swift - Swift OptionSetType按位或

假设我有以下OptionSetType

struct Modifier : OptionSetType {

    typealias RawValue = Int
    var rawValue: RawValue = 0

    static let Default: Modifier = [.Public, .Package, .Internal]

    static let Public    = Modifier(rawValue: 1 << 0)
    static let Package   = Modifier(rawValue: 1 << 1)
    static let Protected = Modifier(rawValue: 1 << 2)
    static let Internal  = Modifier(rawValue: 1 << 3)
    static let Private   = Modifier(rawValue: 1 << 4)

    static let Static    = Modifier(rawValue: 1 << 5)
    static let Final     = Modifier(rawValue: 1 << 6)

    init(rawValue: RawValue) {
        self.rawValue = rawValue
    }

}

如何确定Modifier类型的值是否至少包含Modifier.Default中包含的一个元素？

最佳答案

这个怎么样？

let modifier: Modifier = ...

if Modifier.Default.contains(modifier) {

}