Thyra_DefaultIdentityLinearOp.hpp

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//    Thyra: Interfaces and Support for Abstract Numerical Algorithms
//                 Copyright (2004) Sandia Corporation
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#ifndef THYRA_DEFAULT_IDENTITY_LINEAR_OP_HPP
#define THYRA_DEFAULT_IDENTITY_LINEAR_OP_HPP

#include "Thyra_DefaultIdentityLinearOpDecl.hpp"
#include "Thyra_MultiVectorStdOps.hpp"
#include "Teuchos_arrayArg.hpp"

namespace Thyra {

// Constructors/initializers/accessors

template<class Scalar>
DefaultIdentityLinearOp<Scalar>::DefaultIdentityLinearOp()
{}

template<class Scalar>
DefaultIdentityLinearOp<Scalar>::DefaultIdentityLinearOp(
  const Teuchos::RefCountPtr<const VectorSpaceBase<Scalar> >   &space
  )
{
  initialize(space);
}

template<class Scalar>
void DefaultIdentityLinearOp<Scalar>::initialize(
  const Teuchos::RefCountPtr<const VectorSpaceBase<Scalar> >   &space
  )
{
  space_ = space.assert_not_null();
}

template<class Scalar>
void DefaultIdentityLinearOp<Scalar>::uninitialize()
{
  space_ = Teuchos::null;
}

// Overridden from LinearOpBase
  
template<class Scalar>
Teuchos::RefCountPtr< const VectorSpaceBase<Scalar> >
DefaultIdentityLinearOp<Scalar>::range() const
{
  return space_;
}

template<class Scalar>
Teuchos::RefCountPtr< const VectorSpaceBase<Scalar> >
DefaultIdentityLinearOp<Scalar>::domain() const
{
  return space_;
}
  
template<class Scalar>
Teuchos::RefCountPtr<const LinearOpBase<Scalar> >
DefaultIdentityLinearOp<Scalar>::clone() const
{
  typedef DefaultIdentityLinearOp<Scalar> this_t;
  if(space_.get())
    return Teuchos::rcp(new this_t(space_));
  return Teuchos::rcp(new this_t());
}
  
// Overridden from Teuchos::Describable

template<class Scalar>
std::string DefaultIdentityLinearOp<Scalar>::description() const
{
  typedef Teuchos::ScalarTraits<Scalar>  ST;
  std::ostringstream oss;
  oss
    << "Thyra::DefaultIdentityLinearOp<" << ST::name() << ">{"
    << "space="<<(space_.get()?space_->description():"NULL")
    << "}";
  return oss.str();
}

// protected

// Overridden from SingleScalarLinearOpBase

template<class Scalar>
bool DefaultIdentityLinearOp<Scalar>::opSupported(ETransp M_trans) const
{
  return true;
}

template<class Scalar>
void DefaultIdentityLinearOp<Scalar>::apply(
  const ETransp                     M_trans
  ,const MultiVectorBase<Scalar>    &X
  ,MultiVectorBase<Scalar>          *Y
  ,const Scalar                     alpha
  ,const Scalar                     beta
  ) const
{
  using Teuchos::arrayArg;
#ifdef TEUCHOS_DEBUG
  THYRA_ASSERT_LINEAR_OP_MULTIVEC_APPLY_SPACES(
    "DefaultIdentityLinearOp<Scalar>::apply(...)",*this,M_trans,X,Y
    );
#endif // TEUCHOS_DEBUG  
  Thyra::linear_combination<Scalar>(
    1,arrayArg<Scalar>(alpha),arrayArg<const MultiVectorBase<Scalar>*>(&X)()
    ,beta,Y
    );
}

} // end namespace Thyra

template<class Scalar>
Teuchos::RefCountPtr<const Thyra::LinearOpBase<Scalar> >
Thyra::identity(
  const Teuchos::RefCountPtr<const VectorSpaceBase<Scalar> >   &space
  )
{
  return Teuchos::rcp(new DefaultIdentityLinearOp<Scalar>(space));
}

#endif  // THYRA_DEFAULT_IDENTITY_LINEAR_OP_HPP

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