// Ex8_04.cpp
  // Implementing a complete overloaded 'greater than' operator
  include <iostream>                    // For stream I/O
  using std::cout;
  using std::endl;
  
  class CBox                             // Class definition at global scope
  {
    public:
      // Constructor definition
      CBox(double lv = 1.0, double wv = 1.0, double hv = 1.0):
                              m_Length(lv), m_Width(wv), m_Height(hv)
      {
        cout << endl << "Constructor called.";
      }
  
      // Function to calculate the volume of a box
      double Volume() const
      {
        return m_Length*m_Width*m_Height;
      }
  
      // Operator function for 'greater than' that
      // compares volumes of CBox objects.
      bool operator>(const CBox& aBox) const
      {
        return this->Volume() > aBox.Volume();
      }
  
      // Function to compare a CBox object with a constant
      bool operator>(const double& value) const
      {
        return this->Volume() > value;
      }
  
      // Destructor definition
      ~CBox()
      { cout << "Destructor called." << endl;}
  
    private:
      double m_Length;                   // Length of a box in inches
      double m_Width;                    // Width of a box in inches
      double m_Height;                   // Height of a box in inches
  };
  
  int operator>(const double& value, const CBox& aBox); // Function prototype
  
  int main()
  {
    CBox smallBox(4.0, 2.0, 1.0);
    CBox mediumBox(10.0, 4.0, 2.0);
  
    if(mediumBox > smallBox)
      cout << endl
           << "mediumBox is bigger than smallBox";
  
    if(mediumBox > 50.0)
      cout << endl
           << "mediumBox capacity is more than 50";
    else
      cout << endl
           << "mediumBox capacity is not more than 50";
  
    if(10.0 > smallBox)
      cout << endl
           << "smallBox capacity is less than 10";
    else
      cout << endl
           << "smallBox capacity is not less than 10";
  
    cout << endl;
    return 0;
  }
  
  // Function comparing a constant with a CBox object
  int operator>(const double& value, const CBox& aBox)
  {
    return value > aBox.Volume();
  }