array-unsafe-cast.swift

// I assume this is horribly illegal but it seems to work!
// NB. array size is fixed at creation time; it will never change.
// Also... source array is class instance variable.
func cast<T>(inout ary: Array<UInt8>) -> UnsafeMutablePointer<T> {
    var ptr: COpaquePointer = nil
    ary.withUnsafeMutableBufferPointer { (tmp) in
        ptr = COpaquePointer(tmp.baseAddress)
    }
    return UnsafeMutablePointer<T>(ptr)
}