Compile Error: no type named ‘active_cell_iterator’

[Matthew Rich]

Hi all,

Once again perplexed by the c++ compiler. I am getting the following error when trying to compile a program from the code gallery.

prog1.cc:In instantiation of ‘typename dealii::DataOut<dim, DoFHandlerType>::cell_iterator Prog1::FilteredDataOut<dim, DH>::first_cell() [with int dim = 3; DH = dealii::DoFHandler<3, 3>; typename dealii::DataOut<dim, DoFHandlerType>::cell_iterator = dealii::TriaIterator<dealii::CellAccessor<3, 3> >]’:
prog1.cc:2668:5:   required from here
prog1.cc:2670:54: error: no type named ‘active_cell_iterator’ in ‘class dealii::DataOut<3, dealii::DoFHandler<3, 3> >’
      typename DataOut<dim, DH>::active_cell_iterator cell = this->dofs->begin_active();
                                                      ^~~~
prog1.cc:2670:54: error: no type named ‘active_cell_iterator’ in ‘class dealii::DataOut<3, dealii::DoFHandler<3, 3> >’
prog1.cc: In instantiation of ‘typename dealii::DataOut<dim, DoFHandlerType>::cell_iterator Cartilage::FilteredDataOut<dim, DH>::next_cell(const typename dealii::DataOut<dim, DoFHandlerType>::cell_iterator&) [with int dim = 3; DH = dealii::DoFHandler<3, 3>; typename dealii::DataOut<dim, DoFHandlerType>::cell_iterator = dealii::TriaIterator<dealii::CellAccessor<3, 3> >]’:
prog1.cc:2678:5:   required from here
prog1.cc:2684:10: error: no type named ‘active_cell_iterator’ in ‘class dealii::DataOut<3, dealii::DoFHandler<3, 3> >’
       ++(FilteredIterator<typename DataOut<dim, DH>::active_cell_iterator>
         ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        (predicate,old_cell));

Looking in the manual I see the following which makes me think the code should work

using DataOut< dim, DoFHandlerType >::cell_iterator = typename DataOut_DoFData<DoFHandlerType, DoFHandlerType::dimension, DoFHandlerType::space_dimension>::cell_iterator

Should I just change active_cell_iterator to cell_iterator? I am worried that they wont work the same creating problems downstream.

Thanks in advance.

[Bruno Turcksin]

Hi,

On Monday, July 12, 2021 at 5:40:40 AM UTC-4 mjri...@gmail.com wrote:

Should I just change active_cell_iterator to cell_iterator? I am worried that they wont work the same creating problems downstream.

Only cell_iterator is accessible not active_cell_iterator. So yes, active_cell_iterator won't work but cell_iterator will. Like you expect, active_cell_iterator and cell_iterator do different things. You probably want to access the active_cell_iterator through the DoFHandler or the Triangulation.

Best,

Bruno

[Matthew Rich]

OK,

At one time did dataout have an active_cell_iterator property. The code gallery stuff may not get the same upkeep as the tutorials and maybe the library updated and broke this piece of the code. I see both

  typename DoFHandler<dim>::active_cell_iterator

and 

DataOut<dim, DH>::active_cell_iterator, which is with the outputting portion of the code. Is using the DoFHandler truly equivalent?

[Bruno Turcksin]

Yes, it looks like DataOut used to have DataOut<dim, DH>::active_cell_iterator. I looked back at an old version of deal.II and DataOut<dim, DH>::active_cell_iterator was just a typedef for Triangulation<dim, space_dim>::cell_iterator.

Bruno

[Wolfgang Bangerth]

On 7/12/21 7:28 AM, Matthew Rich wrote:
>
> At one time did dataout have an active_cell_iterator property. The code
> gallery stuff may not get the same upkeep as the tutorials and maybe the
> library updated and broke this piece of the code.

Yes, that seems to be the case. Would you be interested in submitting a patch?
The right approach is to simply use the corresponding DoFHandler iterator type.

Best
W.

--
------------------------------------------------------------------------
Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Matthew Rich]

If some one would guide me on how to submit the patch, I am willing to give it a go!

[Wolfgang Bangerth]

On 7/14/21 6:12 PM, Matthew Rich wrote:
> If some one would guide me on how to submit the patch, I am willing to give it
> a go!

That would be fantastic! An introduction is here:
https://github.com/dealii/dealii/wiki/Contributing

[hussan zeb]

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