vector_tools_mean_value.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 1998 - 2020 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
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#ifndef dealii_vector_tools_mean_value_h
#define dealii_vector_tools_mean_value_h


#include <deal.II/base/config.h>

#include <deal.II/fe/mapping_q1.h>

DEAL_II_NAMESPACE_OPEN

template <int dim, int spacedim>
class DoFHandler;

namespace VectorTools
{

  template <typename VectorType>
  void
  subtract_mean_value(VectorType &v, const std::vector<bool> &p_select = {});


  template <int dim, typename VectorType, int spacedim>
  typename VectorType::value_type
  compute_mean_value(const Mapping<dim, spacedim> &   mapping,
                     const DoFHandler<dim, spacedim> &dof,
                     const Quadrature<dim> &          quadrature,
                     const VectorType &               v,
                     const unsigned int               component);

  template <int dim, typename VectorType, int spacedim>
  typename VectorType::value_type
  compute_mean_value(const DoFHandler<dim, spacedim> &dof,
                     const Quadrature<dim> &          quadrature,
                     const VectorType &               v,
                     const unsigned int               component);
} // namespace VectorTools

DEAL_II_NAMESPACE_CLOSE

#endif // dealii_vector_tools_mean_value_h