> On 30 Jun 2016, at 18:26, Dave Abrahams <[email protected]> wrote:
>
> Q: Why should there be indices on an infinite multipass sequence?
> A: Because the operations on indices apply equally well whether the
> sequence is finite or not. Find the index of a value in the
> sequence, slice the sequence, find again, etc.
Would it not make more sense for sequences that can benefit from subscripts to
just conform to Indexable? It seems like having basically all of the
Collection-specific methods on Sequence too would be confusing, and dilute any
nothing that these are sequences where elements are supposed to be consumed
in-order, as it would give the illusion that you can skip around with the
convenience of an array.
There's also the issue of how you would even index something that's potentially
infinite; you'd need to use a big integer in which case you could end up with
your indices growing to infinite size over time? It may not be very obvious
that this could be the case.
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