struct cParams {
    iInsertMax: i64,
    iUpdateMax: i64,
    iDeleteMax: i64,
    iInstanceMax: i64,
    tFirstInstance: bool,
    tCreateTables: bool,
    tContinue: bool,
}

impl cParams {
    fn new() -> cParams {
        cParams {
            iInsertMax: -1,
            iUpdateMax: -1,
            iDeleteMax: -1,
            iInstanceMax: -1,
            tFirstInstance: false,
            tCreateTables: false,
            tContinue: false,
        }
    }
}

impl Default for cParams {
  fn default () -> cParams {
    cParams {iInsertMax : -1, iUpdateMax : -1, iDeleteMax : -1, iInstanceMax : -1, tFirstInstance : false, tCreateTables : false, tContinue : false}
  }
}

let p = cParams { iInsertMax: 10, ..Default::default() };

#[derive(Default)]
struct cParams {
  iInsertMax: Option<u64>,
  iUpdateMax: Option<u64>,
  iDeleteMax: Option<u64>,
  iInstanceMax: Option<u64>,
  tFirstInstance: bool,
  tCreateTables: bool,
  tContinue: bool,
}

let p = cParams { iInsertMax: Some(10), ..Default::default() };