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// NOX: An Object-Oriented Nonlinear Solver Package
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#ifndef NOX_ABSTRACT_IMPLICIT_WEIGHTING_H
#define NOX_ABSTRACT_IMPLICIT_WEIGHTING_H
#include "NOX_Common.H" // for NOX_Config.h
namespace NOX {
namespace Abstract {
/*!
\brief A pure virtual interface for enabling/disabling any user defined implicit weighting of the concrete object.
This class is used to toggle on/off any implicit weighting that
might be handled internal to a particular user defined class. The
classical use case is to disable an implicitly defined weighting on
the inner product and norm computations of the abstract vector class
so that classes like the NormWRMS can apply their own weighting.
This prevents a "double weight" effect being applied to specific
status tests.
The typical use case is the get the current weighting flag, then
disable the weighting, perform the computations on the unweighted
object and then set the flag back to its original value. By storing
the original value, one can return it to its prior state regardless
if an implicit weighting is defined.
\code
NOX::ImplicitWeighting& v;
bool saved_status = v.getImplicitWeighting();
v.setImplicitWeighting(false);
.
<perform unweighted computaiton>
.
v.setImplicitWeighting(saved_status);
\endcode
CAUTION: This is a power user feature and should only be used in
concert with specialized NOX::Abstract::Vector implementations.
\author Roger Pawlowski (SNL 1444)
*/
class ImplicitWeighting {
public:
virtual ~ImplicitWeighting() {}
/** \brief Return true if implicit weighting is currently enabled
CAUTION: This is a power user feature and should only be used in
concert with specialized NOX::Abstract::Vector implementations.
*/
virtual bool getImplicitWeighting() const = 0;
/** \brief Set to true to enable implicit weighting, false disables
CAUTION: This is a power user feature and should only be used in
concert with specialized NOX::Abstract::Vector implementations.
*/
virtual void setImplicitWeighting(bool do_implicit_weighting) = 0;
};
} // namespace Abstract
} // namespace NOX
#endif
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