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rust How to pass out parameter to function from Swift FFI

// Create storage
var content: UnsafeMutablePointer<CChar>? // Could be NULL, so Optional
var length: Int32 = 0
var capacity: Int32 = 0

// Pass as references
do_something(&content, &length, &capacity)

// Copy the data
let data = Array(UnsafeRawBufferPointer(start: content, count: Int(length)))
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