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author | stepancheg <stepancheg@epfl.ch> | 2008-06-25 16:22:45 +0000 |
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committer | stepancheg <stepancheg@epfl.ch> | 2008-06-25 16:22:45 +0000 |
commit | 57e2d8157c32ac81a9a905720533cae4369914d9 (patch) | |
tree | 0642bd2ec41c2191a429e63916c87f16962dafb4 /src | |
parent | a42ff8849134be26df1cec510ed031f837d79abb (diff) | |
download | scala-57e2d8157c32ac81a9a905720533cae4369914d9.tar.gz scala-57e2d8157c32ac81a9a905720533cae4369914d9.tar.bz2 scala-57e2d8157c32ac81a9a905720533cae4369914d9.zip |
Seq.apply, RandomAccessSeq.apply
Diffstat (limited to 'src')
-rw-r--r-- | src/library/scala/RandomAccessSeq.scala | 9 | ||||
-rw-r--r-- | src/library/scala/Seq.scala | 3 |
2 files changed, 12 insertions, 0 deletions
diff --git a/src/library/scala/RandomAccessSeq.scala b/src/library/scala/RandomAccessSeq.scala index 8608456f12..7cb46393d1 100644 --- a/src/library/scala/RandomAccessSeq.scala +++ b/src/library/scala/RandomAccessSeq.scala @@ -14,6 +14,15 @@ import collection.mutable.ArrayBuffer object RandomAccessSeq { + /** Create read only sequence of specified elements */ + def apply[A](xs: A*): RandomAccessSeq[A] = + if (xs.isEmpty) empty + else { + val buffer = new ArrayBuffer[A] + xs copyToBuffer buffer + buffer.readOnly + } + /** The empty sequence */ val empty : RandomAccessSeq[Nothing] = new RandomAccessSeq.Projection[Nothing] { def length = 0 diff --git a/src/library/scala/Seq.scala b/src/library/scala/Seq.scala index 763a2e8ec2..968d32ee57 100644 --- a/src/library/scala/Seq.scala +++ b/src/library/scala/Seq.scala @@ -26,6 +26,9 @@ object Seq { */ def unapplySeq[A](x: Seq[A]): Some[Seq[A]] = Some(x) + /** Create read only sequence of specified elements */ + def apply[A](xs: A*): Seq[A] = RandomAccessSeq(xs: _*) + case class singleton[A](value: A) extends RandomAccessSeq[A] { override def length = 1 override def isDefinedAt(idx: Int): Boolean = idx == 0 |