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Diffstat (limited to 'src/library/scala/collection/TraversableOnce.scala')
| -rw-r--r-- | src/library/scala/collection/TraversableOnce.scala | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/library/scala/collection/TraversableOnce.scala b/src/library/scala/collection/TraversableOnce.scala index de3b4770f3..a062d5710d 100644 --- a/src/library/scala/collection/TraversableOnce.scala +++ b/src/library/scala/collection/TraversableOnce.scala @@ -81,6 +81,22 @@ trait TraversableOnce[+A] { */ def toStream: Stream[A] + // Note: We could redefine this in TraversableLike to always return `repr` + // of type `Repr`, only if `Repr` had type bounds, which it doesn't, because + // not all `Repr` are a subtype `TraversableOnce[A]`. + // The alternative is redefining it for maps, sets and seqs. For concrete implementations + // we don't have to do this anyway, since they are leaves in the inheritance hierarchy. + /** A version of this collection with all + * of the operations implemented sequentially (i.e. in a single-threaded manner). + * + * This method returns a reference to this collection. In parallel collections, + * it is redefined to return a sequential implementation of this collection. In + * both cases, it has O(1) complexity. + * + * @return a sequential view of the collection. + */ + def seq: TraversableOnce[A] = this + /** Presently these are abstract because the Traversable versions use * breakable/break, and I wasn't sure enough of how that's supposed to * function to consolidate them with the Iterator versions. |