_t i) const
{
dolfin_assert(_ufc_element);
std::shared_ptr<const ufc::finite_element>
ufc_element(_ufc_element->create_sub_element(i));
std::shared_ptr<const FiniteElement>
element(new const FiniteElement(ufc_element));
return element;
}
/// Create a new class instance
std::shared_ptr<const FiniteElement> create() const
{
dolfin_assert(_ufc_element);
std::shared_ptr<const ufc::finite_element>
ufc_element(_ufc_element->create());
return std::shared_ptr<const FiniteElement>(new FiniteElement(ufc_element));
}
/// Extract sub finite element for component
std::shared_ptr<const FiniteElement>
extract_sub_element(const std::vector<std::size_t>& component) const;
/// Return underlying UFC element. Intended for libray usage only
/// and may change.
std::shared_ptr<const ufc::finite_element> ufc_element() const
{ return _ufc_element; }
private:
// UFC finite element
std::shared_ptr<const ufc::finite_element> _ufc_element;
// Recursively extract sub finite element
static std::shared_ptr<const FiniteElement>
extract_sub_element(const FiniteElement& finite_element,
const std::vector<std::size_t>& component);
// Simple hash of the signature string
std::size_t _hash;
};
}
#endif
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