pub type dtrmv_ex_ft = Option<unsafe extern "C" fn(uploa: uplo_t, transa: trans_t, diaga: diag_t, m: dim_t, alpha: *const f64, a: *const f64, rs_a: inc_t, cs_a: inc_t, x: *mut f64, incx: inc_t, cntx: *const cntx_t, rntm: *mut rntm_t)>;
