Thyra_MultiVectorAdapterBase_def.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_MULTI_VECTOR_ADAPTER_BASE_DEF_HPP
#define THYRA_MULTI_VECTOR_ADAPTER_BASE_DEF_HPP
 
#include "Thyra_MultiVectorAdapterBase_decl.hpp"
#include "Thyra_ScalarProdVectorSpaceBase.hpp"
#include "Thyra_ScalarProdBase.hpp"
 
 
namespace Thyra {
 
 
// Overridden functions from LinearOp
 
 
template<class Scalar>
RCP<const VectorSpaceBase<Scalar> >
MultiVectorAdapterBase<Scalar>::range() const
{
  return rangeScalarProdVecSpc();
}
 
 
template<class Scalar>
RCP<const VectorSpaceBase<Scalar> >
MultiVectorAdapterBase<Scalar>::domain() const
{
  return domainScalarProdVecSpc();
}
 
 
// Overridden protected functions from LinearOpBase
 
 
template<class Scalar>
bool MultiVectorAdapterBase<Scalar>::opSupportedImpl(EOpTransp M_trans) const
{
  if (ScalarTraits<Scalar>::isComplex)
    return (M_trans == NOTRANS || M_trans == CONJTRANS);
  return true;
}
 
 
template<class Scalar>
void MultiVectorAdapterBase<Scalar>::applyImpl(
  const EOpTransp M_trans,
  const MultiVectorBase<Scalar> &X,
  const Ptr<MultiVectorBase<Scalar> > &Y,
  const Scalar alpha,
  const Scalar beta
  ) const
{
  //
  // Perform:
  //
  //   NOTRANS:    Y = beta*Y + alpha * M * Q_D * X
  //
  //   CONJTRANS:  Y = beta*Y + alpha * M^H * Q_R * X
  //
  // where T = Q_D * X or Q_R * X
  //
  RCP<const ScalarProdVectorSpaceBase<Scalar> > scalarProdVecSpc =
    ( real_trans(M_trans) == NOTRANS
      ? domainScalarProdVecSpc()
      : rangeScalarProdVecSpc() );
  RCP<const ScalarProdBase<Scalar> > scalarProd = scalarProdVecSpc->getScalarProd();
  if (scalarProd->isEuclidean()) {
    // Y = beta*Y + alpha * op(M) * X
    this->euclideanApply(M_trans, X, Y, alpha, beta);
  }
  else {
    // T = Q * X
    RCP<MultiVectorBase<Scalar> > T = createMembers(X.range(), X.domain());
    ::Thyra::apply(*scalarProd->getLinearOp(), NOTRANS, X, T.ptr());
    // Y = beta*Y + alpha * op(M) * T
    this->euclideanApply(M_trans, *T, Y, alpha, beta);
  }
}
 
 
} // namespace Thyra
 
 
#endif // THYRA_MULTI_VECTOR_ADAPTER_BASE_DEF_HPP