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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2020 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
@usableFromInline
internal struct PriorityQueue<Element: Comparable> {
@usableFromInline
internal var _heap: Heap<Element>
internal init() {
self._heap = Heap()
}
@inlinable
internal mutating func remove(_ key: Element) {
self._heap.remove(value: key)
}
@inlinable
internal mutating func push(_ key: Element) {
self._heap.append(key)
}
@inlinable
internal func peek() -> Element? {
return self._heap.storage.first
}
@inlinable
internal var isEmpty: Bool {
return self._heap.storage.isEmpty
}
@inlinable
@discardableResult
internal mutating func pop() -> Element? {
return self._heap.removeRoot()
}
@inlinable
internal mutating func clear() {
self._heap = Heap()
}
}
extension PriorityQueue: Equatable {
@usableFromInline
internal static func ==(lhs: PriorityQueue, rhs: PriorityQueue) -> Bool {
return lhs.count == rhs.count && lhs.elementsEqual(rhs)
}
}
extension PriorityQueue: Sequence {
@usableFromInline
struct Iterator: IteratorProtocol {
private var queue: PriorityQueue<Element>
fileprivate init(queue: PriorityQueue<Element>) {
self.queue = queue
}
public mutating func next() -> Element? {
return self.queue.pop()
}
}
@usableFromInline
func makeIterator() -> Iterator {
return Iterator(queue: self)
}
}
extension PriorityQueue {
var count: Int {
return self._heap.count
}
}
extension PriorityQueue: CustomStringConvertible {
@usableFromInline
var description: String {
return "PriorityQueue(count: \(self.count)): \(Array(self))"
}
}
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