[Dune] [#587] GenericReferenceElements should use unsigned for indices, sizes etc.

[Dune]

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The following task has a new comment added:

FS#587 - GenericReferenceElements should use unsigned for indices, sizes etc.
User who did this - Atgeirr Flø Rasmussen (atgeirr)

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I think it is unfortunate to use unsigned types everywhere. Even if the quantities in question are always nonnegative, such as codimensions, we may still want to take differences of them or count backwards to zero etc. I suggest just using int all over the place. Of course, this may be a controversial issue, and I do not want to start a flame war...

Other advantages of int include readability and brevity (at least compared to std::size_t).

Atgeirr

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