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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2022 - 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
extension TreeDictionary {
/// A view of a dictionary’s values.
@frozen
public struct Values {
@usableFromInline
internal typealias _Node = TreeDictionary._Node
@usableFromInline
internal typealias _UnsafeHandle = _Node.UnsafeHandle
@usableFromInline
internal var _base: TreeDictionary
@inlinable
internal init(_base: TreeDictionary) {
self._base = _base
}
}
/// A collection containing just the values of the dictionary.
@inlinable
public var values: Values {
// Note: this property is kept read only for now until we decide whether
// it's worth providing setters without a `MutableCollection` conformance.
get {
Values(_base: self)
}
}
}
extension TreeDictionary.Values: Sendable
where Key: Sendable, Value: Sendable {}
extension TreeDictionary.Values: CustomStringConvertible {
// A textual representation of this instance.
public var description: String {
_arrayDescription(for: self)
}
}
extension TreeDictionary.Values: CustomDebugStringConvertible {
/// A textual representation of this instance, suitable for debugging.
public var debugDescription: String {
description
}
}
extension TreeDictionary.Values: Sequence {
public typealias Element = Value
@frozen
public struct Iterator: IteratorProtocol {
public typealias Element = Value
@usableFromInline
internal var _base: TreeDictionary.Iterator
@inlinable
internal init(_base: TreeDictionary.Iterator) {
self._base = _base
}
@inlinable
public mutating func next() -> Element? {
_base.next()?.value
}
}
@inlinable
public func makeIterator() -> Iterator {
Iterator(_base: _base.makeIterator())
}
}
extension TreeDictionary.Values.Iterator: Sendable
where Key: Sendable, Value: Sendable {}
// Note: This cannot be a MutableCollection because its subscript setter
// needs to invalidate indices.
extension TreeDictionary.Values: Collection {
public typealias Index = TreeDictionary.Index
@inlinable
public var isEmpty: Bool { _base.isEmpty }
@inlinable
public var count: Int { _base.count }
@inlinable
public var startIndex: Index { _base.startIndex }
@inlinable
public var endIndex: Index { _base.endIndex }
@inlinable
public subscript(index: Index) -> Element {
// The subscript is kept read only for now until we decide whether it's
// worth providing setters without a `MutableCollection` conformance.
// (With the current index implementation, mutating values must invalidate
// indices.)
get {
_base[index].value
}
}
@inlinable
public func formIndex(after i: inout Index) {
_base.formIndex(after: &i)
}
@inlinable
public func index(after i: Index) -> Index {
_base.index(after: i)
}
@inlinable
public func index(_ i: Index, offsetBy distance: Int) -> Index {
_base.index(i, offsetBy: distance)
}
@inlinable
public func index(
_ i: Index, offsetBy distance: Int, limitedBy limit: Index
) -> Index? {
_base.index(i, offsetBy: distance, limitedBy: limit)
}
@inlinable
public func distance(from start: Index, to end: Index) -> Int {
_base.distance(from: start, to: end)
}
}
#if false
extension TreeDictionary.Values: BidirectionalCollection {
// Note: Let's not do this. `BidirectionalCollection` would imply that
// the ordering of elements would be meaningful, which isn't true for
// `TreeDictionary.Values`.
@inlinable
public func formIndex(before i: inout Index) {
_base.formIndex(before: &i)
}
@inlinable
public func index(before i: Index) -> Index {
_base.index(before: i)
}
}
#endif
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