woodyzhou / ScalaDynamicMixin

ScalaDynamicMixin

This DTrait enables dynamically mixin new class with its functions into existing instance extends DTrait during running time.

Sample Code

Start from test case is always good idea.

object CGroup {
  class C extends DTrait {
    def funC(): String = "function C"
  }
  object C extends DTraitExtractor[C]

  import scala.language.implicitConversions
  implicit def DTrait2C(d: DTrait): C = d.as[C]
}

object DGroup {
  class D extends DTrait {
    def funD(): String = "function D"
  }
  object D extends DTraitExtractor[D]

  import scala.language.implicitConversions
  implicit def DTrait2D(d: DTrait): D = d.as[D]
}

import CGroup._
import DGroup._

val cd: DTrait = (new C).wrap[D]
val dc: DTrait = (new D).wrap[C]

cd.funC shouldBe "function C"
dc.funC shouldBe "function C"

cd.funD shouldBe "function D"
dc.funD shouldBe "function D"

val inputs = List(new C, new D, new D, new C)
val outputs = inputs map {
  case C(c) => c.funC
  case D(d) => d.funD
}

outputs(0) shouldBe "function C"
outputs(1) shouldBe "function D"
outputs(2) shouldBe "function D"
outputs(3) shouldBe "function C"