On 5/13/21 3:05 PM, Konrad Simon wrote:
I am currently writing an interface to some p4est functions. The structure of
p4est makes it often necessary to pass data around through a user pointer of
whatever type (void*). When creating a new triangulation this pointer is set
to „this“ (the triangulation itself), see for example
https://www.dealii.org/current/doxygen/deal.II/distributed_2tria_8cc_source.html#l2989
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Is this pointer used in other interfaces somehow? p4est itself does not touch
it so I am wondering if I can reset it to anything I‘d like.
Konrad,
we use this user pointer in many of the functions that are called back from
p4est. Take a look at
RefineAndCoarsenList<dim, spacedim>::refine_callback
for example (line 761 of the file), and many other functions that you can find
by searching for
forest->user_pointer
in this file.
We consider the p4est forest object as internal to the p::d::T class, so I
would expect that you can't access it, or expect that you can use any of its
content for anything other than what the p::d::T class does with it.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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