objc:with-autorelease-pool

(objc:with-autorelease-pool (option*) form*)

Evaluates forms with a fresh autorelease pool and drains it on every exit, non-local ones included, answering the last form's values. options must be empty. 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.

CL-USER> (defun object-description (object)
           (objc:with-autorelease-pool ()
             (objc:invoke-into 'string object "description")))
OBJECT-DESCRIPTION
CL-USER> (object-description (objc:invoke "NSNumber" "numberWithInt:" 42))
"42"