Devansh:
My questions are
1. Which of these two approaches is considered the correct or safest way in
deal.II when handling a mix of primitive and non-primitive elements in an
hp context?
You can go either way, and at least for the element you have, it shouldn't
make a difference. (I assume you already tried that out.) I don't think this
is a performance critical operation, so that's not a consideration either. My
personal choice would be the second one where the if-condition picks out a
specific element by index, rather than ask about certain properties of the
element. That's because if you extend the element by additional base elements,
the if-condition in your first approach may or may not trigger for the
additional element; the second approach seems safer in this regard.
2. I am also aware of face_system_to_base_index(i). How does this function
differ from the 2 functions used above in this context and would it be a
better alternative?
face_system_to_base_index() basically combines the actions of
face_to_cell_index() and system_to_base_index(). From system_to_base_index(),
you can then determine system_to_component_index() or system_to_block_index().
So there is no conceptual difference.
Best
W.
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