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Diffstat (limited to 'src')
-rw-r--r-- | src/library/scala/collection/immutable/LongMap.scala | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/library/scala/collection/immutable/LongMap.scala b/src/library/scala/collection/immutable/LongMap.scala index fab1b7f00b..60300c2a9e 100644 --- a/src/library/scala/collection/immutable/LongMap.scala +++ b/src/library/scala/collection/immutable/LongMap.scala @@ -12,6 +12,7 @@ package immutable import scala.collection.generic.{ CanBuildFrom, BitOperations } import scala.collection.mutable.{ Builder, MapBuilder } +import scala.annotation.tailrec /** Utility class for long maps. * @author David MacIver @@ -416,5 +417,20 @@ extends AbstractMap[Long, T] def ++[S >: T](that: LongMap[S]) = this.unionWith[S](that, (key, x, y) => y) + + @tailrec + final def firstKey: Long = this match { + case LongMap.Bin(_, _, l, r) => l.firstKey + case LongMap.Tip(k, v) => k + case LongMap.Nil => sys.error("Empty set") + } + + @tailrec + final def lastKey: Long = this match { + case LongMap.Bin(_, _, l, r) => r.lastKey + case LongMap.Tip(k , v) => k + case LongMap.Nil => sys.error("Empty set") + } + } |