Merge pull request #25 from phaller/topic/minimal-var-lifting-2

Topic/minimal var lifting 2

1 files changed, 22 insertions, 0 deletions

diff --git a/src/main/scala/scala/async/TransformUtils.scala b/src/main/scala/scala/async/TransformUtils.scala
new file mode 100644
index 0000000..d36c277
--- /dev/null
+++ b/src/main/scala/scala/async/TransformUtils.scala
@@ -0,0 +1,22 @@
+/**
+ * Copyright (C) 2012 Typesafe Inc. <http://www.typesafe.com>
+ */
+package scala.async
+
+import scala.reflect.macros.Context
+
+/**
+ * Utilities used in both `ExprBuilder` and `AnfTransform`.
+ */
+class TransformUtils[C <: Context](val c: C) {
+  import c.universe._
+
+  protected def defaultValue(tpe: Type): Literal = {
+    val defaultValue: Any =
+      if (tpe <:< definitions.BooleanTpe) false
+      else if (definitions.ScalaNumericValueClasses.exists(tpe <:< _.toType)) 0
+      else if (tpe <:< definitions.AnyValTpe) 0
+      else null
+    Literal(Constant(defaultValue))
+  }
+}