swift – 如何使用UnsafeMutableRawPoin

摘自：
https://www.jb51.cc/swift/443956.html

核心代码

let ptr: UnsafeRawPointer = ...
let length: Int = ...

let float4Ptr = ptr.bindMemory(to: float4.self,capacity: length)
let float4Buffer = UnsafeBufferPointer(start: float4Ptr,count: length)
let output = Array(float4Buffer)