pub type dgemv_vft = Option<unsafe extern "C" fn(transa: trans_t, conjx: conj_t, m: dim_t, n: dim_t, alpha: *const c_void, a: *const c_void, rs_a: inc_t, cs_a: inc_t, x: *const c_void, incx: inc_t, beta: *const c_void, y: *mut c_void, incy: inc_t)>;
