// Ex8_03.cpp
// Exercising the overloaded 'less than' and equality operators
#include <iostream>                      // For stream I/O
using std::cout;
using std::endl;

class CBox                               // Class definition at global scope
{
public:
  // Constructor definition
  explicit CBox(double lv = 1.0, double wv = 1.0, double hv = 1.0) :
    m_Length(lv), m_Width(wv), m_Height(hv)
  {
    cout << "Constructor called." << endl;
  }

  // Function to calculate the volume of a box
  double volume() const
  {
    return m_Length*m_Width*m_Height;
  }

  bool operator<(const CBox& aBox) const;  // Overloaded 'less than'

  // Overloaded equality operator
  bool operator==(const CBox& aBox) const
  {
    return this->volume() == aBox.volume();
  }

  // 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
};

// Operator function for 'less than' that
// compares volumes of CBox objects.
inline bool CBox::operator<(const CBox& aBox) const
{
  return this->volume() < aBox.volume();
}

int main()
{
  const CBox smallBox{ 4.0, 2.0, 1.0 };
  const CBox mediumBox{ 10.0, 4.0, 2.0 };
  CBox bigBox{ 30.0, 20.0, 40.0 };
  CBox thatBox{ 4.0, 2.0, 10.0 };

  if (mediumBox < smallBox)
    cout << "mediumBox is smaller than smallBox" << endl;

  if (mediumBox < bigBox)
    cout << "mediumBox is smaller than bigBox" << endl;
  else
    cout << "mediumBox is not smaller than bigBox" << endl;

  if (thatBox == mediumBox)
    cout << "thatBox is equal to mediumBox" << endl;
  else
    cout << "thatBox is not equal to mediumBox" << endl;

  return 0;
}