On 7/6/21 2:45 AM, Simon Wiesheier wrote:
Is it also possible to get a reference (pointer) to the Solid object within
the constructor of 'AnotherClass', so without passing a solid reference to the
latters constructor? 'this' would in this case refer to the instance of
'AnotherClass'.
The class 'AnotherClass' needs access to objects of type DoFHandler<dim> and
CellDataStorage<typename T>. As for the DoFHandler<dim> the copy instructor,
i.e something like 'dof_handler(dof_handler_from_solid)' will delete
'dof_handler_from_solid'. It actually doesn't delete it but throws an
exception as it is also described in the documentation.
I checked a few source code files of the library how they manage the storage
of large objects, for instance the GridTools::Cache<dim> class stores a
triangulation like this:
SmartPointer<const Triangulation<dim>> tria;
So I did this in the same way for the DoFHandler and the CellDataStorage object:
SmartPointer<const DoFHandler<dim>> dof_handler;
...
Is this a efficient way to do that or is there a more sophisticated way to
store the member variables? I asked myself why dealii did not just use the
SmartPointers of the c++ standard library, namely std::shared_ptr<...>,
std::unique_ptr<...>,.... I guess most of them also make sure that they don't
become dangling pointers.
All of this is possible with minimal pain by using "lambda functions" and
"captured variables". You might want to read up on them in a recent C++ book :-)
Cheers
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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