107 lines
2.6 KiB
Swift
107 lines
2.6 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the SwiftNIO open source project
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//
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// Copyright (c) 2017-2021 Apple Inc. and the SwiftNIO project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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public struct PriorityQueue<Element: Comparable> {
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@usableFromInline
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internal var _heap: Heap<Element>
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@inlinable
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public init() {
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self._heap = Heap()
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}
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@inlinable
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public mutating func remove(_ key: Element) {
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self._heap.remove(value: key)
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}
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@inlinable
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public mutating func removeFirst(where shouldBeRemoved: (Element) throws -> Bool) rethrows {
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try self._heap.removeFirst(where: shouldBeRemoved)
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}
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@inlinable
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public mutating func push(_ key: Element) {
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self._heap.append(key)
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}
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@inlinable
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public func peek() -> Element? {
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return self._heap.storage.first
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}
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@inlinable
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public var isEmpty: Bool {
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return self._heap.storage.isEmpty
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}
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@inlinable
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@discardableResult
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public mutating func pop() -> Element? {
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return self._heap.removeRoot()
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}
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@inlinable
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public mutating func clear() {
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self._heap = Heap()
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}
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}
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extension PriorityQueue: Equatable {
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@inlinable
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public static func ==(lhs: PriorityQueue, rhs: PriorityQueue) -> Bool {
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return lhs.count == rhs.count && lhs.elementsEqual(rhs)
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}
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}
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extension PriorityQueue: Sequence {
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public struct Iterator: IteratorProtocol {
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/* private but */ @usableFromInline
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var _queue: PriorityQueue<Element>
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/* fileprivate but */ @inlinable
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public init(queue: PriorityQueue<Element>) {
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self._queue = queue
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}
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@inlinable
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public mutating func next() -> Element? {
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return self._queue.pop()
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}
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}
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@inlinable
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public func makeIterator() -> Iterator {
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return Iterator(queue: self)
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}
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}
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extension PriorityQueue {
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@inlinable
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public var count: Int {
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return self._heap.count
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}
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}
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extension PriorityQueue: CustomStringConvertible {
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@inlinable
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public var description: String {
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return "PriorityQueue(count: \(self.count)): \(Array(self))"
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}
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}
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extension PriorityQueue: Sendable where Element: Sendable {}
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extension PriorityQueue.Iterator: Sendable where Element: Sendable {}
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