[dune-functions] SizePrefix

[Oliver Sander]

Hi Carsten,

> The problem would no longer exist, if we require the type of a size
> prefix to be a ReservedVector<size_type,k> where k is a template
> parameter of the size(...) method. For convince we could still
> export a fixed SizePrefix type which is always large enough to
> traverse the whole index tree.
> 
> Does anyone see potential problems with this solution?

I don't currently see a problem with this, but I wonder whether std::array
would be noticeably faster in the many situations where the multi-index
size is fixed.

How about requiring ReservedVector for the time being, until somebody
comes up with a convincing use-case for an alternative?

Best,
Oliver

> 
> Best,
> Carsten
> 
> 
> 
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