scala.DelayedInit
Classes and objects (but note, not traits) inheriting the DelayedInit marker trait will have their initialization code rewritten as follows: code becomes delayedInit(code).
Initialization code comprises all statements and all value definitions that are executed during initialization.
Example:
trait Helper extends DelayedInit {
def delayedInit(body: => Unit) = {
println("dummy text, printed before initialization of C")
body // evaluates the initialization code of C
}
}
class C extends Helper {
println("this is the initialization code of C")
}
object Test extends App {
val c = new C
}
Should result in the following being printed:
dummy text, printed before initialization of C
this is the initialization code of C
"Delayed Initialization" subsection of the Scala Language Specification (section 5.1)
[Since version 2.11.0] DelayedInit semantics can be surprising. Support for `App` will continue. See the release notes for more details: https://github.com/scala/scala/releases/tag/v2.11.0
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