Random integers without shuttling between UInt32 and Int

randomInt.swift

func arc4random_uniform<T: SignedIntegerType>(max: T) -> T {
    let max32: Int32 = numericCast(max)
    return T(Int64(arc4random_uniform(UInt32(max32))))
}

func arc4random_uniform<T: UnsignedIntegerType>(max: T) -> T {
    let max32: UInt32 = numericCast(max)
    return T(UInt64(arc4random_uniform(max32)))
}

let max = 20
for _ in 1...5 {
    // look, a random Int:
    let randomInt: Int = arc4random_uniform(max)
    println(randomInt)
}