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package dotty.tools.dotc.util
/** An efficient implementation of sequences of 16 indexed elements with
* values 0..15 in a single Long.
*
*/
class SixteenNibbles(val bits: Long) extends AnyVal {
import SixteenNibbles._
def apply(idx: Int): Int =
(bits >>> (idx * Width)).toInt & Mask
def updated(idx: Int, value: Int): SixteenNibbles =
new SixteenNibbles(
(bits & ~(LongMask << (idx * Width))) |
((value & Mask).toLong << (idx * Width)))
def elements: IndexedSeq[Int] = (0 until 16) map apply
override def toString =
s"SixteenNibbles(${elements.mkString(", ")})"
}
object SixteenNibbles {
final val Width = 4
final val Mask = (1 << Width) - 1
final val LongMask = Mask.toLong
}
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