Scala example source code file (t1786.scala)

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Java - Scala tags/keywords

any, application, application, myclass, myclass, someclass, someclass, test, test

The Scala t1786.scala source code

/** This a consequence of the current type checking algorithm, where bounds
 *  are checked only after variables are instantiated. I believe this will change once we go to contraint-based type inference. Assigning low priority until then.
 * 
 *
 */
class SomeClass(val intValue:Int)
class MyClass[T <: SomeClass](val myValue:T) 

object Test extends Application {
  def myMethod(i:MyClass[_]) {
    i.myValue.intValue/2      // << error i is of type Any
  }

  def myMethod(i:MyClass[_ <: SomeClass]) {
    i.myValue.intValue/2      // << works
  }
}
/*
The below code shows a compiler flaw in that the wildcard "_" as value for a bounded type parameter either breaks the boundry - as it result in Any - or doesnt (as id hoped it to be) evaluates to the boundy.
*/