Slide 5
Slide 5 text
public extension DispatchQueue {
public struct Attributes : OptionSet {
public let rawValue: UInt64
public init(rawValue: UInt64) { self.rawValue = rawValue }
public static let concurrent = Attributes(rawValue: 1<<1)
@available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
public static let initiallyInactive = Attributes(rawValue: 1<<2)
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https://github.com/apple/swift/blob/master/stdlib/public/SDK/Dispatch/Queue.swift