CODEWITHSUNDEEP
scala
Vlad the Impala
Vlad the Impala

Reputation: 15872

Inheriting from mutable.Map causes problems

I'm creating a new class where I inherit from mutable.Map:

class Env extends mutable.Map[String, Any] {
  var outer = new mutable.Map[String, Any]
  def get(name: String): Any = if (super.get(name).isEmpty) outer.get(name) else super.get(name)
}

The error I get is:

Test.scala:6: error: method get in trait MapLike is accessed from super. It may not be abstract unless it is overridden by a member declared `abstract' and `override'

Why?

Upvotes: 1

Views: 302

Answers (1)

paradigmatic
paradigmatic

Reputation: 40461

mutable.Map is a trait whose get method is not implemented (ie. abstract).

You should rather extends mutable.HashMap. However, keep in mind that maps get methods return an Option and not directly the stored value.

Upvotes: 3

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