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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
internal struct _DequeBufferHeader {
@usableFromInline
var capacity: Int
@usableFromInline
var count: Int
@usableFromInline
var startSlot: _DequeSlot
@usableFromInline
init(capacity: Int, count: Int, startSlot: _DequeSlot) {
self.capacity = capacity
self.count = count
self.startSlot = startSlot
_checkInvariants()
}
#if COLLECTIONS_INTERNAL_CHECKS
@usableFromInline @inline(never) @_effects(releasenone)
internal func _checkInvariants() {
precondition(capacity >= 0)
precondition(count >= 0 && count <= capacity)
precondition(startSlot.position >= 0 && startSlot.position <= capacity)
}
#else
@inlinable @inline(__always)
internal func _checkInvariants() {}
#endif // COLLECTIONS_INTERNAL_CHECKS
}
extension _DequeBufferHeader: CustomStringConvertible {
@usableFromInline
internal var description: String {
"(capacity: \(capacity), count: \(count), startSlot: \(startSlot))"
}
}
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