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Diffstat (limited to 'src/library/scala/DelayedInit.scala')
-rw-r--r-- | src/library/scala/DelayedInit.scala | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/src/library/scala/DelayedInit.scala b/src/library/scala/DelayedInit.scala index e898bca720..52a38ca6f7 100644 --- a/src/library/scala/DelayedInit.scala +++ b/src/library/scala/DelayedInit.scala @@ -8,15 +8,41 @@ package scala -/** Classes and traits inheriting the `DelayedInit` marker trait - * will have their initialization code rewritten as follows: +/** 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 + * }}} + * + * @see "Delayed Initialization" subsection of the Scala Language Specification (section 5.1) + * * @author Martin Odersky */ trait DelayedInit { def delayedInit(x: => Unit): Unit -} +}
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