Function CPXgetcallbackorder 

pub unsafe extern "C" fn CPXgetcallbackorder(
    env: CPXCENVptr,
    cbdata: *mut c_void,
    wherefrom: c_int,
    priority: *mut c_int,
    direction: *mut c_int,
    begin: c_int,
    end: c_int,
) -> c_int