node.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_NODE_H
#define LIBMESH_NODE_H
 
// Local includes
#include "libmesh/point.h"
#include "libmesh/dof_object.h"
#include "libmesh/reference_counted_object.h"
 
// C++ includes
#include <iostream>
#include <memory>
#include <vector>
 
namespace libMesh
{
 
// forward declarations
class Node;
class MeshBase;
class MeshRefinement;
 
class Node : public Point,
             public DofObject,
             public ReferenceCountedObject<Node>
{
 
public:
 
  explicit
  Node  (const Real x=0,
         const Real y=0,
         const Real z=0,
         const dof_id_type id = invalid_id);
 
#ifdef LIBMESH_ENABLE_DEPRECATED
  Node (const Node & n);
#else
  Node (const Node & n) = delete;
#endif
 
  explicit Node (const Point & p,
                 const dof_id_type id = invalid_id);
 
  template <typename T,
            typename = typename
              std::enable_if<ScalarTraits<T>::value,void>::type>
  explicit Node (const T x) :
    Point (x,0,0)
  { this->set_id() = invalid_id; }
 
  ~Node ();
 
  Node & operator= (const Point & p);
 
#ifdef LIBMESH_ENABLE_DEPRECATED
  static std::unique_ptr<Node> build (const Node & n);
#endif
 
  static std::unique_ptr<Node> build (const Point & p,
                                      const dof_id_type id);
 
  static std::unique_ptr<Node> build (const Real x,
                                      const Real y,
                                      const Real z,
                                      const dof_id_type id);
 
  bool active () const;
 
 
  bool operator ==(const Node & rhs) const;
 
  void print_info (std::ostream & os=libMesh::out) const;
 
  std::string get_info () const;
 
#ifdef LIBMESH_HAVE_MPI
  unsigned int packed_size() const
  {
    const unsigned int header_size = 2;
 
    // use "(a+b-1)/b" trick to get a/b to round up
    static const unsigned int idtypes_per_Real =
      (sizeof(Real) + sizeof(largest_id_type) - 1) / sizeof(largest_id_type);
 
    return header_size + LIBMESH_DIM*idtypes_per_Real +
      this->packed_indexing_size();
  }
 
#endif // #ifdef LIBMESH_HAVE_MPI
 
  unsigned int valence() const
  {
#ifdef LIBMESH_ENABLE_NODE_VALENCE
    return _valence;
#else
    libmesh_not_implemented();
    return libMesh::invalid_uint;
#endif
  }
 
  void set_valence(unsigned int val);
 
  processor_id_type choose_processor_id(processor_id_type pid1, processor_id_type pid2) const;
 
private:
 
  friend class MeshRefinement;
  friend class Elem;
 
#ifdef LIBMESH_ENABLE_NODE_VALENCE
  typedef unsigned char valence_idx_t;
 
  valence_idx_t _valence;
#endif
};
 
 
 
// ------------------------------------------------------------
// Global Node functions
 
inline
std::ostream & operator << (std::ostream & os, const Node & n)
{
  n.print_info(os);
  return os;
}
 
 
 
//------------------------------------------------------
// Inline functions
inline
Node::Node (const Real x,
            const Real y,
            const Real z,
            const dof_id_type dofid) :
  Point(x,y,z)
#ifdef LIBMESH_ENABLE_NODE_VALENCE
  ,
  _valence(0)
#endif
{
  this->set_id() = dofid;
}
 
 
#ifdef LIBMESH_ENABLE_DEPRECATED
inline
Node::Node (const Node & n) :
  Point(n),
  DofObject(), // Deliberately slicing!
  ReferenceCountedObject<Node>()
#ifdef LIBMESH_ENABLE_NODE_VALENCE
  ,
  _valence(0)
#endif
{
  libmesh_deprecated(); // Cast to Point first!
}
#endif // LIBMESH_ENABLE_DEPRECATED
 
 
 
inline
Node::Node (const Point & p,
            const dof_id_type dofid) :
  Point(p)
#ifdef LIBMESH_ENABLE_NODE_VALENCE
  ,
  _valence(0)
#endif
{
  // optionally assign the id.  We have
  // to do it like this otherwise
  // Node n = Point p would erase
  // the id!
  if (dofid != invalid_id)
    this->set_id() = dofid;
}
 
 
 
inline
Node::~Node ()
{
}
 
 
 
inline
Node & Node::operator= (const Point & p)
{
  (*this)(0) = p(0);
#if LIBMESH_DIM > 1
  (*this)(1) = p(1);
#endif
#if LIBMESH_DIM > 2
  (*this)(2) = p(2);
#endif
 
  return *this;
}
 
 
 
#ifdef LIBMESH_ENABLE_DEPRECATED
inline
std::unique_ptr<Node> Node::build(const Node & n)
{
  libmesh_deprecated();
  return std::make_unique<Node>(n);
}
#endif
 
 
 
inline
std::unique_ptr<Node> Node::build(const Point & p,
                                  const dof_id_type id)
{
  return std::make_unique<Node>(p,id);
}
 
 
 
inline
std::unique_ptr<Node> Node::build(const Real x,
                                  const Real y,
                                  const Real z,
                                  const dof_id_type id)
{
  return std::make_unique<Node>(x,y,z,id);
}
 
 
 
inline
bool Node::active () const
{
  return (this->id() != Node::invalid_id);
}
 
 
 
#ifdef LIBMESH_ENABLE_NODE_VALENCE
 
inline
void Node::set_valence (unsigned int val)
{
  _valence = cast_int<valence_idx_t>(val);
}
 
#else
 
inline
void Node::set_valence (unsigned int)
{
  libmesh_not_implemented();
}
 
#endif // #ifdef LIBMESH_ENABLE_NODE_VALENCE
 
} // namespace libMesh
 
 
#endif // LIBMESH_NODE_H