Function gsl_sys::gsl_integration_qag

pub unsafe extern "C" fn gsl_integration_qag(
    f: *const gsl_function, 
    a: f64, 
    b: f64, 
    epsabs: f64, 
    epsrel: f64, 
    limit: usize, 
    key: c_int, 
    workspace: *mut gsl_integration_workspace, 
    result: *mut f64, 
    abserr: *mut f64
) -> c_int