pub type seqsc_ft = Option<unsafe extern "C" fn(conjchi: conj_t, chi: *mut f32, psi: *mut f32, is_eq: *mut bool)>;
enum seqsc_ft { None, Some(unsafe extern "C" fn(_: u32, _: *mut f32, _: *mut f32, _: *mut bool)), }
No value.
Some value of type T.
T