tensor_shell_matrix.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 
 
#ifndef LIBMESH_TENSOR_SHELL_MATRIX_H
#define LIBMESH_TENSOR_SHELL_MATRIX_H
 
 
// Local includes
#include "libmesh/libmesh_common.h"
#include "libmesh/reference_counted_object.h"
#include "libmesh/libmesh.h"
#include "libmesh/shell_matrix.h"
#include "libmesh/numeric_vector.h"
 
namespace libMesh
{
 
template <typename T>
class TensorShellMatrix : public ShellMatrix<T>
{
public:
  TensorShellMatrix (const NumericVector<T> & v,
                     const NumericVector<T> & w);
 
  virtual ~TensorShellMatrix ();
 
  virtual numeric_index_type m () const override;
 
  virtual numeric_index_type n () const override;
 
  virtual void vector_mult (NumericVector<T> & dest,
                            const NumericVector<T> & arg) const override;
 
  virtual void vector_mult_add (NumericVector<T> & dest,
                                const NumericVector<T> & arg) const override;
 
  virtual void get_diagonal (NumericVector<T> & dest) const override;
 
protected:
  const NumericVector<T> & _v;
 
  const NumericVector<T> & _w;
};
 
 
 
//-----------------------------------------------------------------------
// TensorShellMatrix inline members
template <typename T>
inline
TensorShellMatrix<T>::TensorShellMatrix (const NumericVector<T> & v,
                                         const NumericVector<T> & w):
  ShellMatrix<T>(v.comm()),
  _v(v),
  _w(w)
{}
 
 
 
template <typename T>
inline
TensorShellMatrix<T>::~TensorShellMatrix ()
{}
 
 
 
template <typename T>
inline
numeric_index_type TensorShellMatrix<T>::m () const
{
  return _v.size();
}
 
 
 
template <typename T>
inline
numeric_index_type TensorShellMatrix<T>::n () const
{
  return _w.size();
}
 
 
} // namespace libMesh
 
 
#endif // LIBMESH_TENSOR_SHELL_MATRIX_H