/usr/include/dolfin/la/PETScPreconditioner.h is in libdolfin1.0-dev 1.0.0-1.
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 2011
//
// First added: 2010-02-25
// Last changed: 2011-10-19
#ifndef __DOLFIN_PETSC_PRECONDITIONER_H
#define __DOLFIN_PETSC_PRECONDITIONER_H
#ifdef HAS_PETSC
#include <string>
#include <petscpc.h>
#include <boost/shared_ptr.hpp>
#include <dolfin/common/types.h>
#include <dolfin/common/Variable.h>
#include <dolfin/la/PETScObject.h>
#include <dolfin/parameter/Parameters.h>
namespace dolfin
{
// Forward declarations
class PETScKrylovSolver;
/// This class is a wrapper for configuring PETSc preconditioners. It does
/// not own a preconditioner. It can take a PETScKrylovSolver and set the
/// preconditioner type and parameters.
class PETScPreconditioner : public PETScObject, public Variable
{
public:
/// Create a particular preconditioner object
explicit PETScPreconditioner(std::string type = "default");
/// Destructor
virtual ~PETScPreconditioner();
/// Set the precondtioner type and parameters
virtual void set(PETScKrylovSolver& solver) const;
/// Return informal string representation (pretty-print)
std::string str(bool verbose) const;
// Rerturn a list of available preconditioners
static std::vector<std::pair<std::string, std::string> > preconditioners();
/// Default parameter values
static Parameters default_parameters();
private:
/// Named preconditioner
std::string type;
// Available names preconditioners
static const std::map<std::string, const PCType> _methods;
};
}
#endif
#endif
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