CODEWITHSUNDEEP
scala
Ramón J Romero y Vigil
Ramón J Romero y Vigil

Reputation: 17933

Accessing a Scala Trait method inside another method

I am writing a trait that contains a function:

trait MyTrait[X,Y] {
  def f(x : X) : Y
}

I'm trying to add a map function:

trait MyTrait[X,Y] {
  def f(x : X) : Y // the outer f

  def map[Z](g : Y => Z) : MyTrait[X,Y] = MyTrait[X,Z] {
    //namespace conflict : I need to access the outer f within this f
    override def f(x : X) : Z = outerF andThen g  
  }
}

My question is: how do I reference the outer f? I've tried super.f and this.f to no avail. I'm sure this is a basic question that has been asked before but it's not very "google-able", e.g. easy to search for.

thank you in advance for your consideration and response.

Upvotes: 1

Views: 47

Answers (2)

Alexey Romanov
Alexey Romanov

Reputation: 170733

You can also use override def f(x : X) : Z = MyTrait.this.f andThen g.

Upvotes: 1

Nagarjuna Pamu
Nagarjuna Pamu

Reputation: 14825

You can use self type

trait MyTrait[X,Y] {
  self => 
  def f(x : X) : Y // the outer f

  def map[Z](g : Y => Z) : MyTrait[X,Y] = MyTrait[X,Z] {
    override def f(x : X) : Z = self.f andThen g  
  }
}

Upvotes: 2

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