Question

i need help with this code.

object test {
  var list : Vector[MyType] = null
}

object foo extends MyType { // Mytype is a trait
    println("TEST ")
    test.list.:+(foo)
    def myfunc() { //need to define this as this is there in the trait
       // i do some operations
     } 
  }


object Bar extends MyType { // Mytype is a trait
    println("TEST ")
    test.list.:+(Bar)
    def myfunc(){
      // i do some operations
    } 
  }

now i want to go through the list and call myfunc() for all the objects that are extending MyType.

test.list foreach( t2 => t2.myfunc() )

the value’s are not getting added to the list. Can someone let me know what i am doing wrong. Its not working. Is there a way to get that print statement working?

Answer 1

Your problem is, that the object is not constructed as a class, so that the code is called automatically. You could do two things. Either you extend App and call main or you write a function.

trait X

object test {
  var list = Vector.empty[X]
}

object Foo extends App with X {
  test.list :+= Foo
  override def toString() = "Foo"
}

object Bar extends X {
  def add() {
    test.list :+= Bar
  }
  override def toString() = "Bar"
}

Foo.main(null)
Bar.add()
test.list foreach println

This code prints:

Foo
Bar

Extending App only adds a main methode to an object, containing all the code in the object.