gistfile1.swift

// There's some function that takes an UnsafeBufferPointer
func f(ubp: UnsafeBufferPointer<UInt8>)

...
    
// I want to call it with NSData
let data: NSData(...)
f(UnsafeBufferPointer(start: UnsafePointer<UInt8>(data.bytes), count: data.length))

// Would I need to NSData.withUnsafeBufferPointer() to exist? (Which of course it doesn't.)
 
// Or is there a way to convert NSData to [UInt8] without copying the data?
// (That feels impossible, since I can't promise [UInt8] is immutable)

// I'm slowly beginning to believe my use of [UInt8] is not nearly as "Swifty" as I thought,
// and that the correct way to hold data in Swift is NSData. I seem to constantly have little
// confusing corner cases every time I try to deal with [UInt8].