[Dune] [#1004] Make VTKFunctionPtr a const-pointer

[Dune]

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FS#1004 - Make VTKFunctionPtr a const-pointer
User who did this - Jö Fahlke (joe)

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I see only one implication, potentially: In the future, we won't be able to introduce a VTK-writer that calls non-const methods on the VTKFunctions.  However, I don't think that is an issue, since all the overridable virtual functions of the VTKFunction base class (ncomps(), evaluate(), name()) are declared const anyway.

The other thing I was wondering is whether deep down in the VTKWriter, something still relies on the VTKFunction beeing mutable (you never know...).  This is apparently not the case, since both code with the VTKSequenceWriter and the SubsamplingVTKWriter compiles.

Do you see anything else that could go awry?
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