Code Capsules

Listing 2 date.h: defines a simple Date class

// Forward declarations
class istream;
class ostream;

class Date
{
public:
   // Constructors
   Date();
   Date(int m, int d, int y);
   
   // Accessor Functions
   int month() const;
   int month(int);
   int day() const;
   int day(int);
   int year() const;
   int year(int);
   
   // Relational operators
   int operator<(const Date& d2) const;
   int operator<=(const Date& d2) const;
   int operator>(const Date& d2) const;
   int operator>=(const Date& d2) const;
   int operator==(const Date& d2) const;
   int operator!=(const Date& d2) const;
   
   // Stream I/O operators
   friend ostream& operator<<(ostream&, const Date&);
   friend istream& operator>>(istream&, Date&);
   
   static int isleap(int y);
   
private:
   
   int month_;
   int day_;
   int year_;
   
   static int dtab[2][13];
   static int compare(const Date&, const Date&);
};

inline int Date::month() const
{
   return month_;
}

inline int Date::day() const
{
   return day_;
}

inline int Date::year() const
{
   return year_;
}

inline Date::Date(int m, int d, int y)
{
   month_ = m;
   day_ = d;
   year_ = y;
}

inline int Date::isleap(int y)
{
   return y%4 == 0 && y%100 != || y%400 == 0;
}

inline int Date::operator<(const Date& d2) const
{
   return compare(*this,d2) < 0;
}

inline int Date::operator>(const Date& d2) const
{
   return compare(*this.d2) > 0;
}

inline int Date::operator<=(const Date& d2) const
{
   return compare(*this,d2) <= 0;
}

inline int Date::operator>=(const Date& d2) const
{
   return compare(*this,d2) >= 0;
}

inline int Date::operator==(const Date& d2) const
{
   return compare(*this,d2) == 0;
}

inline int Date::operator!=(const Date& d2) const
{
   return compare(*this,d2) != 0;
}

// End of File