blob: b5c28360fa03d3b22d8d5de58d3a70cd72a5656d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
import language.experimental.macros
import language.implicitConversions
import scala.reflect.macros.blackbox.Context
import scala.reflect.runtime.universe.Tree
class ReflectiveClosure[A, B](val tree: Tree, fn: A => B) extends (A => B) {
def apply(x: A) = fn(x)
}
object ReflectiveClosure {
implicit def reflectClosure[A, B](f: A => B): ReflectiveClosure[A, B] = macro Macros.reflectiveClosureImpl[A, B]
}
object Macros {
def reflectiveClosureImpl[A, B](c: Context)(f: c.Expr[A => B]): c.Expr[ReflectiveClosure[A, B]] = {
import c.universe._
val u = treeBuild.mkRuntimeUniverseRef
val m = EmptyTree
val tree = c.Expr[scala.reflect.runtime.universe.Tree](Select(c.reifyTree(u, m, f.tree), newTermName("tree")))
c.universe.reify(new ReflectiveClosure(tree.splice, f.splice))
}
}
|