meshfree_interpolation_function.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 MESHFREE_INTERPOLATION_FUNCTION_H
#define MESHFREE_INTERPOLATION_FUNCTION_H
 
// libMesh Includes
#include "libmesh/function_base.h"
#include "libmesh/meshfree_interpolation.h"
#include "libmesh/threads.h"
 
// C++ includes
#include <cstddef>
#include <memory>
#include <vector>
 
namespace libMesh
{
 
// Forward Declarations
template <typename T> class DenseVector;
 
// ------------------------------------------------------------
// MeshfreeInterpolationFunction class definition
class MeshfreeInterpolationFunction : public FunctionBase<Number>
{
public:
  MeshfreeInterpolationFunction(const MeshfreeInterpolation & mfi,
                                Threads::spin_mutex & mutex);
 
  MeshfreeInterpolationFunction(MeshfreeInterpolationFunction &&) = default;
  MeshfreeInterpolationFunction(const MeshfreeInterpolationFunction &) = default;
 
  virtual ~MeshfreeInterpolationFunction() = default;
 
  MeshfreeInterpolationFunction & operator=(const MeshfreeInterpolationFunction &) = delete;
  MeshfreeInterpolationFunction & operator=(MeshfreeInterpolationFunction &&) = delete;
 
  void init();
 
  void clear();
 
  virtual std::unique_ptr<FunctionBase<Number>> clone() const;
 
  Number operator()(const Point & p, const Real time = 0.);
 
  void operator()(const Point & p, const Real time, DenseVector<Number> & output);
 
private:
  const MeshfreeInterpolation & _mfi;
  mutable std::vector<Point> _pts;
  mutable std::vector<Number> _vals;
  Threads::spin_mutex & _mutex;
};
 
} // namespace libMesh
 
#endif // MESHFREE_INTERPOLATION_FUNCTION_H