Dear all, 

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

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.

Any Ideas?

Best,
Konrad

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