Initializer
init(bytesNoCopy:count:deallocator:)
iOS 8.0+
iPadOS 8.0+
Mac Catalyst 8.0+
macOS 10.10+
tvOS 9.0+
watchOS 2.0+
Creates a data buffer with memory content without copying the bytes.
init(bytesNoCopy bytes: UnsafeMutableRawPointer, count: Int, deallocator: Data.Deallocator)Parameters
bytesA pointer to the bytes.
countThe size of the bytes.
deallocatorSpecifies the mechanism to free the indicated buffer, or
.none.
Discussion
If the result is mutated and is not a unique reference, then the Data will still follow copy-on-write semantics. In this case, the copy will use its own deallocator. Therefore, it is usually best to only use this initializer when you either enforce immutability with let or ensure that no other references to the underlying data are formed.