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Diffstat (limited to 'src/main/scala/Main.scala')
-rw-r--r-- | src/main/scala/Main.scala | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/main/scala/Main.scala b/src/main/scala/Main.scala new file mode 100644 index 0000000..c19d3ec --- /dev/null +++ b/src/main/scala/Main.scala @@ -0,0 +1,58 @@ +package macros + +import scala.collection.immutable.Map + +object Test extends App { + + sealed trait JsValue + case class JsObject(fields: Map[String, JsValue]) extends JsValue + case class JsString(str: String) extends JsValue + case class JsNumber(num: Int) extends JsValue + + trait MyWriter[A] { + def write(value: A): JsValue + def other(a: A): Int = 2 + } + trait BaseWriters { + implicit val idWriter = new MyWriter[JsValue] { + def write(value: JsValue) = value + } + implicit val intWriter = new MyWriter[Int] { + def write(value: Int) = JsNumber(value) + } + implicit val stringWriter = new MyWriter[String] { + def write(value: String) = JsString(value) + } + } + trait CompositeWriters { + implicit def mapWriter[A: MyWriter] = new MyWriter[Map[String, A]] { + def write(mp: Map[String, A]) = { + def writeA(v: A) = implicitly[MyWriter[A]].write(v) + JsObject(mp.map { case (k, v) => k -> writeA(v) }) + } + } + } + + object Util { + def save[A: MyWriter](a: A): Unit = { + val x = implicitly[MyWriter[A]].write(a) + println("saving " + x) + } + } + + case class Foo(x: Int) + case class Composite(x: Int, y: String, other: Foo) + + object Protocol + extends BaseWriters + with CompositeWriters + with ProductWriters[MyWriter] + import Protocol._ + + class Bar + Util.save(2) + //Util.save(new Bar) + Util.save(Composite(2, "some string", Foo(3))) + //Util.save((2, "some string", "1") + +} |