Thyra_DefaultZeroLinearOp_decl.hpp

// @HEADER
// *****************************************************************************
//    Thyra: Interfaces and Support for Abstract Numerical Algorithms
//
// Copyright 2004 NTESS and the Thyra contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef THYRA_DEFAULT_ZERO_LINEAR_OP_DECL_HPP
#define THYRA_DEFAULT_ZERO_LINEAR_OP_DECL_HPP

#include "Thyra_ZeroLinearOpBase.hpp"
#include "Thyra_RowStatLinearOpBase.hpp"
#include "Thyra_ScaledLinearOpBase.hpp"
#include "Teuchos_ConstNonconstObjectContainer.hpp"


namespace Thyra {


template<class Scalar>
class DefaultZeroLinearOp 
  : virtual public ZeroLinearOpBase<Scalar>
  , virtual public RowStatLinearOpBase<Scalar>
  , virtual public ScaledLinearOpBase<Scalar>
{
public:


  DefaultZeroLinearOp();

  DefaultZeroLinearOp(
    const RCP<const VectorSpaceBase<Scalar> > &range,
    const RCP<const VectorSpaceBase<Scalar> > &domain
    );

  void initialize(
    const RCP<const VectorSpaceBase<Scalar> > &range,
    const RCP<const VectorSpaceBase<Scalar> > &domain
    );

  void uninitialize();


  
  RCP< const VectorSpaceBase<Scalar> > range() const;
  
  RCP< const VectorSpaceBase<Scalar> > domain() const;
  
  RCP<const LinearOpBase<Scalar> > clone() const;
  
  
                                                
  std::string description() const;


protected:


  bool opSupportedImpl(EOpTransp M_trans) const;

  void applyImpl(
    const EOpTransp M_trans,
    const MultiVectorBase<Scalar> &X,
    const Ptr<MultiVectorBase<Scalar> > &Y,
    const Scalar alpha,
    const Scalar beta
    ) const;



  virtual bool rowStatIsSupportedImpl(
    const RowStatLinearOpBaseUtils::ERowStat rowStat) const;
  
  virtual void getRowStatImpl(
    const RowStatLinearOpBaseUtils::ERowStat rowStat, 
    const Teuchos::Ptr<VectorBase< Scalar> > &rowStatVec) const;



  virtual bool supportsScaleLeftImpl() const
  { return true; }

  virtual bool supportsScaleRightImpl() const
  { return true; }
  // Meaningless operation
  virtual void scaleLeftImpl(const VectorBase< Scalar > &/* row_scaling */)
  { }
 // Meaningless operation
  virtual void scaleRightImpl(const VectorBase< Scalar > &/* col_scaling */)
  { }


private:

  RCP<const VectorSpaceBase<Scalar> > range_;
  RCP<const VectorSpaceBase<Scalar> > domain_;

  // Not defined and not to be called
  DefaultZeroLinearOp(const DefaultZeroLinearOp&);
  DefaultZeroLinearOp& operator=(const DefaultZeroLinearOp&);

};


template<class Scalar>
RCP<const LinearOpBase<Scalar> >
zero(
  const RCP<const VectorSpaceBase<Scalar> > &range,
  const RCP<const VectorSpaceBase<Scalar> > &domain
  );

template<class Scalar>
RCP<LinearOpBase<Scalar> >
nonconstZero(
  const RCP<const VectorSpaceBase<Scalar> > &range,
  const RCP<const VectorSpaceBase<Scalar> > &domain
  );


} // end namespace Thyra


#endif  // THYRA_DEFAULT_ZERO_LINEAR_OP_DECL_HPP