pub unsafe extern "C" fn object_class_property_add_enum(
klass: *mut ObjectClass,
name: *const i8,
typename: *const i8,
strings: *const *const i8,
get: Option<unsafe extern "C" fn(*mut Object, *mut *mut Error) -> i32>,
set: Option<unsafe extern "C" fn(*mut Object, i32, *mut *mut Error)>,
errp: *mut *mut Error,
)