107 lines
2.3 KiB
Swift
107 lines
2.3 KiB
Swift
//
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// ManagedContiguousArray.swift
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// FirebladeECS
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//
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// Created by Christian Treffs on 28.10.17.
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//
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public protocol UniformStorage: class {
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associatedtype Element
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associatedtype Index
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var count: Int { get }
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func add(_ element: Element, at index: Index)
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func has(_ index: Index) -> Bool
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func get(at index: Index) -> Element?
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@discardableResult
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func remove(at index: Index) -> Bool
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func clear(keepingCapacity: Bool)
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}
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public class ManagedContiguousArray<Element>: UniformStorage {
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public typealias Index = Int
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private let chunkSize: Int
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private var size: Int = 0
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private var store: ContiguousArray<Element?> = []
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public init(minCount: Int = 4096) {
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chunkSize = minCount
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store = ContiguousArray<Element?>(repeating: nil, count: minCount)
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}
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deinit {
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clear()
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}
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public var count: Int {
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return size
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}
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public func add(_ element: Element, at index: Index) {
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if needsToGrow(index) {
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grow(including: index)
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}
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if store[index] == nil {
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size += 1
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}
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store[index] = element
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}
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public func has(_ index: Index) -> Bool {
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if store.count <= index {
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return false
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}
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return store[index] != nil
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}
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public func get(at index: Index) -> Element? {
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return store[index]
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}
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public func get(unsafeAt index: Index) -> Element {
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return store[index].unsafelyUnwrapped
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}
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@discardableResult
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public func remove(at index: Index) -> Bool {
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if store[index] != nil {
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size -= 1
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}
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store[index] = nil
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if size == 0 {
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clear()
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}
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return true
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}
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public func clear(keepingCapacity: Bool = false) {
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size = 0
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store.removeAll(keepingCapacity: keepingCapacity)
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}
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private func needsToGrow(_ index: Index) -> Bool {
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return index > store.count - 1
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}
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private func grow(including index: Index) {
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let newCapacity: Int = nearest(to: index)
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let newCount: Int = newCapacity - store.count
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for _ in 0..<newCount {
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store.append(nil)
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}
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}
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private func nearest(to index: Index) -> Int {
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let delta = Float(index) / Float(chunkSize)
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let multiplier = Int(delta) + 1
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return multiplier * chunkSize
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}
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}
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// MARK: - Equatable
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extension ManagedContiguousArray: Equatable where ManagedContiguousArray.Element: Equatable {
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public static func == (lhs: ManagedContiguousArray<Element>, rhs: ManagedContiguousArray<Element>) -> Bool {
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return lhs.store == rhs.store
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}
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}
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