// subactive end() accessor
ParallelMesh::element_iterator
ParallelMesh::subactive_elements_end ()
{
  Predicates::SubActive<elem_iterator_imp> p;
  return element_iterator(_elements.end(), _elements.end(), p);
}

// ancestor end() accessor
SerialMesh::element_iterator
SerialMesh::not_ancestor_elements_end ()
{
  Predicates::Ancestor<elem_iterator_imp> p;
  return element_iterator(_elements.end(), _elements.end(), p);
}

// active pid elements begin() accessor
SerialMesh::element_iterator
SerialMesh::active_pid_elements_begin (const processor_id_type proc_id)
{
  Predicates::ActivePID<elem_iterator_imp> p(proc_id);
  return element_iterator(_elements.begin(), _elements.end(), p);
}

// subdomain elements end() accessor
ParallelMesh::element_iterator
ParallelMesh::active_local_subdomain_elements_end (subdomain_id_type subdomain_id)
{
  Predicates::ActiveLocalSubdomain<elem_iterator_imp> p(this->processor_id(),subdomain_id);
  return element_iterator(_elements.end(), _elements.end(), p);
}

// active PID end() accessor
SerialMesh::element_iterator
SerialMesh::active_pid_elements_end (const unsigned int proc_id)
{
  Predicates::ActivePID<elem_iterator_imp> p(proc_id);
  return element_iterator(_elements.end(), _elements.end(), p);
}

// local elements begin() accessor
SerialMesh::element_iterator
SerialMesh::local_elements_begin ()
{
  Predicates::Local<elem_iterator_imp> p;
  return element_iterator(_elements.begin(), _elements.end(), p);
}