periodic_boundaries.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_PERIODIC_BOUNDARIES_H
#define LIBMESH_PERIODIC_BOUNDARIES_H
 
// Local Includes
#include "libmesh/libmesh_config.h"
 
#ifdef LIBMESH_ENABLE_PERIODIC
 
// Local Includes
#include "libmesh/vector_value.h" // RealVectorValue
 
// C++ Includes
#include <map>
#include <memory>
 
namespace libMesh
{
 
// Forward Declarations
class Elem;
class PeriodicBoundaryBase;
class PointLocatorBase;
 
class PeriodicBoundaries : public std::map<boundary_id_type, std::unique_ptr<PeriodicBoundaryBase>>
{
public:
  PeriodicBoundaryBase * boundary(boundary_id_type id);
 
  const PeriodicBoundaryBase * boundary(boundary_id_type id) const;
 
  PeriodicBoundaries() = default;
 
  ~PeriodicBoundaries();
 
  // \returns the periodic neighbor of \p e in direction \p side, if it
  // exists, nullptr otherwise.
  //
  // If \p neigh_side is nullptr it is left alone; if not then it is
  // used to output the side of the neighbor which corresponds to the
  // given \p side of \p e, or invalid_uint if no possible neighbor or
  // no corresponding side exists.
  const Elem * neighbor(boundary_id_type boundary_id,
                        const PointLocatorBase & point_locator,
                        const Elem * e,
                        unsigned int side,
                        unsigned int * neigh_side = nullptr) const;
};
 
} // namespace libMesh
 
#endif // LIBMESH_ENABLE_PERIODIC
 
#endif // LIBMESH_PERIODIC_BOUNDARIES_H