face.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2025 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_FACE_H
#define LIBMESH_FACE_H

// Local includes
#include "libmesh/elem.h"

namespace libMesh
{

class Face : public Elem
{
public:

  Face (const unsigned int nn,
        const unsigned int ns,
        Elem * p,
        Elem ** elemlinkdata,
        Node ** nodelinkdata) :
    Elem(nn, ns, p, elemlinkdata, nodelinkdata) {}

  Face (Face &&) = delete;
  Face (const Face &) = delete;
  Face & operator= (const Face &) = delete;
  Face & operator= (Face &&) = delete;
  virtual ~Face() = default;

  virtual unsigned short dim () const override final { return 2; }

  virtual unsigned int n_faces() const override final { return 0; }

  virtual std::unique_ptr<Elem> build_edge_ptr (const unsigned int i) override final
  { return build_side_ptr(i); }

  virtual void build_edge_ptr (std::unique_ptr<Elem> & edge, const unsigned int i) override final
  { build_side_ptr(edge, i); }

  using Elem::build_edge_ptr;

  virtual bool is_edge_on_side(const unsigned int e,
                               const unsigned int s) const override final
  { return (e == s); }

  virtual std::vector<unsigned int> sides_on_edge(const unsigned int e) const override final
  { return {e}; }

  virtual Point quasicircumcenter () const override;

#ifdef LIBMESH_ENABLE_INFINITE_ELEMENTS

  virtual bool infinite () const override final { return false; }

#endif

};

} // namespace libMesh

#endif // LIBMESH_FACE_H