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| @@ -0,0 +1,31 @@ | ||
| // | ||
| // CaseIterable.swift | ||
| // SwiftExtensions | ||
| // | ||
| // Created by Atsushi Miyake on 2018/09/09. | ||
| // Copyright © 2018年 Atsushi Miyake. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| public protocol CaseIterable { | ||
| static var allCases: [Self] { get } | ||
| } | ||
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| extension CaseIterable where Self: Hashable { | ||
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| private static var iterator: AnyIterator<Self> { | ||
| var n = 0 | ||
| return AnyIterator { | ||
| defer { n += 1 } | ||
| let next = withUnsafePointer(to: &n) { | ||
| UnsafeRawPointer($0).assumingMemoryBound(to: Self.self).pointee | ||
| } | ||
| return next.hashValue == n ? next : nil | ||
| } | ||
| } | ||
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| public static var allCases: [Self] { | ||
| return Array(self.iterator) | ||
| } | ||
| } |
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