quadrature_gauss.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_QUADRATURE_GAUSS_H
#define LIBMESH_QUADRATURE_GAUSS_H

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

namespace libMesh
{

class QGauss : public QBase
{
public:

  QGauss (unsigned int dim,
          Order order=INVALID_ORDER) :
    QBase(dim, order)
  {
    if (dim == 1)
      init(EDGE2);
  }

  QGauss (const QGauss &) = default;
  QGauss (QGauss &&) = default;
  QGauss & operator= (const QGauss &) = default;
  QGauss & operator= (QGauss &&) = default;
  virtual ~QGauss() = default;

  virtual QuadratureType type() const override;

  virtual std::unique_ptr<QBase> clone() const override;

private:

  virtual void init_1D () override;
  virtual void init_2D () override;
  virtual void init_3D () override;

  void dunavant_rule(const Real rule_data[][4],
                     const unsigned int n_pts);

  void dunavant_rule2(const Real * wts,
                      const Real * a,
                      const Real * b,
                      const unsigned int * permutation_ids,
                      const unsigned int n_wts);

  void keast_rule(const Real rule_data[][4],
                  const unsigned int n_pts);
};

} // namespace libMesh

#endif // LIBMESH_QUADRATURE_GAUSS_H