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Improve performance of Collection.removeFirst(_:) where Self == SubSequence #32451

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Merged
swift-ci merged 5 commits into from
Jun 28, 2020
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Improve performance of Collection.removeFirst(_:) where Self == SubSequence #32451

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099ecbe
Improve performance of Collection.removeFirst(_:) where Self == SubSe…
stephencelis Jun 18, 2020
ce78396
Update stdlib/public/core/Collection.swift
stephencelis Jun 18, 2020
0ce01d5
Update Collection.swift
stephencelis Jun 18, 2020
3b8d8b7
Update Collection.swift
stephencelis Jun 18, 2020
e150b37
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stephencelis Jun 19, 2020
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2 changes: 1 addition & 1 deletion stdlib/public/core/Collection.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1664,7 +1664,7 @@ extension Collection where SubSequence == Self {
public mutating func removeFirst(_ k: Int) {
if k == 0 { return }
_precondition(k >= 0, "Number of elements to remove should be non-negative")
_precondition(count >= k,
_precondition(index(startIndex, offsetBy: k, limitedBy: endIndex) != nil,
"Can't remove more items from a collection than it contains")
self = self[index(startIndex, offsetBy: k)..<endIndex]
}
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