zeeshankhan

// Check If a string has all unique characters, without using additional data structure.
func isUnique(string: String) -> Bool {

    // what type of characters    // if ascii characters
    if string.characters.count > 128 {
        return true
    }

    var cIdx = 0
    for c in string.characters {

zeeshankhan

protocol QueueType {
    typealias Element
    mutating func enqueue(element: Element)
    mutating func dequeue() -> Element?
    func peek() -> Element?
}

final class Storage<Element> {

zeeshankhan

class A {
    var x = "a"
}

var a: A = A()
isUniquelyReferencedNonObjC(&a)

var b = a
isUniquelyReferencedNonObjC(&a)