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// Thyra: Interfaces and Support for Abstract Numerical Algorithms
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#ifndef THYRA_PRODUCT_MULTI_VECTOR_BASE_HPP
#define THYRA_PRODUCT_MULTI_VECTOR_BASE_HPP
#include "Thyra_MultiVectorBase.hpp"
namespace Thyra {
template<class Scalar> class ProductVectorSpaceBase;
/** \brief Base interface for product multi-vectors.
*
* This class defines an abstract interface for a multi-vector that is built
* out of the one or more other multi-vectors to form a product multi-vector.
* This class is only an interface. A standard implementation of this
* interface that should be sufficient for 99% or so of use cases is provided
* in the concrete subclass <tt>DefaultProductMultiVector</tt>.
*
* ToDo: Finish documentation!
*
* \ingroup Thyra_Op_Vec_extended_interfaces_code_grp
*/
template<class Scalar>
class ProductMultiVectorBase : virtual public MultiVectorBase<Scalar> {
public:
/** \brief Returns the associated product vector space that represents the
* range.
*
* If <tt>*this</tt> is uninitialized then <tt>return.get()==NULL</tt>.
*/
virtual Teuchos::RCP<const ProductVectorSpaceBase<Scalar> >
productSpace() const = 0;
/** \brief Return if the <tt>kth</tt> multi-vector block is const-only.
*
* \param k [in] The (zero-based) <tt>kth</tt> block index specifying which
* multi-vector block to access.
*
* Preconditions:<ul>
* <li> <tt>productSpace().get()!=NULL</tt>
* <li> <tt>0 <= k && k < productSpace()->numBlocks()</tt>
* </ul>
*/
virtual bool blockIsConst(const int k) const = 0;
/** \brief Returns a non-persisting non-<tt>const</tt> view of the
* zero-based <tt>kth</tt> block multi-vector.
*
* \param k [in] The (zero-based) <tt>kth</tt> block index specifying which
* multi-vector block to access.
*
* Preconditions:<ul>
* <li> <tt>productSpace().get()!=NULL</tt>
* <li> <tt>0 <= k && k < productSpace()->numBlocks()</tt>
* </ul>
*
* Note that <tt>*this</tt> is not guaranteed to be modified until the smart
* pointer returned from this function, as well as any other smart pointers
* created from this smart pointer, are destroyed. This requirement allows
* more flexibility in how this function is implemented.
*
* Also note that no further interactions with <tt>*this</tt> should be
* performed until the view returned from this function is released as
* described above.
*/
virtual Teuchos::RCP<MultiVectorBase<Scalar> >
getNonconstMultiVectorBlock(const int k) = 0;
/** \brief Returns a non-persisting <tt>const</tt> view of the (zero-based)
* <tt>kth</tt> block multi-vector.
*
* \param k [in] The (zero-based) <tt>kth</tt> block index specifying which
* multi-vector block to access.
*
* Preconditions:<ul>
* <li> <tt>productSpace().get()!=NULL</tt>
* <li> <tt>0 <= k && k < productSpace()->numBlocks()</tt>
* </ul>
*/
virtual Teuchos::RCP<const MultiVectorBase<Scalar> >
getMultiVectorBlock(const int k) const = 0;
private:
// Not defined and not to be called
ProductMultiVectorBase<Scalar>&
operator=(const ProductMultiVectorBase<Scalar>&);
};
} // namespace Thyra
#endif // THYRA_PRODUCT_MULTI_VECTOR_BASE_HPP
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