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interface IDataSaver(){
    int Save();
}

class InternetSaver : IDataSaver{
     String dataToSave;
    Int Save(){
        // 1.  Http write dataToSave to URL;
       //. 2. Return 0 - success
    }
}

class FileSaver : IDataSaver{
     String dataToSave;
    Int Save(){
        // 1.  File write dataToSave to FILE;
       //. 2. Return 0 - success
    }
}

class DBSaver : IDataSaver{
     String dataToSave;
    Int Save(){
        // 1.  write dataToSave to DATABASE;
       //. 2. Return 0 - success
    }
}

// driver
List<IDataSaver> allDataSavers  = new List<IDataSaver>();
allDataSavers.Add(new InternetSaver());
allDataSavers.Add(new FileSaver());
allDataSavers.Add(new DBSaver());

foreach (IDataSaver ds in allDataSavers){
    ds.Save(); /// no need to determine type (no switch) bec all implement Save()
}

CPallini wrote:

Imagine the class diagram

void Random__METHOD()
{
    static const int last_case = 96;
      // Random Number Generator
    auto _case_ = m_cSCALAR_RNG.operator() < int > (0, last_case);
        switch(_case_)
        {
        default: throw einternal_error_eXception;
        case 0: Random__default_constructor(); break;
        case 1: Random__primordialTimePoint(); break;
        case 2: Random__DIAGNOSTIC_SNAPSHOT_HASH(); break;
        case 3: Random__recordTermination_time_point_node_spec();
        case 4: Random__open_with_arguments(); break;
        case 5: Random__open(); break;
        case 6: Random__close(); break;
        case 7: Random__is_open(); break;
        case 8: Random__set_toNascentState(); break;
        case 10: Random__swap(); break;
        case 11: Random__startTransaction(); break;
        case 12: Random__endTransaction();  break;
        case 13: Random__cancelTransaction(); break;
        case 14: Random__is_activeTransaction(); break;
        case 15: Random__activeTransaction_ctransaction_datum(); break;
        case 16: Random__is_saved(); break;
        case 17: Random__save(); break;
        case 18: Random__offset(); break;
        case 19: Random__size(); break;
        case 20: Random__eofOffset(); break;
        case 21: Random__mirror(); break;
        case 22: Random__archivesPaths(); break;
        case 23: Random__archivesFilenames(); break;
        case 24: Random__fullPath(); break;
        case 25: Random__fileName(); break;
        case 26: if(m_rfe) {} break;
        case 27: if(!m_rfe) {} break;
        case 28: m_rfe == m_rfe; break;
        case 29: m_rfe != m_rfe; break;
        case 30: Random__read(); break;
        case 31: Random__output(); break;
        case 32: Random__delete(); break;
        case 33: Random__setOffset(); break;
        case 34: Random__incOffset(); break;
        case 35: Random__decOffset(); break;
        case 36: Random__adjust_eofOffset(); break;
        case 37: Random__set_eofOffset(); break;
        case 38: Random__initializedIntervals(); break;
        case 39: Random__uninitializedIntervals(); break;
        case 40: Random__treeEmpty(); break;
        case 41: Random__treeSize(); break;
        case 42: Random__number_ofUndosAvailable(); break;
        case 43: Random__undo(); break;
        case 44: Random__redo(); break;
        case 45: Random__number_ofRedoBranches(); break;
        case 46: Random__undo_node_spec_time_point(); break;
        case 47: Random__undo_node_spec_ctransaction_datum(); break;
        case 48: Random__undo_node_spec_time_point_vector_cedit_datum(); break;
        case 49: Random__redo_node_spec_time_point(); break;
        case 50: Random__redo_node_spec_ctransaction_datum(); break;
        case 51: Random__redo_node_spec_time_point_vector_cedit_datum(); break;
        case 52: Random__redo_node_spec_ctransaction_datum_all(); break;
        case 53: Random__current_root_node_spec_time_point(); break;
        case 54: Random__current_root_node_spec_ctransaction_datum(); break;
        case 55: Random__current_root_node_spec_time_point_vector_cedit_datum(); break;
        case 56: Random__terminus_node_spec_time_point(); break;
        case 57: Random__terminus_node_spec_ctransaction_datum(); break;
        case 58: Random__terminus_node_spec_time_point_vector_cedit_datum(); break;
        case 59: Random__current_node_spec_time_point(); break;
        case 60: Random__currentSessionIdentifier(); break;
        case 61: Random__LIST_per_predicate(); break;
        case 62: Random__REMOVE_per_list(); break;
        case 63: Random__REMOVE_undos(); break;
        case 64: Random__REMOVE_undo_branches(); break;
        case 65: Random__REMOVE_redos(); break;
        case 66: Random__REMOVE_sub_tree(); break;
        case 67: Random__REMOVE_per_list(); break;
        case 68: Random__REMOVE_undos(); break;
        case 69: Random__REMOVE_undo_branches(); break;
        case 70: Random__REMOVE_redos(); break;
        case 71: Random__REMOVE_sub_tree(); break;
        case 72:Random__NAVIGATE_to_nil_root(); break;
        case 73:Random__NAVIGATE_to_root(); break;
        case 74:Random__NAVIGATE_to_root_branch(); break;
        case 75:Random__NAVIGATE_branch(); break;
        case 76:Random__NAVIGATE_forward_route(); break;
        case 77:Random__NAVIGATE_backward_route(); break;
        case 78:Random__NAVIGATE_to_node_spec(); break;
        case 79:Random__NAVIGATE_to_node_spec_root(); break;
        case 80:Random__NAVIGATE_to_node_spec_branch(); break;
        case 81:Random__NAVIGATE_to_node_spec_forward_route_terminus(); break;
        case 82:Random__NAVIGATE_to_node_spec_backward_route_terminus(); break;
        case 83:Random__NAVIGATE_to_canonical_route_terminus(); break;
        case 84:Random__STEP_to_nil_root(); break;
        case 85:Random__STEP_to_root(); break;
        case 86:Random__STEP_to_root(); break;
        case 87:Random__STEP_branch(); break;
        case 88:Random__STEP_forward_route(); break;
        case 89:Random__STEP_backward_route(); break;
        case 90:Random__STEP_to_node_spec(); break;
        case 91:Random__STEP_to_node_spec_root(); break;
        case 92:Random__STEP_to_node_spec_branch(); break;
        case 93:Random__STEP_to_node_spec_forward_route_terminus(); break;
        case 94:Random__STEP_to_node_spec_backward_route_terminus(); break;
        case 95:Random__STEP_to_canonical_route_terminus(); break;
        case 96:Random__delete__count(); break;
        }
}