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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2023 - 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
//
//===----------------------------------------------------------------------===//
extension Rope {
@frozen // Not really! This module isn't ABI stable.
@usableFromInline
internal struct _UnmanagedLeaf {
@usableFromInline internal typealias _Item = Rope._Item
@usableFromInline internal typealias _Leaf = _Storage<_Item>
@usableFromInline internal typealias _UnsafeHandle = Rope._UnsafeHandle
@usableFromInline var _ref: Unmanaged<_Leaf>
@inlinable
internal init(_ leaf: __shared _Leaf) {
_ref = .passUnretained(leaf)
}
}
}
extension Rope._UnmanagedLeaf: Equatable {
@inlinable
internal static func ==(left: Self, right: Self) -> Bool {
left._ref.toOpaque() == right._ref.toOpaque()
}
}
extension Rope._UnmanagedLeaf {
@inlinable
internal func read<R>(
body: (_UnsafeHandle<_Item>) -> R
) -> R {
_ref._withUnsafeGuaranteedRef { leaf in
leaf.withUnsafeMutablePointers { h, p in
let handle = _UnsafeHandle(isMutable: false, header: h, start: p)
return body(handle)
}
}
}
}
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