A object of type standard-objc-object.
A foreign pointer or
returns the value of the instance variable
in the Objective-C foreign object associated with
. The type of
depends on the declared type of the instance variable. If this type is a foreign structure type, then the
argument should be passed giving a pointer to a foreign object of the correct type that is filled with the value.
Note that it is only possible to access instance variables that are defined in Lisp by define-objc-class, not those inherited from superclasses implemented in Objective-C.
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 15 Dec 2011