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author | Martin Odersky <odersky@gmail.com> | 2009-12-07 17:31:49 +0000 |
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committer | Martin Odersky <odersky@gmail.com> | 2009-12-07 17:31:49 +0000 |
commit | 1e88594f358d08b5e9b22ba87280003a581359e4 (patch) | |
tree | e68b6d1095ff1b1345e86d8a67c1f874849a31ff /src/library/scala/collection/mutable/MapLike.scala | |
parent | de1d172a15e20ec7e96d96d5cea5cb41162b9f75 (diff) | |
download | scala-1e88594f358d08b5e9b22ba87280003a581359e4.tar.gz scala-1e88594f358d08b5e9b22ba87280003a581359e4.tar.bz2 scala-1e88594f358d08b5e9b22ba87280003a581359e4.zip |
new doc comment generation, including some new ...
new doc comment generation, including some new style doc comments in
collection classes.
Diffstat (limited to 'src/library/scala/collection/mutable/MapLike.scala')
-rw-r--r-- | src/library/scala/collection/mutable/MapLike.scala | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/library/scala/collection/mutable/MapLike.scala b/src/library/scala/collection/mutable/MapLike.scala index d03858a68f..92f1b5bba6 100644 --- a/src/library/scala/collection/mutable/MapLike.scala +++ b/src/library/scala/collection/mutable/MapLike.scala @@ -103,6 +103,15 @@ trait MapLike[A, B, +This <: MapLike[A, B, This] with Map[A, B]] */ override def updated[B1 >: B](key: A, value: B1): mutable.Map[A, B1] = this + ((key, value)) + /** If given key is already in this map, returns associated value + * Otherwise, computes value from given expression `op`, stores with key + * in map and returns that value. + */ + def cached(key: A, op: => B) = get(key) match { + case Some(v) => v + case None => val v = op; update(key, v); v + } + /** Add a new key/value mapping and return the map itself. * * @param kv the key/value mapping to be added |