gistfile1.txt

let size = MemoryLayout<Int64>.size // 8
let rawPointer = malloc(size)! // UnsafeMutableRawPointer

memset(rawPointer, 0, size)
for i in 0..<size {
    rawPointer.assumingMemoryBound(to: UInt8.self)[i] = UInt8(i)
}
let buffer = UnsafeRawBufferPointer(start: rawPointer, count: size)
for byte in buffer {
    print(byte) // 0, 1, 2, 3, 4, 5, 6, 7
}

free(rawPointer) // don't forget this!