9.6.4 Inlining foreign slot access

Given a structure definition

(fli:define-c-struct foo-struct

  (a :int)

  (b :int))

you can inline access to a slot by declaring fli:foreign-slot-value inline and supplying the object-type :

(defun foo-a (struct)

  (declare (inline fli:foreign-slot-value))

  (fli:foreign-slot-value struct 'a :object-type 'foo-struct))