implicits.scala

import collection.mutable
import org.specs2.mutable._

class ImplicitiSpec extends Specification {

  type Store=Map[String,String]

  object Value {

    val store = new mutable.HashMap[String,String] with mutable.SynchronizedMap[String,String]

    def apply(k:String)(implicit map:Store):String=store.getOrElseUpdate(k,applyWithoutLazy(k))

    def applyWithoutLazy(k:String)(implicit map:Store):String={
        println(s"reads value for ${k}")
        map.get(k).getOrElse("")
    }
  }

  trait A{
     def a(implicit store:Store) = Value("a")
  }

  object B extends A

  "An Implicit" should {
    "be propagated " in{      
      implicit val m=Map("a"->"aa")
      B.a === "aa"      
      B.a === "aa"      
      B.a === "aa"      
    }
  }
}