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| author | Lukas Rytz <lukas.rytz@gmail.com> | 2017-03-30 09:01:47 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-03-30 09:01:47 +0200 |
| commit | ecf3fa6c06c0a73abb3616fb87d08040369c6294 (patch) | |
| tree | 5cd3ed06fdcadf7cbee28cb2c5601833b41bbdba | |
| parent | f5ce29b7f4afaf00ac644665963e017a9fa253d9 (diff) | |
| parent | 40f0514f177c05d6171cc122a2ce30e9e6cfe6af (diff) | |
| download | scala-ecf3fa6c06c0a73abb3616fb87d08040369c6294.tar.gz scala-ecf3fa6c06c0a73abb3616fb87d08040369c6294.tar.bz2 scala-ecf3fa6c06c0a73abb3616fb87d08040369c6294.zip | |
Merge pull request #5802 from jrudolph/jr/w/ListBuffer-isEmpty-nonEmpty
Implement ListBuffer.isEmpty / nonEmpty / head efficiently
| -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 = |