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[OrderedCollection] Use standard temp allocation facility, if available #160

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Aug 17, 2022
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[OrderedCollection] Use standard temp allocation facility, if available #160

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10 changes: 10 additions & 0 deletions Sources/OrderedCollections/Utilities/_UnsafeBitset.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,15 @@ extension _UnsafeBitset {
run body: (inout _UnsafeBitset) throws -> Void
) rethrows {
let wordCount = _UnsafeBitset.wordCount(forCapacity: capacity)
#if compiler(>=5.6)
return try withUnsafeTemporaryAllocation(
of: Word.self, capacity: wordCount
) { words in
words.initialize(repeating: .empty)
var bitset = Self(words: words, count: 0)
return try body(&bitset)
}
#else
if wordCount <= 2 {
var buffer: (Word, Word) = (.empty, .empty)
return try withUnsafeMutablePointer(to: &buffer) { p in
Expand All @@ -87,6 +96,7 @@ extension _UnsafeBitset {
defer { words.deallocate() }
var bitset = _UnsafeBitset(words: words, count: 0)
return try body(&bitset)
#endif
}
}

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