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author | Paul Phillips <paulp@improving.org> | 2011-08-24 17:11:55 +0000 |
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committer | Paul Phillips <paulp@improving.org> | 2011-08-24 17:11:55 +0000 |
commit | b9785280a7138a2bb52060faf94807aa0d07dec1 (patch) | |
tree | 870cc1930ac3d50cd07078260f58984224dd39a5 /test/files/run/t603.scala | |
parent | 84fcf633d9ca507124806d64729cb8463bcebb69 (diff) | |
download | scala-b9785280a7138a2bb52060faf94807aa0d07dec1.tar.gz scala-b9785280a7138a2bb52060faf94807aa0d07dec1.tar.bz2 scala-b9785280a7138a2bb52060faf94807aa0d07dec1.zip |
Renamed tests named bugXXX to tXXX, no review.
Diffstat (limited to 'test/files/run/t603.scala')
-rw-r--r-- | test/files/run/t603.scala | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/test/files/run/t603.scala b/test/files/run/t603.scala new file mode 100644 index 0000000000..361cef1f41 --- /dev/null +++ b/test/files/run/t603.scala @@ -0,0 +1,33 @@ +object forceDelay { + class Susp[+A](lazyValue: => A) extends Function0[A] { + private var func: () => Any = () => lazyValue + private var value: Any = null + + override def apply() = { + if (func != null) { + value = func().asInstanceOf[A] + func = null + } + value.asInstanceOf[A] + } + + override def toString() = + if (func == null) "Susp(" + value + ")" + else "Susp(?)" + } + + def delay[A](value: => A) = new Susp[A](value) + implicit def force[A](s: Susp[A]): A = s() +} + +object Test { + import forceDelay._ + + def main(args: Array[String]) = { + val s: Susp[Int] = delay { Console.println("evaluating..."); 3 } + Console.println("s = " + s) + Console.println("s() = " + s()) + Console.println("s = " + s) + Console.println("2 + s = " + (2 + s)) + } +} |