objc:call-objc-block

(objc:call-objc-block type block &rest args)

Calls a block -- one objc:make-objc-block made, a block object a method answered, or an address -- on the calling thread, with args converted by type (the designator objc:make-objc-block takes) and the result converted back. A block does not reliably carry its own signature, so the caller states it. 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> (call-objc-block '(:int (:int :int)) *add* 3 4)
7