slot-unbound
slot-unbound Standard Generic Function
Syntax:
slot-unbound class instance slot-name → {result}*
Method Signatures:
slot-unbound (class t) instance slot-name
Arguments and Values:
class—the class of the instance.
instance—the instance in which an attempt was made to read the unbound slot.
slot-name—the name of the unbound slot.
result—an object.
Description:
The generic function slot-unbound is called when an unbound slot is read in an instance whose metaclass is standard-class. The default method signals an error of type unbound-slot. The name slot of the unbound-slot condition is initialized to the name of the offending variable, and the instance slot of the unbound-slot condition is initialized to the offending instance.
The generic function slot-unbound is not intended to be called by programmers. Programmers may write methods for it. The function slot-unbound is called only indirectly by slot-value.
If slot-unbound returns, only the primary value will be used by the caller, and all other values will be ignored.
Exceptional Situations:
The default method on slot-unbound signals an error of type unbound-slot.
See Also:
slot-makunboundNotes:
An unbound slot may occur if no :initform form was specified for the slot and the slot value has not been set, or if slot-makunbound has been called on the slot.
Expanded Reference: slot-unbound
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(slot-unbound )