import Foundation

class ThreadSafeSet<T: Hashable> {
    private var set: Set<T> = []
    private let accessQueue = DispatchQueue(label: "com.example.ThreadSafeSet")

    func insert(_ newElement: T) {
        _ = accessQueue.sync {
            set.insert(newElement)
        }
    }

    func remove(_ element: T) {
        _ = accessQueue.sync {
            set.remove(element)
        }
    }

    var elements: Set<T> {
        accessQueue.sync { set }
    }

    func contains(_ element: T) -> Bool {
        accessQueue.sync { set.contains(element) }
    }
}