pub type dotv_ex_vft = Option<unsafe extern "C" fn(conjx: conj_t, conjy: conj_t, n: dim_t, x: *const c_void, incx: inc_t, y: *const c_void, incy: inc_t, rho: *mut c_void, cntx: *const cntx_t, rntm: *mut rntm_t)>;
