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// Thyra: Interfaces and Support for Abstract Numerical Algorithms
// Copyright (2004) Sandia Corporation
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#ifndef THYRA_DIAGONAL_LINEAR_OP_BASE_HPP
#define THYRA_DIAGONAL_LINEAR_OP_BASE_HPP
#include "Thyra_LinearOpBase.hpp"
namespace Thyra {
/** \brief Interface class for for diagonal linear operators.
*
* This interface represents a diagonal linear operator <tt>M</tt> of the form:
\verbatim
M = diag(diag)
\endverbatim
*
* where <tt>diag</tt> is a <tt>VectorBase</tt> object.
*
* The operator subclass must implement <tt>apply()</tt> as follows:
*
\verbatim
y = alpha*op(M)*x + beta*y
=>
y(i) = alpha*diag(i)*x(i) + beta*y(i), for i = 0 ... n-1
\endverbatim
*
* where <tt>n = this->domain()->dim()</tt>.
*
* \ingroup Thyra_Op_Vec_extended_interfaces_code_grp
*/
template<class Scalar>
class DiagonalLinearOpBase : virtual public LinearOpBase<Scalar> {
public:
/** @name Pure virtual functions that must be overridden in subclass */
//@{
/** \brief Returns true if the diagonal vector is const-only. */
virtual bool isDiagConst() const = 0;
/** \brief Returns the non-const diagonal vector <tt>diag</tt>.
*
* <b>Preconditions:</b><ul>
* <li>[<tt>getDiag().get()!=NULL</tt>] <tt>isDiagConst()==false</tt>
* </ul>
*
* Note that <tt>*this</tt> is not guaranteed to be fully modified until the
* RCP returned is deleted.
*
* A return value of <tt>return.get()==NULL</tt> indicates that
* <tt>this</tt> is not fully initialized.
*/
virtual Teuchos::RCP<VectorBase<Scalar> > getNonconstDiag() = 0;
/** \brief Returns the const diagonal vector <tt>diag</tt>.
*
* A return value of <tt>return.get()==NULL</tt> indicates that
* <tt>this</tt> is not fully initialized.
*/
virtual Teuchos::RCP<const VectorBase<Scalar> > getDiag() const = 0;
//@}
};
} // end namespace Thyra
#endif // THYRA_DIAGONAL_LINEAR_OP_BASE_HPP
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