On Tuesday, 24 December 2013 at 10:38:17 UTC, Francesco Cattoglio
wrote:
The range will only be a RA range for types that implement (inc
* n) and ((end - begin) / step) (used for lenght computation),
otherwise it will be a ForwardRange, because it can't be
directional if we can't compute the last element in O(1).
Bidirectionality and random access are separate capabilities; the
former can be supported without the latter through `--end`, and
`end == start`, and we should support that. If it causes problems
when the same range is traversed from both ends, then that is an
issue with the UDT's operator overloads.
