Automatically determining a name for the timings table currently requires CRTP in the gridoperator. The reason we don't automatically determine a name from the function arguments is that demangling of the type names using `__cxa_demangle()` seems to fail, probably due to all the lambdas. Things to try: - [ ] Use the mangled name and pass it through `c++filt` in the `bench` script when outputting the timings - [x] Nope: [`__func__`](https://en.cppreference.com/w/cpp/language/function#func) (On PACXX, that seems to only contain the function name, i.e. `nonlinear_jacobian_apply_imp`, but not the class the function is a member of, and also not the types of the function arguments.)