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Improved return type specialization for methods implemented in super-type

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This commit is contained in:
Oliver Schulz 2012-05-22 11:14:02 +02:00
parent 0c76e0f0f6
commit d3177bf08f
2 changed files with 24 additions and 12 deletions
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6
akka-actor/src/main/scala/akka/util/ByteString.scala
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@ -261,8 +261,10 @@ object ByteString {
sealed abstract class ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteString] {
override protected[this] def newBuilder = ByteString.newBuilder
// *must* be overridden by derived classes
override def iterator: ByteIterator = null
// *must* be overridden by derived classes. This construction is necessary
// to specialize the return type, as the method is already implemented in
// a parent trait.
override def iterator: ByteIterator = throw new UnsupportedOperationException("Method iterator is not implemented in ByteString")
@inline final override def head: Byte = this(0)
@inline final override def tail: ByteString = this.drop(1)