fli:null-pointer-p

(fli:null-pointer-p pointer)

True when the foreign pointer holds address 0. Part of the macOS-only fli package, beside objc -- 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. See the macOS GUI guide.

CL-USER> (fli:null-pointer-p (fli:make-pointer :address 0))
T