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// ***********************************************************************
//
// Thyra: Interfaces and Support for Abstract Numerical Algorithms
// Copyright (2004) Sandia Corporation
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#ifndef THYRA_ADDED_LINEAR_OP_BASE_HPP
#define THYRA_ADDED_LINEAR_OP_BASE_HPP
#include "Thyra_LinearOpBase.hpp"
namespace Thyra {
/** \brief Interface class for implicitly added linear operators.
*
* This interface represents a added linear operator <tt>M</tt> of the form:
\verbatim
M = Op[0] + Op[1] + ... + Op[numOps-1]
\endverbatim
*
* where <tt>Op[]</tt> is an array of <tt>numOps</tt> <tt>LinearOpBase</tt>
* objects. Of course the operator <tt>M</tt> is not constructed explicitly
* but instead just applies the constituent linear operators accordingly using
* temporaries.
*
* In other words, subclasses define <tt>apply()</tt> as:
*
\verbatim
y = alpha*M*x + beta*y
= alpha * ( Op[0] * x + Op[1] * x + ... + Op[numOps-1] * x ) + beta * y
\endverbatim
*
* \ingroup Thyra_Op_Vec_extended_interfaces_code_grp
*/
template<class Scalar>
class AddedLinearOpBase : virtual public LinearOpBase<Scalar> {
public:
/** @name Pure virtual functions that must be overridden by subclasses */
//@{
/** \brief Returns the number of constituent operators.
*
* A return value of <tt>0</tt> indicates that <tt>this</tt> is not fully
* initialized.
*/
virtual int numOps() const = 0;
/** \brief Determine if the <tt>k</tt>th constituent operator is const-only or not.
*
* \param k [in] The zero-based index of the constituent operator to return.
*
* <b>Preconditions:</b><ul>
* <li><tt> 0 <= k < this->numOps()</tt>
* </ul>
*/
virtual bool opIsConst(const int k) const = 0;
/** \brief Return the <tt>k</tt>th non-constant constituent operator.
*
* \param k [in] The zero-based index of the constituent operator to return.
*
* <b>Preconditions:</b><ul>
* <li><tt> 0 <= k < this->numOps()</tt>
* <li><tt>this->opIsConst(k)==false</tt>
* </ul>
*/
virtual Teuchos::RCP<LinearOpBase<Scalar> > getNonconstOp(const int k) = 0;
/** \brief Return the <tt>k</tt>th constant constituent operator.
*
* \param k [in] The zero-based index of the constituent operator to return.
*
* <b>Preconditions:</b><ul>
* <li><tt> 0 <= k < this->numOps()</tt>
* </ul>
*/
virtual Teuchos::RCP<const LinearOpBase<Scalar> > getOp(const int k) const = 0;
//@}
};
} // namespace Thyra
#endif // THYRA_ADDED_LINEAR_OP_BASE_HPP
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