[dune-pdelab] Access to another cell in alpha_skeleton

[Jonas Beddrich]

Hi everyone,

I'm looking for a method to access the values of cells in the
alpha_skeleton function of my local operator in addition to the values of
the inside and outside cell of the intersection.

The nonlinear Two Point Flux Approximation I'm currently working on
requires information about 4 cells to compute the flux through each
intersection. So in addition to the inside and outside cell two additional
cells m and k are required. The cells m and k are dependent on the
intersection, the inside and outside cell as well as problem parameters.
Right now I can determine the index of those cells and then get the
corresponding elements by iterating over the grid.

Sadly, I haven't found an efficient way to access the values of these
cells, since alpha_skeleton only gets the local vectors and local function
spaces of the inside and outside cell. But I guess I'm not the only person
encountering this problem. Can anyone give me a hint on how to solve this?

Best regards,
Jonas
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