Ifpack2_IdentitySolver_decl.hpp

// @HEADER
// *****************************************************************************
//       Ifpack2: Templated Object-Oriented Algebraic Preconditioner Package
//
// Copyright 2009 NTESS and the Ifpack2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef IFPACK2_IDENTITY_SOLVER_DECL_HPP
#define IFPACK2_IDENTITY_SOLVER_DECL_HPP

#include "Ifpack2_Preconditioner.hpp"
#include "Ifpack2_Details_CanChangeMatrix.hpp"
#include "Tpetra_Export_fwd.hpp"
#include <type_traits>

namespace Ifpack2 {

template<class MatrixType>
class IdentitySolver :
    virtual public Ifpack2::Preconditioner<typename MatrixType::scalar_type,
                                           typename MatrixType::local_ordinal_type,
                                           typename MatrixType::global_ordinal_type,
                                           typename MatrixType::node_type>,
    virtual public Ifpack2::Details::CanChangeMatrix<Tpetra::RowMatrix<typename MatrixType::scalar_type,
                                                                       typename MatrixType::local_ordinal_type,
                                                                       typename MatrixType::global_ordinal_type,
                                                                       typename MatrixType::node_type> >
{
public:
  typedef typename MatrixType::scalar_type                                scalar_type;
  typedef typename MatrixType::local_ordinal_type                         local_ordinal_type;
  typedef typename MatrixType::global_ordinal_type                        global_ordinal_type;
  typedef typename MatrixType::node_type                                  node_type;

  typedef typename Teuchos::ScalarTraits<scalar_type>::magnitudeType      magnitude_type;
  typedef Tpetra::Map<local_ordinal_type, global_ordinal_type, node_type> map_type;
  typedef Tpetra::RowMatrix<scalar_type, local_ordinal_type,
                            global_ordinal_type, node_type> row_matrix_type;

  static_assert(std::is_same<MatrixType, row_matrix_type>::value, "Ifpack2::IdentitySolver: The template parameter MatrixType must be a Tpetra::RowMatrix specialization.  Please don't use Tpetra::CrsMatrix (a subclass of Tpetra::RowMatrix) here anymore.  The constructor can take either a RowMatrix or a CrsMatrix just fine.");

  IdentitySolver (const Teuchos::RCP<const row_matrix_type>& A);

  virtual ~IdentitySolver();

  void setParameters (const Teuchos::ParameterList& params);

  void initialize();

  inline bool isInitialized() const {
    return(isInitialized_);
  }

  void compute();

  inline bool isComputed() const {
    return(isComputed_);
  }



  void
  apply (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& X,
         Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& Y,
         Teuchos::ETransp mode = Teuchos::NO_TRANS,
         scalar_type alpha = Teuchos::ScalarTraits<scalar_type>::one(),
         scalar_type beta = Teuchos::ScalarTraits<scalar_type>::zero()) const;

  Teuchos::RCP<const map_type> getDomainMap () const;

  Teuchos::RCP<const map_type> getRangeMap () const;

  void
  applyMat (const Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& X,
            Tpetra::MultiVector<scalar_type,local_ordinal_type,global_ordinal_type,node_type>& Y,
            Teuchos::ETransp mode = Teuchos::NO_TRANS) const;

  Teuchos::RCP<const Teuchos::Comm<int> > getComm () const;

  Teuchos::RCP<const row_matrix_type> getMatrix () const {
    return matrix_;
  }

  double getComputeFlops() const;

  double getApplyFlops() const;

  int getNumInitialize() const;

  int getNumCompute() const;

  int getNumApply() const;

  double getInitializeTime() const;

  double getComputeTime() const;

  double getApplyTime() const;



  std::string description() const;

  void describe(Teuchos::FancyOStream &out, const Teuchos::EVerbosityLevel verbLevel=Teuchos::Describable::verbLevel_default) const;

  virtual void setMatrix (const Teuchos::RCP<const row_matrix_type>& A);


private:
  typedef Tpetra::Export<local_ordinal_type, global_ordinal_type, node_type> export_type;

  Teuchos::RCP<const row_matrix_type> matrix_;

  Teuchos::RCP<const export_type> export_;

  bool isInitialized_;
  bool isComputed_;

  mutable int numInitialize_;
  mutable int numCompute_;
  mutable int numApply_;

  double initializeTime_;
  double computeTime_;
  double applyTime_;
};

}//namespace Ifpack2

#endif