الأنواع العامّة (Generics)

func swapValues<T>(_ a: inout T, _ b: inout T) {
    let temp = a
    a = b
    b = temp
}

var x = 1, y = 2
swapValues(&x, &y)   // x=2, y=1

struct Stack<Element> {
    private var items: [Element] = []
    mutating func push(_ item: Element) { items.append(item) }
    mutating func pop() -> Element? { items.popLast() }
}

var s = Stack<Int>()
s.push(1)
s.push(2)
print(s.pop()!)   // 2

func largest<T: Comparable>(_ list: [T]) -> T? {
    return list.max()
}
print(largest([3, 7, 2])!)   // 7