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author | Paul Phillips <paulp@improving.org> | 2013-03-05 08:17:25 -0800 |
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committer | Paul Phillips <paulp@improving.org> | 2013-03-05 08:17:25 -0800 |
commit | 773f6a8df9ef95852918a706f3f19ebf0431baa8 (patch) | |
tree | 74ed6d735d07b11ab7c5abaf13adf0e62d744f8a /src/library | |
parent | 9b0dbdf4d788c0de7f9afb6c4a72c82727615ba8 (diff) | |
parent | ad6983518dd6860564d16f5b6e99178db3cff7a2 (diff) | |
download | scala-773f6a8df9ef95852918a706f3f19ebf0431baa8.tar.gz scala-773f6a8df9ef95852918a706f3f19ebf0431baa8.tar.bz2 scala-773f6a8df9ef95852918a706f3f19ebf0431baa8.zip |
Merge pull request #2198 from retronym/ticket/7215
SI-7215 Fix transpose of an empty Array[Array[T]].
Diffstat (limited to 'src/library')
-rw-r--r-- | src/library/scala/collection/mutable/ArrayOps.scala | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/src/library/scala/collection/mutable/ArrayOps.scala b/src/library/scala/collection/mutable/ArrayOps.scala index bb938a7aeb..25ba7e4ce6 100644 --- a/src/library/scala/collection/mutable/ArrayOps.scala +++ b/src/library/scala/collection/mutable/ArrayOps.scala @@ -76,18 +76,21 @@ trait ArrayOps[T] extends Any with ArrayLike[T, Array[T]] with CustomParalleliza * @return An array obtained by replacing elements of this arrays with rows the represent. */ def transpose[U](implicit asArray: T => Array[U]): Array[Array[U]] = { - def mkRowBuilder() = Array.newBuilder(ClassTag[U](arrayElementClass(elementClass))) - val bs = asArray(head) map (_ => mkRowBuilder()) - for (xs <- this) { - var i = 0 - for (x <- asArray(xs)) { - bs(i) += x - i += 1 + val bb: Builder[Array[U], Array[Array[U]]] = Array.newBuilder(ClassTag[Array[U]](elementClass)) + if (isEmpty) bb.result() + else { + def mkRowBuilder() = Array.newBuilder(ClassTag[U](arrayElementClass(elementClass))) + val bs = asArray(head) map (_ => mkRowBuilder()) + for (xs <- this) { + var i = 0 + for (x <- asArray(xs)) { + bs(i) += x + i += 1 + } } + for (b <- bs) bb += b.result() + bb.result() } - val bb: Builder[Array[U], Array[Array[U]]] = Array.newBuilder(ClassTag[Array[U]](elementClass)) - for (b <- bs) bb += b.result - bb.result } def seq = thisCollection |