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///
/// http://stackoverflow.com/a/36539213/226791
///
func addressOf(_ o: UnsafeRawPointer) -> String {
    let addr = unsafeBitCast(o, to: Int.self)
    return String(format: "%p", addr)
}

func addressOf<T: AnyObject>(_ o: T) -> String {
    let addr = unsafeBitCast(o, to: Int.self)
    return String(format: "%p", addr)
}