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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
//
//===----------------------------------------------------------------------===//
@usableFromInline
@frozen
internal struct _DequeSlot {
@usableFromInline
internal var position: Int
@inlinable
@inline(__always)
init(at position: Int) {
assert(position >= 0)
self.position = position
}
}
extension _DequeSlot {
@inlinable
@inline(__always)
internal static var zero: Self { Self(at: 0) }
@inlinable
@inline(__always)
internal func advanced(by delta: Int) -> Self {
Self(at: position &+ delta)
}
@inlinable
@inline(__always)
internal func orIfZero(_ value: Int) -> Self {
guard position > 0 else { return Self(at: value) }
return self
}
}
extension _DequeSlot: CustomStringConvertible {
@usableFromInline
internal var description: String {
"@\(position)"
}
}
extension _DequeSlot: Equatable {
@inlinable
@inline(__always)
static func ==(left: Self, right: Self) -> Bool {
left.position == right.position
}
}
extension _DequeSlot: Comparable {
@inlinable
@inline(__always)
static func <(left: Self, right: Self) -> Bool {
left.position < right.position
}
}
extension Range where Bound == _DequeSlot {
@inlinable
@inline(__always)
internal var _count: Int { upperBound.position - lowerBound.position }
}
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