mirror of https://github.com/sbt/sbt.git
22 lines
432 B
Scala
22 lines
432 B
Scala
|
/* sbt -- Simple Build Tool
|
||
|
|
* Copyright 2008 Mark Harrah
|
||
|
|
*/
|
||
|
|
package sbt
|
||
|
|
|
||
|
|
private final class LazyVar[T](initialValue: => T) extends NotNull
|
||
|
|
{
|
||
|
|
private[this] var value: Option[T] = None
|
||
|
|
def apply() =
|
||
|
|
synchronized
|
||
|
|
{
|
||
|
|
value match
|
||
|
|
{
|
||
|
|
case Some(v) => v
|
||
|
|
case None =>
|
||
|
|
val newValue = initialValue
|
||
|
|
value = Some(newValue)
|
||
|
|
newValue
|
||
|
|
}
|
||
|
|
}
|
||
|
|
def update(newValue: T) = synchronized { value = Some(newValue) }
|
||
|
|
}
|