> On Jun 27, 2016, at 9:39 AM, Dave Abrahams via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> Perhaps the language should accept types conforming to either of two
> unrelated protocols (your Sequence and Iterator, as you've described
> them, with no refinement relationship) for for-in.
>
The more I think about it the more I think this is a good model. Iterator is
already single-use. Sequence then describes a type that can vend multiple
iterators and is inherently multi-pass. I would argue the protocol is making
this guarantee already, since makeIterator() naturally lends itself to multiple
invocations.
In my example, LazyRowSequence becomes LazyRowIterator.
Russ
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