trilinos_preconditioner.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 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_TRILINOS_PRECONDITIONER_H
#define LIBMESH_TRILINOS_PRECONDITIONER_H
 
#include "libmesh/libmesh_config.h"
 
#ifdef LIBMESH_TRILINOS_HAVE_EPETRA
 
// Local includes
#include "libmesh/preconditioner.h"
#include "libmesh/libmesh_common.h"
#include "libmesh/reference_counted_object.h"
#include "libmesh/libmesh.h"
 
// Trilinos includes.  Ignore many unused parameter warnings coming
// from these headers.
#include "libmesh/ignore_warnings.h"
#include "Epetra_Operator.h"
#include "Epetra_FECrsMatrix.h"
#include "Teuchos_ParameterList.hpp"
#include "libmesh/restore_warnings.h"
 
// C++ includes
#include <cstddef>
 
namespace libMesh
{
 
// forward declarations
template <typename T> class SparseMatrix;
template <typename T> class NumericVector;
template <typename T> class ShellMatrix;
enum PreconditionerType : int;
 
template <typename T>
class TrilinosPreconditioner :
    public Preconditioner<T>,
    public Epetra_Operator
{
public:
 
  TrilinosPreconditioner (const libMesh::Parallel::Communicator & comm);
 
  virtual ~TrilinosPreconditioner ();
 
  virtual void apply(const NumericVector<T> & x, NumericVector<T> & y) override;
 
  virtual void clear () override {}
 
  virtual void init () override;
 
  void set_params(Teuchos::ParameterList & list);
 
  Epetra_FECrsMatrix * mat() { return _mat; }
 
  void set_preconditioner_type (const PreconditionerType & preconditioner_type);
 
  void compute();
 
protected:
 
  Epetra_Operator * _prec;
 
  Epetra_FECrsMatrix * _mat;
 
  Teuchos::ParameterList _param_list;
 
  // Epetra_Operator interface
  virtual int SetUseTranspose(bool UseTranspose) override;
  virtual int Apply(const Epetra_MultiVector & X, Epetra_MultiVector & Y) const override;
  virtual int ApplyInverse(const Epetra_MultiVector & r, Epetra_MultiVector & z) const override;
  virtual double NormInf() const override;
  virtual const char * Label() const override;
  virtual bool UseTranspose() const override;
  virtual bool HasNormInf() const override;
  virtual const Epetra_Comm & Comm() const override;
  virtual const Epetra_Map & OperatorDomainMap() const override;
  virtual const Epetra_Map & OperatorRangeMap() const override;
};
 
 
 
 
/*----------------------- inline functions ----------------------------------*/
template <typename T>
inline
TrilinosPreconditioner<T>::TrilinosPreconditioner (const libMesh::Parallel::Communicator & comm) :
  Preconditioner<T>(comm),
  _prec(nullptr),
  _mat(nullptr)
{
}
 
 
 
template <typename T>
inline
TrilinosPreconditioner<T>::~TrilinosPreconditioner ()
{
  this->clear ();
}
 
} // namespace libMesh
 
#endif // LIBMESH_TRILINOS_HAVE_EPETRA
#endif // LIBMESH_TRILINOS_PRECONDITIONER_H