将我自己的类型的值添加到 Set

为了定义你自己类型的 Set，你需要使你的类型符合 Hashable

struct Starship: Hashable {
    let name: String
    var hashValue: Int { return name.hashValue }
}

func ==(left:Starship, right: Starship) -> Bool {
    return left.name == right.name
}

现在你可以创建一个 Set 的 Starship(s)

let ships : Set<Starship> = [Starship(name:"Enterprise D"), Starship(name:"Voyager"), Starship(name:"Defiant") ]