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Diffstat (limited to 'src/library/scala/collection/GenTraversableOnce.scala')
| -rw-r--r-- | src/library/scala/collection/GenTraversableOnce.scala | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/library/scala/collection/GenTraversableOnce.scala b/src/library/scala/collection/GenTraversableOnce.scala index 4af2ca23be..f87f7654bc 100644 --- a/src/library/scala/collection/GenTraversableOnce.scala +++ b/src/library/scala/collection/GenTraversableOnce.scala @@ -96,6 +96,12 @@ trait GenTraversableOnce[+A] extends Any { */ def size: Int + /** The size of this $coll, if it can be cheaply computed + * + * @return the number of elements in this $coll, or -1 if the size cannot be determined cheaply + */ + protected[collection] def sizeHintIfCheap: Int = -1 + /** Tests whether the $coll is empty. * * Note: Implementations in subclasses that are not repeatedly traversable must take |