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| author | Johannes Rudolph <johannes.rudolph@gmail.com> | 2017-03-23 18:58:50 +0100 |
|---|---|---|
| committer | Johannes Rudolph <johannes.rudolph@gmail.com> | 2017-03-27 12:12:55 +0200 |
| commit | 40f0514f177c05d6171cc122a2ce30e9e6cfe6af (patch) | |
| tree | 74d1e89681c5b0a5b01d0e94d5102bb322878dd3 /src | |
| parent | f2c6005f3def940db3897f94b8ba4f0fe2fbd8f4 (diff) | |
| download | scala-40f0514f177c05d6171cc122a2ce30e9e6cfe6af.tar.gz scala-40f0514f177c05d6171cc122a2ce30e9e6cfe6af.tar.bz2 scala-40f0514f177c05d6171cc122a2ce30e9e6cfe6af.zip | |
Implement ListBuffer.isEmpty / nonEmpty efficiently
Uses the extra length information to provide more
efficient implementations.
Evaluating these methods turns up with about 5-6% of akka-http
message parsing.
Diffstat (limited to 'src')
| -rw-r--r-- | src/library/scala/collection/mutable/ListBuffer.scala | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/library/scala/collection/mutable/ListBuffer.scala b/src/library/scala/collection/mutable/ListBuffer.scala index 3bb7004184..aa79e972d5 100644 --- a/src/library/scala/collection/mutable/ListBuffer.scala +++ b/src/library/scala/collection/mutable/ListBuffer.scala @@ -119,6 +119,10 @@ final class ListBuffer[A] // Don't use the inherited size, which forwards to a List and is O(n). override def size = length + // Override with efficient implementations using the extra size information available to ListBuffer. + override def isEmpty: Boolean = len == 0 + override def nonEmpty: Boolean = len > 0 + // Implementations of abstract methods in Buffer override def apply(n: Int): A = |