Hashable OpenSet

hashable_openset.swift

struct OptionSetHash: OptionSet, Hashable {
    let rawValue: Int
    
    var hashValue: Int {
        return self.rawValue
    }
    
    static let first  = OptionSetHash(rawValue: 1 << 0)
    static let second = OptionSetHash(rawValue: 1 << 1)
    static let third  = OptionSetHash(rawValue: 1 << 2)
    // add more options here
}

func ==(lhs: OptionSetHash, rhs: OptionSetHash) -> Bool {
    return lhs.hashValue == rhs.hashValue
}