[swift-users] Getting at the bytes of Data

[Ray Fix via swift-users]

I am writing a tutorial and creating a wrapper on streaming compression.  In 
the code, I setup the stream source pointer: (input is of type Data)

  // set up the stream with the input source
  input.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) in
    stream.src_ptr = bytes
  }
  stream.src_size = input.count

Input is guaranteed to be alive for the entire lifetime of the stream.  
Everything seems to work fine but I thought I remember reading somewhere that 
it is bad form to let the bytes escape out of the withUnsafeBytes closure.  
Anyone know if I'm I dipping into undefined behavior here?

Thanks in advanced,
Ray


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