(defun cpp-edit-toggle-known (arg)
"Toggle writable status for known conditionals.
-With optional argument ARG, make them writable iff ARG is positive."
+With optional argument ARG, make them writable if ARG is positive,
+otherwise make them unwritable."
(interactive "@P")
(if (or (and (null arg) cpp-known-writable)
(<= (prefix-numeric-value arg) 0))
(defun cpp-edit-toggle-unknown (arg)
"Toggle writable status for unknown conditionals.
-With optional argument ARG, make them writable iff ARG is positive."
+With optional argument ARG, make them writable if ARG is positive,
+otherwise make them unwritable."
(interactive "@P")
(if (or (and (null arg) cpp-unknown-writable)
(<= (prefix-numeric-value arg) 0))