[Dune] [#564] Use dynamic polymorphism

[Dune]

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FS#564 - Use dynamic polymorphism
User who did this - Carsten Gräser (Carsten)

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Supporting mixed elements is a must. The weakness of "should" only applies to the optimization. However saying virtual functions are slower is also a weak argument since it is simply not true in general.

Another solution would be to use virtual functions and to provide a template that wraps them. Then you could use either the virtual base class or the wrapped derived class in the application and benefit from either flexibility or the lack of virtual methods.
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