"is protected within this context" error for BlockSparseMatrix iterators

[Simon]

Dear all,

dealii::BlockSparseMatrix<double> systemMatrix;

auto systemMatrixIteratorEnd = systemMatrix.end(0);

auto systemMatrixIteratorBegin = systemMatrix.begin(0);

if (systemMatrixIteratorBegin != systemMatrixIteratorEnd) std::cout<<"Example"<<std::endl;

Using deal.ii 9.4.0, this results in the compilation error

include/deal.II/lac/matrix_iterator.h:184:20: error: ‘bool dealii::BlockMatrixIterators::Accessor<BlockMatrixType, false>::operator==(const dealii::BlockMatrixIterators::Accessor<BlockMatrixType, false>&) const [with BlockMatrixType = dealii::BlockMatrixBase<dealii::SparseMatrix<double> >]’ is protected within this context
  184 |   return (accessor == other.accessor);

include/deal.II/lac/block_matrix_base.h:1475:3: note: declared protected here
 1475 |   Accessor<BlockMatrixType, false>::operator==(const Accessor &a) const

Everything works if BlockSparseMatrix is replaced by SparseMatrix.

Is there anything I miss here?

Best

Simon

[Wolfgang Bangerth]

No, it's just an (interesting) bug. I have the fix here:
https://github.com/dealii/dealii/pull/16225
Thanks for pointing it out and providing a good testcase!

Best
W.

[Simon Wiesheier]

Thank you for the fix!

I have to stick to deal.ii 9.4.0 for a while which I installed via spack.  

Is there anything I can add to my user code or do I have to recompile the library with your changes? 

Best

Simon

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[Wolfgang Bangerth]

On 10/31/23 13:34, Simon Wiesheier wrote:
>
> I have to stick to deal.ii 9.4.0 for a while which I installed via spack.
> Is there anything I can add to my user code or do I have to recompile
> the library with your changes?

If you are able to edit the header files of your installation, you can
just make the same changes by hand that I made in the patch.

Best
W.