Line data    Source code

       1             : // The libMesh Finite Element Library.
       2             : // Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
       3             : 
       4             : // This library is free software; you can redistribute it and/or
       5             : // modify it under the terms of the GNU Lesser General Public
       6             : // License as published by the Free Software Foundation; either
       7             : // version 2.1 of the License, or (at your option) any later version.
       8             : 
       9             : // This library is distributed in the hope that it will be useful,
      10             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             : // Lesser General Public License for more details.
      13             : 
      14             : // You should have received a copy of the GNU Lesser General Public
      15             : // License along with this library; if not, write to the Free Software
      16             : // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
      17             : 
      18             : 
      19             : 
      20             : #ifndef LIBMESH_QUADRATURE_SIMPSON_H
      21             : #define LIBMESH_QUADRATURE_SIMPSON_H
      22             : 
      23             : // Local includes
      24             : #include "libmesh/quadrature.h"
      25             : 
      26             : namespace libMesh
      27             : {
      28             : 
      29             : /**
      30             :  * This class implements Simpson quadrature.
      31             :  * This is the same thing as Newton-Cotes quadrature with three points.
      32             :  * Simpson's rule can integrate polynomials of degree three exactly.
      33             :  *
      34             :  * \author John W. Peterson
      35             :  * \date 2003
      36             :  * \brief Implements Simpson's rule, i.e. nodal quadrature for quadratic elements.
      37             :  */
      38             : class QSimpson : public QBase
      39             : {
      40             : public:
      41             : 
      42             :   /**
      43             :    * Constructor.  Declares the order of the quadrature rule.  We
      44             :    * explicitly call the \p init function in 1D since the other
      45             :    * tensor-product rules require this one.
      46             :    *
      47             :    * \note The element type, EDGE2, will not be used internally,
      48             :    * however if we called the function with INVALID_ELEM it would try
      49             :    * to be smart and return, thinking it had already done the work.
      50             :    */
      51             :   explicit
      52       10969 :   QSimpson (unsigned int dim,
      53       46343 :             Order order=THIRD) :
      54       46343 :     QBase(dim, order)
      55             :   {
      56       10969 :     if (dim == 1)
      57        5683 :       init(EDGE2);
      58       10969 :   }
      59             : 
      60             :   /**
      61             :    * Copy/move ctor, copy/move assignment operator, and destructor are
      62             :    * all explicitly defaulted for this simple class.
      63             :    */
      64           0 :   QSimpson (const QSimpson &) = default;
      65             :   QSimpson (QSimpson &&) = default;
      66             :   QSimpson & operator= (const QSimpson &) = default;
      67             :   QSimpson & operator= (QSimpson &&) = default;
      68       45089 :   virtual ~QSimpson() = default;
      69             : 
      70             :   /**
      71             :    * \returns \p QSIMPSON.
      72             :    */
      73             :   virtual QuadratureType type() const override;
      74             : 
      75             :   virtual std::unique_ptr<QBase> clone() const override;
      76             : 
      77             : private:
      78             : 
      79             :   virtual void init_1D () override;
      80             :   virtual void init_2D () override;
      81             :   virtual void init_3D () override;
      82             : };
      83             : 
      84             : } // namespace libMesh
      85             : 
      86             : #endif // LIBMESH_QUADRATURE_SIMPSON_H