Built-in Conditions

ABCL distinguishes built-in conditions which it can easily use from the Primitives inside Java and "other" conditions - called Custom Conditions - which the ABCL user defines inside the Lisp environment.

The difference

There is one major difference between built-in conditions and custom conditions:

  • built-in conditions have classes inheriting from the org.armedbear.lisp.Condition class
  • custom conditions are -in the java world- represented using the org.armedbear.lisp.StandardObject? class

Built-in conditions can simply be instantiated in Java using the new operator.

Instantiation of built-in conditions from Lisp

To find the full list of Java classes which mirror a Lisp condition, have a look at This file is being used from clos.lisp to create conditions in the MAKE-CONDITION function. When the function fails to match the condition class passed to it (ie. it returns NIL), it tries to instantiate an object of class StandardObject?.

Last modified 11 years ago Last modified on Oct 26, 2008, 7:40:09 PM