IntegralOldVariablePostprocessor.h

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#pragma once
 
#include "ElementIntegralPostprocessor.h"
#include "ScalarTransportBase.h"
#include "MooseVariableInterface.h"
 
class IntegralOldVariablePostprocessor : public ElementIntegralPostprocessor,
                                         public ScalarTransportBase,
                                         public MooseVariableInterface<Real>
{
public:
  IntegralOldVariablePostprocessor(const InputParameters & parameters);
 
  static InputParameters validParams();
 
protected:
  virtual Real computeQpIntegral() override;
 
  const VariableValue & _u_old;
  const VariableGradient & _grad_u_old;
};