pub type zinvertv_ker_ft = Option<unsafe extern "C" fn(n: dim_t, x: *mut dcomplex, incx: inc_t, cntx: *mut cntx_t)>;
enum zinvertv_ker_ft { None, Some(unsafe extern "C" fn(_: i64, _: *mut dcomplex, _: i64, _: *mut cntx_s)), }
No value.
Some value of type T.
T