Berthold Stoeger 2e52f43d94 divetripmodel: mark derived classes as final
This is an idle "optimization": The compiler may now not need
to access the vtable when calling virtual functions.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2020-03-07 12:04:19 -08:00
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