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import scala.reflect.macros.Context
object Macros {
def impl(c: Context) = {
import c.universe._
val Expr(Block((cdef: ClassDef) :: Nil, _)) = reify { class C { def x = 2 } }
val cdef1 =
new Transformer {
override def transform(tree: Tree): Tree = tree match {
case Template(_, _, ctor :: defs) =>
val defs1 = defs collect {
case ddef @ DefDef(mods, name, tparams, vparamss, tpt, body) =>
val future = Select(Select(Select(Ident(newTermName("scala")), newTermName("concurrent")), newTermName("package")), newTermName("future"))
val Future = Select(Select(Ident(newTermName("scala")), newTermName("concurrent")), newTypeName("Future"))
val tpt1 = if (tpt.isEmpty) tpt else AppliedTypeTree(Future, List(tpt))
val body1 = Apply(future, List(body))
val name1 = newTermName("async" + name.toString.capitalize)
DefDef(mods, name1, tparams, vparamss, tpt1, body1)
}
Template(Nil, emptyValDef, ctor +: defs ::: defs1)
case _ =>
super.transform(tree)
}
} transform cdef
c.Expr[Unit](Block(cdef1 :: Nil, Literal(Constant(()))))
}
def foo = macro impl
}
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