Base Class R←⎕BASE.Y

⎕BASE is used to access the base class implementation of the name specified by Y.

Y must be the name of a Public member (Method, Field or Property) that is provided by the Base Class of the current Class or Instance.

⎕BASE is typically used to call a method in the Base Class which has been superseded by a Method in the current Class.

Note that ⎕BASE.Y is special syntax and any direct reference to ⎕BASE on its own or in any other context, is meaningless and causes SYNTAX ERROR.

In the following example, Class DomesticParrot derives from Class Parrot and supersedes its Speak method. DomesticParrot.Speak calls the Speak method in its Base Class Parrot, via ⎕BASE.

:Class Parrot: Bird
    ∇ R←Speak
      :Access Public
      R←'Squark!'
    ∇
:EndClass ⍝ Parrot

:Class DomesticParrot: Parrot
    ∇ R←Speak
      :Access Public
      R←⎕BASE.Speak,' Who''s a pretty boy, then!'
    ∇
:EndClass ⍝ DomesticParrot

      Maccaw←⎕NEW Parrot
      Maccaw.Speak
Squark!

      Polly←⎕NEW DomesticParrot
      Polly.Speak
Squark! Who's a pretty boy, then!