Initializer

init(bytesNoCopy:count:deallocator:)

Creates a data buffer with memory content without copying the bytes.

Declaration

init(bytesNoCopy bytes: UnsafeMutableRawPointer, count: Int, deallocator: Data.Deallocator)

Parameters

bytes

A pointer to the bytes.

count

The size of the bytes.

deallocator

Specifies 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.

See Also

Creating Populated Data

init()

Creates an empty data buffer.

init<S>(S)

Creates a new instance of a collection containing the elements of a sequence.

init<SourceType>(buffer: UnsafeBufferPointer<SourceType>)

Creates a data buffer with copied memory content using a buffer pointer.

init<SourceType>(buffer: UnsafeMutableBufferPointer<SourceType>)

Creates a data buffer with copied memory content using a mutable buffer pointer.

init(bytes: UnsafeRawPointer, count: Int)

Creates data with copied memory content.

init(capacity: Int)

Creates an empty data buffer of a specified size.

init(count: Int)

Creates a new data buffer with the specified count of zeroed bytes.