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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2021 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
#if !COLLECTIONS_SINGLE_MODULE
import InternalCollectionsUtilities
#endif
@usableFromInline
internal typealias _Word = _UnsafeBitSet._Word
extension Array where Element == _Word {
internal func _encodeAsUInt64(
to container: inout UnkeyedEncodingContainer
) throws {
if _Word.capacity == 64 {
for word in self {
try container.encode(UInt64(truncatingIfNeeded: word.value))
}
return
}
assert(_Word.capacity == 32, "Unsupported platform")
var first = true
var w: UInt64 = 0
for word in self {
if first {
w = UInt64(truncatingIfNeeded: word.value)
first = false
} else {
w |= UInt64(truncatingIfNeeded: word.value) &<< 32
try container.encode(w)
first = true
}
}
if !first {
try container.encode(w)
}
}
internal init(
_fromUInt64 container: inout UnkeyedDecodingContainer,
reservingCount count: Int? = nil
) throws {
self = []
if Element.capacity == 64 {
if let c = count {
self.reserveCapacity(c)
}
while !container.isAtEnd {
let v = try container.decode(UInt64.self)
self.append(Element(UInt(truncatingIfNeeded: v)))
}
return
}
assert(Element.capacity == 32, "Unsupported platform")
if let c = count {
self.reserveCapacity(2 * c)
}
while !container.isAtEnd {
let v = try container.decode(UInt64.self)
self.append(Element(UInt(truncatingIfNeeded: v)))
self.append(Element(UInt(truncatingIfNeeded: v &>> 32)))
}
}
}
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