objc:objc-object-copied

(objc:objc-object-copied old-object new-object)

A generic function called when an objc:standard-objc-object is copied through copyWithZone: (copy), with the copy's own Lisp object. The built-in primary method copies the slots; an :after method is the counterpart of implementing copyWithZone:. Not called by the program. Part of the macOS-only objc package -- the interpreter (java -jar, or the rontolisp native binary), a compiled .class / .jar and a --native executable for macOS on Apple silicon, never a .wasm; on a machine without the runtime it signals an error. See the macOS GUI guide.

MY-APP> (defmethod objc-object-copied :after ((old my-object) (new my-object))
          (format t "copied~%"))
OBJC-OBJECT-COPIED
MY-APP> (slot-value (objc-object-from-pointer (invoke (make-instance 'my-object :slot1 :a) "copy")) 'slot1)
copied
:A