iterator: add DoubleEndedIterator concept + other small commits #7707
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00da76d r=cmr
6e75f2d r=cmr
This implements the trait for vector iterators, replacing the reverse
iterator types. The methods will stay, for implementing the future
reverse Iterable traits and convenience.
This can also be trivially implemented for circular buffers and other
variants of arrays like strings.
The
DoubleEndedIterator
trait will allow for implementing algorithmslike in-place reverse on generic mutable iterators.
The naming (
Range
vs.Iterator
,Bidirectional
vs.DoubleEnded
)can be bikeshedded in the future.