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[SR-11479] Conditionally make EnumeratedSequence conform to Collection #53879

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swift-ci opened this issue Sep 16, 2019 · 1 comment
Open

[SR-11479] Conditionally make EnumeratedSequence conform to Collection #53879

swift-ci opened this issue Sep 16, 2019 · 1 comment
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improvement standard library Area: Standard library umbrella

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@swift-ci
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Previous ID SR-11479
Radar None
Original Reporter CTMacUser (JIRA User)
Type Improvement
Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Improvement
Assignee None
Priority Medium

md5: 76c1052c3df9639d9f32660521687241

Issue Description:

As described in the summary, EnumeratedSequence should conform to Collection when its wrapped sequence does.

The implementation would probably need to cache the element's offset in the index. The problem is that endIndex would need to know the count of the wrapped collection. To make performance reasonable, the collection would need to be a RandomAccessCollection so we can generate count in constant time.

(So it's more "Make EnumeratedSequence conditionally conform to RandomAccessCollection.)
@belkadan
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Removing Starter Bug for now – we don't have an implementation of "conformances with availability" or "backwards-deployable conformances" yet, so we don't want someone picking it up just yet. cc @lorentey

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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improvement standard library Area: Standard library umbrella
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@belkadan @swift-ci