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[SR-11555] popFirst() requires the types '[Int]' and 'ArraySlice<Int>' be equivalent #53956

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krzyzanowskim opened this issue Oct 1, 2019 · 2 comments
Open

[SR-11555] popFirst() requires the types '[Int]' and 'ArraySlice<Int>' be equivalent #53956

krzyzanowskim opened this issue Oct 1, 2019 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@krzyzanowskim
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Previous ID SR-11555
Radar None
Original Reporter @krzyzanowskim
Type Bug
Environment

Apple Swift version 5.1 (swiftlang-1100.0.270.13 clang-1100.0.33.7)

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: f317b6bcacb696f4a627908e32beb39a

Issue Description:

var arr = [1,2,3]

//  error: referencing instance method 'popFirst()' on 'Collection' requires the types '[Int]' and 'ArraySlice<Int>' be equivalent
arr.popFirst()

It should works just like `popLast()` works
@belkadan
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belkadan commented Oct 1, 2019

Yeah, why is this one called removeFirst and popFirst is something else? @milseman and @lorentey might know.

@milseman
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Mannequin

milseman mannequin commented Oct 1, 2019

`popFirst()` and `popLast()` are only available for Collections that are their own slice types, hence that error message.

`extension [Bidirectional]Collection where SubSequence == Self { ... }`

edit: RangeReplaceableCollection does provide an implementation of `popLast()` though, but not `popFirst()`. It claims O(1), which `popFirst()` wouldn't be able to provide generally.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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@belkadan @krzyzanowskim