pub type ddotxf_ft = Option<unsafe extern "C" fn(conjat: conj_t, conjx: conj_t, m: dim_t, b_n: dim_t, alpha: *const f64, a: *const f64, inca: inc_t, lda: inc_t, x: *const f64, incx: inc_t, beta: *const f64, y: *mut f64, incy: inc_t)>;
