Class Box

Examples/NoModules/Chapter 13/Ex13_03/Box.h:6–40

#include <compare>  // For std::partial_ordering (see Chapter 4)

class Box
{
public:
  // Constructors
  Box() = default;
  Box(double l, double w, double h) : m_length{ l }, m_width{ w }, m_height{ h } {}

  double volume() const { return m_length * m_width * m_height; }

  // Accessors
  double getLength() const { return m_length; }
  double getWidth()  const { return m_width; }
  double getHeight() const { return m_height; }

  std::partial_ordering operator<=>(const Box& otherBox) const 
  { 
    return volume() <=> otherBox.volume();
  }
  std::partial_ordering operator<=>(double otherVolume) const 
  { 
    return volume() <=> otherVolume;
  }

  bool operator==(const Box& otherBox) const
  {
    return m_length == otherBox.m_length
        && m_width  == otherBox.m_width
        && m_height == otherBox.m_height; 
  }

private:
  double m_length{ 1.0 };
  double m_width{ 1.0 };
  double m_height{ 1.0 };
};

#endif