[Dune] passing functions as arguments

[Aleksejs Fomins]

Dear Dune,

I have decided to implement an approximate integration method
alternative to the Quadrature Rule. For that, the integrator procedure
needs to sample from some function decided at runtime.

How would you approach such a construction?

As in, should I pass function/object as parameter? Also, I was told that
I should avoid using virtual functions when doing this.

Regards,
Aleksejs

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