Thanks! Now it becomes clear to me.
By the way, when I 'add_periodicity', I have compiler error on the red line
of the code.
Can you give me a clue to resolve this error?
//original argument
std::vector<dealii::GridTools::
PeriodicFacePair<typename DoFHandler<dim>::cell_iterator>> pairs;
GridTools::collect_periodic_faces(dof_handler,
/*b_id1*/ 6,
/*b_id2*/ 5,
/*direction*/ 0,
pairs);
triangulation.add_periodicity(pairs);
Error messages says that
*no viable conversion from*
* 'vector<PeriodicFacePair<TriaIterator<*
*dealii::internal::DoFHandler::Iterators<dealii::DoFHandler<2,*
* 2>, false>::CellAccessor**>>>' to '**const*
*vector<PeriodicFacePair<TriaIterator<**CellAccessor<2, 2>**>>>'*
triangulation.add_periodicity(pairs);
* ^~~~~*
also says that
candidate constructor not viable: no known conversion from
'std::vector<dealii::GridTools::PeriodicFacePair<typename
DoFHandler<2>::cell_iterator>
>' (aka
'vector<PeriodicFacePair<TriaIterator<DoFCellAccessor<DoFHandler<2, 2>,
false> >
> >') to 'const
std::__1::vector<dealii::GridTools::PeriodicFacePair<dealii::TriaIterator<dealii::CellAccessor<2,
2> > >,
std::__1::allocator<dealii::GridTools::PeriodicFacePair<dealii::TriaIterator<dealii::CellAccessor<2,
2> > > > > &' for 1st argument
vector(const vector& __x);
* ^*
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