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[stdlib] add withContiguousStorage to CollectionOfOne #66562

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[stdlib] add withContiguousStorage to CollectionOfOne #66562

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12 changes: 12 additions & 0 deletions stdlib/public/core/CollectionOfOne.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,18 @@ extension CollectionOfOne.Iterator: IteratorProtocol {
}
}

extension CollectionOfOne: Sequence {
@inlinable // trivial-implementation
public func withContiguousStorageIfAvailable<R>(
_ body: (UnsafeBufferPointer<Element>) throws -> R
) rethrows -> R? {
return try withUnsafePointer(to: _element) {
let buf = UnsafeBufferPointer(start: $0, count: 1)
return try body(buf)
}
}
}

extension CollectionOfOne: RandomAccessCollection, MutableCollection {

public typealias Index = Int
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