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mgadda/write_to_immutable_array.swift

Created January 11, 2017 19:35
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How to write to an immutable array
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write_to_immutable_array.swift
let immutable = Array<Int32>(repeating: 0, count: 4) // => [0, 0, 0, 0]
let ptr = UnsafeMutablePointer<Int32>(mutating: immutable)
let mutableBuffer = UnsafeMutableBufferPointer(start: ptr, count: immutable.count * MemoryLayout<Int32>.size)
let data: Data = Data(bytes: [
0, 0, 0, 0,
1, 0, 0, 0,
2, 0, 0, 0,
3, 0, 0, 0])
data.copyBytes(to: mutableBuffer)
immutable // => [0, 1, 2, 3]
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