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Allegro CL |
ANSI Common Lisp 9
Conditions 9.1 Condition System Concepts 9.1.1 Condition TypesThe next figure lists the standardized condition types. Additional condition types can be defined by using define-condition.
All condition types are subtypes of type condition. That is, (typep c 'condition) true if and only if c is a condition. Implementations must define all specified subtype relationships. Except where noted, all subtype relationships indicated in this document are not mutually exclusive. A condition inherits the structure of its supertypes. The metaclass of the class condition is not specified. Names of condition types may be used to specify supertype relationships in define-condition, but the consequences are not specified if an attempt is made to use a condition type as a superclass in a defclass form. The next figure shows operators that define condition types and creating conditions.
The next figure shows operators that read the value of condition slots.
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