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// ***********************************************************************
//
// Thyra: Interfaces and Support for Abstract Numerical Algorithms
// Copyright (2004) Sandia Corporation
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#ifndef THYRA_GET_EPETRA_OPERATOR_HPP
#define THYRA_GET_EPETRA_OPERATOR_HPP
#include "Thyra_EpetraTypes.hpp"
#include "Teuchos_TestForException.hpp"
#include "Teuchos_TypeNameTraits.hpp"
#include <stdexcept> // std::invalid_argument
namespace Thyra {
/** \brief Get smart pointer to non-<tt>const</tt>
* <tt>Epetra_Operator</tt> object from reference to a
* non-<tt>const</tt> <tt>EpetraLinearOp</tt> accessed through its
* <tt>LinearOpBase</tt> interface.
*
* \param op [in] Reference to operator to extract <tt>Epetra_Operator</tt>
* out of.
*
* Preconditions:<ul>
* <li><tt>dynamic_cast<EpetraLinearOp*>(&op) != NULL</tt>
* </ul>
*
* This function is designed to provide an easy way for non-C++ experts
* to get at the <tt>Epetra_Operator</tt> object that was stuck into
* an <tt>EpetraLinearOp</tt> object.
*
* If the dynamic cast fails then a <tt>std::bad_cast</tt> exception
* is thrown containing a very detailed error message as to why the
* cast failed.
*
* This function is simple enough and developers can see what needs to
* be done to accomplish this type of access by looking at the source
* code by clicking on:
*
* \ingroup Epetra_Thyra_Op_Vec_adapters_grp
*/
template<class Scalar>
Teuchos::RCP<Epetra_Operator>
get_Epetra_Operator (LinearOpBase<Scalar>& /* op */)
{
TEUCHOS_TEST_FOR_EXCEPTION
(true, std::invalid_argument, "Thyra::get_Epetra_Operator: This function "
"only works if Scalar=double, because for Epetra objects, the only Scalar"
" type is double. Instead, Scalar = " <<
Teuchos::TypeNameTraits<Scalar>::name () << ".");
}
//! Full specialization for Scalar=double.
template<>
Teuchos::RCP<Epetra_Operator>
get_Epetra_Operator( LinearOpBase<double> &op );
/** \brief Get smart pointer to <tt>const</tt>
* <tt>Epetra_Operator</tt> object from reference to a <tt>const</tt>
* <tt>EpetraLinearOp</tt> accessed through its <tt>LinearOpBase</tt>
* interface.
*
* \param op [in] Reference to operator to extract <tt>Epetra_Operator</tt>
* out of.
*
* Preconditions:<ul>
* <li><tt>dynamic_cast<const EpetraLinearOp*>(&op) != NULL</tt>
* </ul>
*
* This function is designed to provide an easy way for non-C++ experts
* to get at the <tt>Epetra_Operator</tt> object that was stuck into
* an <tt>EpetraLinearOp</tt> object.
*
* If the dynamic cast fails then a <tt>std::bad_cast</tt> exception
* is thrown containing a very detailed error message as to why the
* cast failed.
*
* This function is simple enough and developers can see what needs to
* be done to accomplish this type of access by looking at the source
* code by clicking on:
*
* \ingroup Epetra_Thyra_Op_Vec_adapters_grp
*/
template<class Scalar>
Teuchos::RCP<const Epetra_Operator>
get_Epetra_Operator( const LinearOpBase<Scalar> & /* op */ )
{
TEUCHOS_TEST_FOR_EXCEPTION
(true, std::invalid_argument, "Thyra::get_Epetra_Operator: This function "
"only works if Scalar=double, because for Epetra objects, the only Scalar"
" type is double. Instead, Scalar = " <<
Teuchos::TypeNameTraits<Scalar>::name () << ".");
}
//! Full specialization for Scalar=double.
template<>
Teuchos::RCP<const Epetra_Operator>
get_Epetra_Operator( const LinearOpBase<double> &op );
} // namespace Thyra
#endif // THYRA_GET_EPETRA_OPERATOR_HPP
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