eigen_preconditioner.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2023 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library 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 2.1 of the License, or (at your option) any later version.

// This library 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 this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_EIGEN_PRECONDITIONER_H
#define LIBMESH_EIGEN_PRECONDITIONER_H

#include "libmesh/libmesh_config.h"

#ifdef LIBMESH_HAVE_EIGEN

// Local includes
#include "libmesh/preconditioner.h"

namespace libMesh
{

// forward declarations
template <typename T> class SparseMatrix;
template <typename T> class NumericVector;
template <typename T> class ShellMatrix;

template <typename T>
class EigenPreconditioner : public Preconditioner<T>
{
public:
  EigenPreconditioner (const libMesh::Parallel::Communicator & comm_in);

  virtual ~EigenPreconditioner ();

  virtual void apply(const NumericVector<T> & x, NumericVector<T> & y) override;

  virtual void clear () override {}

  virtual void init () override;
};




/*----------------------- inline functions ----------------------------------*/
template <typename T>
inline
EigenPreconditioner<T>::EigenPreconditioner(const libMesh::Parallel::Communicator & comm_in) :
  Preconditioner<T>(comm_in)
{
}



template <typename T>
inline
EigenPreconditioner<T>::~EigenPreconditioner ()
{
  this->clear ();
}

} // namespace libMesh

#endif // #ifdef LIBMESH_HAVE_EIGEN
#endif // LIBMESH_EIGEN_PRECONDITIONER_H