mesh_inserter_iterator.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2019 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_MESH_INSERTER_ITERATOR_H
#define LIBMESH_MESH_INSERTER_ITERATOR_H
 
// Local includes
#include "libmesh/mesh_base.h"
 
// C++ includes
#include <iterator>
 
namespace libMesh
{
 
// Forward declarations
class Elem;
class Node;
class Point;
 
template <typename T>
struct mesh_inserter_iterator
  : std::iterator<std::output_iterator_tag, T>
{
  mesh_inserter_iterator (MeshBase & m) : mesh(m) {}
 
  void operator=(Elem * e) { mesh.add_elem(e); }
 
  void operator=(Node * n) { mesh.insert_node(n); }
 
  void operator=(Point * p) { mesh.add_point(*p); }
 
  mesh_inserter_iterator & operator++() {
    return *this;
  }
 
  mesh_inserter_iterator operator++(int) {
    return mesh_inserter_iterator(*this);
  }
 
  // We don't return a reference-to-T here because we don't want to
  // construct one or have any of its methods called.  We just want
  // to allow the returned object to be able to do mesh insertions
  // with operator=().
  mesh_inserter_iterator & operator*() { return *this; }
private:
 
  MeshBase & mesh;
};
 
} // namespace libMesh
 
 
#endif // LIBMESH_MESH_INSERTER_ITERATOR_H