Method operator -

code/mathematics/intx.cpp:55–56

                         : data[i] > b.data[i];
    return false; }
  intx operator -() const {
    intx res(*this); res.sign *= -1; return res; }
  friend intx abs(const intx &n) { return n < 0 ? -n : n; }
  intx operator +(const intx& b) const {
    if (sign > 0 && b.sign < 0) return *this - (-b);