Not sure on exactly how you are wanting to use this but you could approach this like:
let bytes: [UInt8] = [ 0xC0, 0xC0, 0xA1, 0x00, 0xC0, 0xC0, 0xA1, 0x00] let slice = bytes[0..<4] slice.withUnsafeBytes { buffer in let d = Data(bytesNoCopy: UnsafeMutableRawPointer(mutating: buffer.baseAddress!), count: buffer.count, deallocator: .none) // whatever you do, dont let d escape } > On May 4, 2017, at 16:31, Rick Mann via swift-users <swift-users@swift.org> > wrote: > > Is it possible to make a (immutable) Data() object from a slice of a [UInt8] > and avoid copying the data? > > -- > Rick Mann > rm...@latencyzero.com > > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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