slot-makunbound-using-class

Generic Function SLOT-MAKUNBOUND-USING-CLASS

Syntax:

slot-makunbound-using-class class object slot => object

Arguments and values:

class -- A class metaobject. It is the class of the object argument.

object -- An object.

slot -- An effective slot definition metaobject.

Description:

This generic function implements the behavior of theslot-makunbound function. It is called by slot-makunbound with the class of object as its first argument and the pertinent effective slot definition metaobject as its third argument.

The generic function slot-makunbound-using-class restores a slot in an object to its unbound state. The interpretation of ``restoring a slot to its unbound state'' depends on the class metaobject class.

The results are undefined if the class argument is not the class of the object argument, or if the slot argument does not appear among the set of effective slots associated with the class argument.

Methods:

---

slot-makunbound-using-class (class standard-class) object (slot standard-effective-slot-definition) slot-makunbound-using-class (class funcallable-standard-class) object (slot standard-effective-slot-definition) slot-makunbound-using-class (class built-in-class) object slot

Comments and remarks:

In cases where the class metaobject class does not distinguish unbound slots, true should be returned.