...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::date_time::gregorian_calendar_base — An implementation of the Gregorian calendar.
// In header: <boost/date_time/gregorian_calendar.hpp> template<typename ymd_type_, typename date_int_type_> class gregorian_calendar_base { public: // types typedef ymd_type_ ymd_type; // define a type a date split into components typedef ymd_type::month_type month_type; // define a type for representing months typedef ymd_type::day_type day_type; // define a type for representing days typedef ymd_type::year_type year_type; // Type to hold a stand alone year value (eg: 2002) typedef date_int_type_ date_int_type; // Define the integer type to use for internal calculations. // public static functions static unsigned short day_of_week(const ymd_type &); static int week_number(const ymd_type &); static date_int_type day_number(const ymd_type &); static date_int_type julian_day_number(const ymd_type &); static date_int_type modjulian_day_number(const ymd_type &); static ymd_type from_day_number(date_int_type); static ymd_type from_julian_day_number(date_int_type); static ymd_type from_modjulian_day_number(date_int_type); static bool is_leap_year(year_type); static unsigned short end_of_month_day(year_type, month_type); static ymd_type epoch(); static unsigned short days_in_week(); };
This is a parameterized implementation of a proleptic Gregorian Calendar that can be used in the creation of date systems or just to perform calculations. All the methods of this class are static functions, so the intent is to never create instances of this class.
gregorian_calendar_base
public static functionsstatic unsigned short day_of_week(const ymd_type & ymd);
static int week_number(const ymd_type & ymd);
static date_int_type day_number(const ymd_type & ymd);
static date_int_type julian_day_number(const ymd_type & ymd);
static date_int_type modjulian_day_number(const ymd_type & ymd);
static ymd_type from_day_number(date_int_type);
static ymd_type from_julian_day_number(date_int_type);
static ymd_type from_modjulian_day_number(date_int_type);
static bool is_leap_year(year_type);
static unsigned short end_of_month_day(year_type y, month_type m);
static ymd_type epoch();
static unsigned short days_in_week();