# Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Public Types | Public Member Functions

# boost::locale::abstract_calendar Class Reference

`#include <boost/locale/date_time_facet.hpp>`

List of all members.

## Public Types
enum | value_type { absolute_minimum, actual_minimum, greatest_minimum, current, least_maximum, actual_maximum, absolute_maximum }
enum | update_type { move, roll }
enum | calendar_option_type { is_gregorian, is_dst }
## Public Member Functions
virtual abstract_calendar * | clone () const =0
virtual void | set_value (period::marks::period_mark p, int value)=0
virtual void | normalize ()=0
virtual int | get_value (period::marks::period_mark p, value_type v) const =0
virtual void | set_time (posix_time const &p)=0
virtual posix_time | get_time () const =0
virtual void | set_option (calendar_option_type opt, int v)=0
virtual int | get_option (calendar_option_type opt) const =0
virtual void | adjust_value (period::marks::period_mark p, update_type u, int difference)=0
virtual int | difference (abstract_calendar const *other, period::marks::period_mark p) const =0
virtual void | set_timezone (std::string const &tz)=0
virtual std::string | get_timezone () const =0
virtual bool | same (abstract_calendar const *other) const =0

## Detailed Description

This class defines generic calendar class, it is used by date_time and calendar objects internally. It is less useful for end users, but it is build for localization backend implementation

## Member Enumeration Documentation

enum boost::locale::abstract_calendar::calendar_option_type

Information about calendar

Enumerator:

  is_gregorian | Check if the calendar is Gregorian.
  is_dst | Check if the current time is in daylight time savings.

enum boost::locale::abstract_calendar::update_type

A way to update the value

Enumerator:

  move | Change the value up or down effecting others for example 1990-12-31 + 1 day = 1991-01-01.
  roll | Change the value up or down not effecting others for example 1990-12-31 + 1 day = 1990-12-01.

enum boost::locale::abstract_calendar::value_type

Type that defines how to fetch the value

Enumerator:

  absolute_minimum | Absolute possible minimum for the value, for example for day is 1.
  actual_minimum | Actual minimal value for this period.
  greatest_minimum | Maximal minimum value that can be for this period.
  current | Current value of this period.
  least_maximum | The last maximal value for this period, For example for Gregorian calendar day it is 28
  actual_maximum | Actual maximum, for it can be 28, 29, 30, 31 for day according to current month.
  absolute_maximum | Maximal value, for Gregorian day it would be 31.

## Member Function Documentation

virtual void boost::locale::abstract_calendar::adjust_value | ( | period::marks::period_mark | p,
|  | update_type | u,
|  | int | difference |
| ) |  |  | `[pure virtual]`

Adjust period's p value by difference items using a update_type u. Note: not all values are adjustable

virtual abstract_calendar* boost::locale::abstract_calendar::clone | ( |  | ) | const`[pure virtual]`

Make a polymorphic copy of the calendar

virtual int boost::locale::abstract_calendar::difference | ( | abstract_calendar const * | other,
|  | period::marks::period_mark | p |
| ) |  |  | const`[pure virtual]`

Calculate the difference between this calendar and other in p units

virtual int boost::locale::abstract_calendar::get_option | ( | calendar_option_type | opt | ) | const`[pure virtual]`

Get option for calendar, currently only check if it is Gregorian calendar

virtual posix_time boost::locale::abstract_calendar::get_time | ( |  | ) | const`[pure virtual]`

Get current time point

virtual std::string boost::locale::abstract_calendar::get_timezone | ( |  | ) | const`[pure virtual]`

Get current time zone, empty - system one

virtual int boost::locale::abstract_calendar::get_value | ( | period::marks::period_mark | p,
|  | value_type | v |
| ) |  |  | const`[pure virtual]`

Get specific value for period p according to a value_type v

virtual void boost::locale::abstract_calendar::normalize | ( |  | ) | `[pure virtual]`

Recalculate all periods after setting them, should be called after use of set_value() function.

virtual bool boost::locale::abstract_calendar::same | ( | abstract_calendar const * | other | ) | const`[pure virtual]`

Check of two calendars have same rules

virtual void boost::locale::abstract_calendar::set_option | ( | calendar_option_type | opt,
|  | int | v |
| ) |  |  | `[pure virtual]`

Set option for calendar, for future use

virtual void boost::locale::abstract_calendar::set_time | ( | posix_time const & | p | ) | `[pure virtual]`

Set current time point

virtual void boost::locale::abstract_calendar::set_timezone | ( | std::string const & | tz | ) | `[pure virtual]`

Set time zone, empty - use system

virtual void boost::locale::abstract_calendar::set_value | ( | period::marks::period_mark | p,
|  | int | value |
| ) |  |  | `[pure virtual]`

Set specific value for period p, note not all values are settable.

After call of set_value you may want to call normalize() function to make sure vall periods are updated, if you set sereral fields that are part of single date/time representation you should call set_value several times and then call normalize().

If normalize() is not called after set_value, the behavior is undefined

The documentation for this class was generated from the following file:

- boost/locale/date_time_facet.hpp