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author | Simon Ochsenreither <simon@ochsenreither.de> | 2012-08-14 22:36:31 +0200 |
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committer | Simon Ochsenreither <simon@ochsenreither.de> | 2012-08-14 22:36:31 +0200 |
commit | 7281be95992c9ef47a5a67487d34a30dabf23aa1 (patch) | |
tree | 25b3c0ab3d4136fddb0f9b2808047fa6efcfadcb /src/library | |
parent | d66c7a4fea537d142e42da91bfe87f4aaecc1821 (diff) | |
download | scala-7281be95992c9ef47a5a67487d34a30dabf23aa1.tar.gz scala-7281be95992c9ef47a5a67487d34a30dabf23aa1.tar.bz2 scala-7281be95992c9ef47a5a67487d34a30dabf23aa1.zip |
SI-6167 Override SeqLike#isEmpty for better performance
This results in a faster Vector#isEmpty (and head, tail, last, init)
because it avoids building a VectorIterator just to check if
iterator.hasNext is false.
Other classes which have not overridden the implementation of SeqLike
also benefit from it.
Diffstat (limited to 'src/library')
-rw-r--r-- | src/library/scala/collection/SeqLike.scala | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/library/scala/collection/SeqLike.scala b/src/library/scala/collection/SeqLike.scala index f6f08398d3..2fc3df0bd2 100644 --- a/src/library/scala/collection/SeqLike.scala +++ b/src/library/scala/collection/SeqLike.scala @@ -92,6 +92,8 @@ trait SeqLike[+A, +Repr] extends Any with IterableLike[A, Repr] with GenSeqLike[ i - len } + override /*IterableLike*/ def isEmpty: Boolean = lengthCompare(0) == 0 + /** The size of this $coll, equivalent to `length`. * * $willNotTerminateInf |