Thyra_DefaultSerialDenseLinearOpWithSolve_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_SERIAL_DENSE_LINEAR_OP_WITH_SOLVE_DECL_HPP
#define THYRA_DEFAULT_SERIAL_DENSE_LINEAR_OP_WITH_SOLVE_DECL_HPP


#include "Thyra_LinearOpWithSolveBase.hpp"
#include "RTOpPack_LapackWrappers.hpp"


namespace Thyra {


/* \brief . */
inline RTOpPack::ETransp convertToRTOpPackETransp( const EOpTransp transp )
{
#ifdef TEUCHOS_DEBUG
  TEUCHOS_TEST_FOR_EXCEPT(transp == CONJ);
#endif
  switch(transp) {
    case NOTRANS:
      return RTOpPack::NOTRANS;
    case TRANS:
      return RTOpPack::TRANS;
    case CONJTRANS:
      return RTOpPack::CONJTRANS;
    default:
      TEUCHOS_TEST_FOR_EXCEPT(true);
  }
  TEUCHOS_UNREACHABLE_RETURN(RTOpPack::NOTRANS);
}
// ToDo: Move the above function into Thyra_OperatorVectorTypes.hpp


template<class Scalar>
class DefaultSerialDenseLinearOpWithSolve
  : virtual public LinearOpWithSolveBase<Scalar>
{
public:
  

  DefaultSerialDenseLinearOpWithSolve();

  void initialize( const RCP<const MultiVectorBase<Scalar> > &M );

  RCP<const LinearOpBase<Scalar> > getFwdOp() const;



  RCP<const VectorSpaceBase<Scalar> > range() const;
  RCP<const VectorSpaceBase<Scalar> > domain() 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;



  bool solveSupportsImpl(EOpTransp M_trans) const;
  bool solveSupportsSolveMeasureTypeImpl(
    EOpTransp M_trans, const SolveMeasureType& solveMeasureType) const;
  SolveStatus<Scalar> solveImpl(
    const EOpTransp transp,
    const MultiVectorBase<Scalar> &B,
    const Ptr<MultiVectorBase<Scalar> > &X,
    const Ptr<const SolveCriteria<Scalar> > solveCriteria
    ) const;


private:

  // /////////////////////////
  // Private data members

  RCP<const MultiVectorBase<Scalar> > M_;
  RTOpPack::ConstSubMultiVectorView<Scalar> LU_;
  Array<int> ipiv_;

  // /////////////////////////
  // Private member functions

  static void factorize(
    const MultiVectorBase<Scalar> &M,
    const Ptr<RTOpPack::ConstSubMultiVectorView<Scalar> > &LU,
    const Ptr<Array<int> > &ipiv
    );

  static void backsolve(
    const RTOpPack::ConstSubMultiVectorView<Scalar> &LU,
    const ArrayView<const int> ipiv,
    const EOpTransp transp,
    const MultiVectorBase<Scalar> &B,
    const Ptr<MultiVectorBase<Scalar> > &X
    );

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

};


template<class Scalar>
RCP<DefaultSerialDenseLinearOpWithSolve<Scalar> >
defaultSerialDenseLinearOpWithSolve()
{
  return Teuchos::rcp(new DefaultSerialDenseLinearOpWithSolve<Scalar>);
}


template<class Scalar>
RCP<DefaultSerialDenseLinearOpWithSolve<Scalar> >
defaultSerialDenseLinearOpWithSolve( const RCP<const MultiVectorBase<Scalar> > &M )
{
  RCP<DefaultSerialDenseLinearOpWithSolve<Scalar> >
    M_lows = Teuchos::rcp(new DefaultSerialDenseLinearOpWithSolve<Scalar>());
  M_lows->initialize(M);  // With throw if singular
  return M_lows;
}


} // end namespace Thyra


#endif  // THYRA_DEFAULT_SERIAL_DENSE_LINEAR_OP_WITH_SOLVE_DECL_HPP