[petsc-users] adding calls before and after each iteration of snes

[hg]

Hello

I would like to ask if it is possible to add function call before and after
each iteration of SNES solve, e.g. InitializeNonLinearIteration and
FinalizeNonLinearIteration. It is particularly useful for debugging the
constitutive law or for post-processing to post the intermediate results.

Best
Giang
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