[swift-evolution] [Draft] Rename Sequence.elementsEqual

Xiaodi Wu xiaodi.wu at gmail.com
Sun Oct 15 17:46:56 CDT 2017

On Sun, Oct 15, 2017 at 2:39 PM, Kevin Nattinger <swift at nattinger.net>

> […]
> Swift's Sequence protocol does not require the order of iteration to
> "convey any meaning"; it doesn't even require it to be deterministic.
> And that’s EXACTLY why none of the functions on Sequence should rely on
> the order conveying meaning.  `ElementsEqual` (for example) DOES rely on
> the order of iteration conveying a meaning not required by the protocol,
> and renaming it `lexicographicallyEquals` does not change that fact. Either
> Sequence needs to require a meaningful order or `elementsEqual` should be
> moved to a protocol that does.

What's your basis for saying that `elementsEqual` requires orders of
iteration that "convey a meaning"? It merely answers the question of
whether iterating over `a` is substitutable for iterating over `b`, a
question applicable to instances of any type which offers iterated access.
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