Dear Zhidong,
Thanks for finding and reporting this :)
When we compile the doxygen documentation we remove all occurrences of
dealii::
since, for a variety of reasons, it's easier to pretend in the manual
that all deal.II classes are in the global namespace. This is done
with, if I recall correctly, a simple text substitution - hence, the
webpage for step-40 has
using namespace ::LinearAlgebraPETSc
instead of what is actually in the source file:
using namespace dealii::LinearAlgebraPETSc
Put another way: this text substitution is wrong for this example and
needs to be fixed. Could you help us by opening a GitHub issue to
track this problem with the documentation?
Thanks,
David
On Wed, Dec 11, 2019 at 1:31 PM Zhidong Brian Zhang
<[email protected]> wrote:
>
> Dear, Colleagues,
>
> I tried to run the code from Step-40's webpage,
> https://www.dealii.org/current/doxygen/deal.II/step_40.html
>
> However, I encountered errors: error: ‘LinearAlgebraPETSc’ is not a
> namespace-name
> using namespace ::LinearAlgebraPETSc;
>
> So I compared the code from the locally installed file of Step-40 and found
> there is a slight difference:
>
> Webpage:
> namespace LA
> {
> #if defined(DEAL_II_WITH_PETSC) && !defined(DEAL_II_PETSC_WITH_COMPLEX) && \
> !(defined(DEAL_II_WITH_TRILINOS) && defined(FORCE_USE_OF_TRILINOS))
> using namespace ::LinearAlgebraPETSc;
> # define USE_PETSC_LA
> #elif defined(DEAL_II_WITH_TRILINOS)
> using namespace ::LinearAlgebraTrilinos;
> #else
> # error DEAL_II_WITH_PETSC or DEAL_II_WITH_TRILINOS required
> #endif
> } // namespace LA
>
> Locally installed:
> namespace LA
> {
> #if defined(DEAL_II_WITH_PETSC) && !defined(DEAL_II_PETSC_WITH_COMPLEX) && \
> !(defined(DEAL_II_WITH_TRILINOS) && defined(FORCE_USE_OF_TRILINOS))
> using namespace dealii::LinearAlgebraPETSc;
> # define USE_PETSC_LA
> #elif defined(DEAL_II_WITH_TRILINOS)
> using namespace dealii::LinearAlgebraTrilinos;
> #else
> # error DEAL_II_WITH_PETSC or DEAL_II_WITH_TRILINOS required
> #endif
> } // namespace LAEnter code here...
>
> I have highlighted the difference. After adding "dealii", the program can be
> run successfully.
>
> I guess maybe these are typos. I am new to deal.ii, so I am not sure my guess
> is correct or not. I am just curious about this (no offence), because I may
> miss some important point here.
>
> Thank you very much for your attention!
>
> Zhidong Brian Zhang
>
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