Create a child class's instance in parent class's method

Question

abstract class Parent {
   def filter(p: Parent => Boolean): Parent = filterAcc(p, new Child)
}

class Child extends Parent {
  // ...
}

I am working on Scala tutorial and wondering how the following can be possible.

There are two classes Parent and Child. The Parent class creates an instance of child in the method filter.

How can a parent class refer to a child class which inherits the parent class?

0__ · Accepted Answer · 2016-01-08 00:07:49Z

1

That is no contradiction. If parent and child are defined within the same compilation unit, then the parent can refer to its sub-class, both symbols/types are known to each other.

answered Jan 8, 2016 at 0:07

0__

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