[Dune] [#827] rbegin of FieldVector and ISTL classes has surprising semantics

[Dune]

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The following task has a new comment added:

FS#827 - rbegin of FieldVector and ISTL classes has surprising semantics
User who did this - Jö Fahlke (joe)

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@Markus: To me, the paragraph you quoted appears to mandate a certain
relation of the iterator and the corresponding reverse_iterator.  It does not
say how this behaviour must be implemented.  AFAICT it is perfectly OK to
specialize std::reverse_iterator<FieldVector<K,n>::iterator>.  In particular,
dereferencing can be implemented as

reference operator*() const { return current[-1]; }

in the case of random_access iterators.

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