[Dune] [#564] Use dynamic polymorphism

[Dune]

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FS#564 - Use dynamic polymorphism
User who did this - Peter Bastian (peter)

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Hi all,

I just like to repeat my argument: I do not see why the use of virtual functions needs to established in the interface. My idea was this: If your implementation is simple, e.g. one element type, one polynomial order, then there are no virtual functions. If your implementation is complicated, make a base class with virtual functions, say P1MultiElementTypeBase and derive from that your implementations for triangles and quads.

You propose to do it just the other way around: Hardwire the virtual functions in the interface and rely on some other quirk that removes them if you don't want them. I just don't see the point what is so bad with my solution (besides personal taste).

Besides all that I do not think that run-time is such a big issue there. It would be nice to see some numbers nevertheless. If they indicate that there is no difference, then let us use virtual functions. Period.

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