pub unsafe extern "C" fn gsl_integration_qk( n: c_int, xgk: *const f64, wg: *const f64, wgk: *const f64, fv1: *mut f64, fv2: *mut f64, f: *const gsl_function, a: f64, b: f64, result: *mut f64, abserr: *mut f64, resabs: *mut f64, resasc: *mut f64)
