Contents

copyBytes(to:from:)

Copies the bytes in a range from the data into a buffer.

Declaration

func copyBytes<DestinationType>(to buffer: UnsafeMutableBufferPointer<DestinationType>, from range: Range<Data.Index>? = nil) -> Int

Parameters

  • buffer:

    A buffer to copy the data into.

  • range:

    A range in the data to copy into the buffer. If the range is empty, this function will return 0 without copying anything. If the range is nil, as much data as will fit into buffer is copied.

Return Value

Number of bytes copied into the destination buffer.

Discussion

If the count of the range is greater than MemoryLayout<DestinationType>.stride * buffer.count then only the first N bytes will be copied into the buffer.Precondition: The range must be within the bounds of the data. Otherwise fatalError is called.

See Also

Accessing Underlying Memory