Comment (by Roland Haas):

If you want to try if the overhead is an issue (you cannot really avoid CCTKi_VarDataPtrI but, other than the CCTK_HasAcccess call that function is basically a cctkGH->data[varindex][tl]) and you would have to comment out the CCTK_HasAccess call in src/main/GroupsOnGH.c.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2512/enable-detection-of-attribute-pure