pub type VipsSListMap4Fn = Option<unsafe extern "C" fn(item: *mut c_void, a: *mut c_void, b: *mut c_void, c: *mut c_void, d: *mut c_void) -> *mut c_void>;Aliased Type§
pub enum VipsSListMap4Fn {
None,
Some(unsafe extern "C" fn(*mut c_void, *mut c_void, *mut c_void, *mut c_void, *mut c_void) -> *mut c_void),
}