/usr/include/dolfin/fem/SystemAssembler.h is in libdolfin-dev 1.4.0+dfsg-4.
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/>.
//
// Modified by Anders Logg 2008-2011
//
// First added: 2009-06-22
// Last changed: 2013-04-23
#ifndef __SYSTEM_ASSEMBLER_H
#define __SYSTEM_ASSEMBLER_H
#include <map>
#include <vector>
#include <boost/array.hpp>
#include <memory>
#include "DirichletBC.h"
#include "AssemblerBase.h"
namespace ufc
{
class cell_integral;
}
namespace dolfin
{
// Forward declarations
class Cell;
class Facet;
class Form;
class GenericMatrix;
class GenericVector;
template<typename T> class MeshFunction;
class UFC;
/// This class provides an assembler for systems of the form
/// Ax = b. It differs from the default DOLFIN assembler in that it
/// applies boundary conditions at the time of assembly, which
/// preserves any symmetries in A.
class SystemAssembler : public AssemblerBase
{
public:
/// Constructor
SystemAssembler(const Form& a, const Form& L);
/// Constructor
SystemAssembler(const Form& a, const Form& L, const DirichletBC& bc);
/// Constructor
SystemAssembler(const Form& a, const Form& L,
const std::vector<const DirichletBC*> bcs);
/// Constructor
SystemAssembler(std::shared_ptr<const Form> a,
std::shared_ptr<const Form> L);
/// Constructor
SystemAssembler(std::shared_ptr<const Form> a,
std::shared_ptr<const Form> L,
const DirichletBC& bc);
/// Constructor
SystemAssembler(std::shared_ptr<const Form> a,
std::shared_ptr<const Form> L,
const std::vector<const DirichletBC*> bcs);
/// Assemble system (A, b)
void assemble(GenericMatrix& A, GenericVector& b);
/// Assemble matrix A
void assemble(GenericMatrix& A);
/// Assemble vector b
void assemble(GenericVector& b);
/// Assemble system (A, b) for (negative) increment dx, where
/// x = x0 - dx is solution to system a == -L subject to bcs.
/// Suitable for use inside a (quasi-)Newton solver.
void assemble(GenericMatrix& A, GenericVector& b, const GenericVector& x0);
/// Assemble rhs vector b for (negative) increment dx, where
/// x = x0 - dx is solution to system a == -L subject to bcs.
/// Suitable for use inside a (quasi-)Newton solver.
void assemble(GenericVector& b, const GenericVector& x0);
private:
// Check form arity
static void check_arity(std::shared_ptr<const Form> a,
std::shared_ptr<const Form> L);
// Assemble system
void assemble(GenericMatrix* A, GenericVector* b,
const GenericVector* x0);
// Bilinear and linear forms
std::shared_ptr<const Form> _a, _l;
// Boundary conditions
std::vector<const DirichletBC*> _bcs;
class Scratch;
static void
cell_wise_assembly(boost::array<GenericTensor*, 2>& tensors,
boost::array<UFC*, 2>& ufc,
Scratch& data,
const DirichletBC::Map& boundary_values,
const MeshFunction<std::size_t>* cell_domains,
const MeshFunction<std::size_t>* exterior_facet_domains);
static void
facet_wise_assembly(boost::array<GenericTensor*, 2>& tensors,
boost::array<UFC*, 2>& ufc,
Scratch& data,
const DirichletBC::Map& boundary_values,
const MeshFunction<std::size_t>* cell_domains,
const MeshFunction<std::size_t>* exterior_facet_domains,
const MeshFunction<std::size_t>* interior_facet_domains);
static void apply_bc(double* A, double* b,
const DirichletBC::Map& boundary_values,
const std::vector<dolfin::la_index>& global_dofs0,
const std::vector<dolfin::la_index>& global_dofs1);
// Return true if cell has an Dirichlet/essential boundary
// condition applied
static bool has_bc(const DirichletBC::Map& boundary_values,
const std::vector<dolfin::la_index>& dofs);
// Return true if element matrix is required
static bool cell_matrix_required(const GenericTensor* A,
const void* integral,
const DirichletBC::Map& boundary_values,
const std::vector<dolfin::la_index>& dofs);
// Class to hold temporary data
class Scratch
{
public:
Scratch(const Form& a, const Form& L);
~Scratch();
void zero_cell();
boost::array<std::vector<double>, 2> Ae;
};
};
}
#endif
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