Function operator-

Examples/NoModules/Chapter 13/Ex13_07/Integer.h:18–21

  return one.getValue() + other.getValue();
}
inline Integer operator-(const Integer& one, const Integer& other)
{
  return one.getValue() - other.getValue();
}
inline Integer operator*(const Integer& one, const Integer& other)
{
  return one.getValue() * other.getValue();