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99 lines
3.6 KiB
99 lines
3.6 KiB
#ifndef _DATE_TIME_TIME_ZONE_BASE__ |
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#define _DATE_TIME_TIME_ZONE_BASE__ |
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/* Copyright (c) 2003-2005 CrystalClear Software, Inc. |
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* Subject to the Boost Software License, Version 1.0. |
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* (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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* Author: Jeff Garland, Bart Garst |
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* $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ |
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*/ |
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#include <string> |
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#include <sstream> |
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namespace boost { |
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namespace date_time { |
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//! Interface class for dynamic time zones. |
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/*! This class represents the base interface for all timezone |
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* representations. Subclasses may provide different systems |
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* for identifying a particular zone. For example some may |
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* provide a geographical based zone construction while others |
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* may specify the offset from GMT. Another possible implementation |
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* would be to convert from POSIX timezone strings. Regardless of |
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* the construction technique, this is the interface that these |
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* time zone types must provide. |
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* |
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* Note that this class is intended to be used as a shared |
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* resource (hence the derivation from boost::counted_base. |
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*/ |
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template<typename time_type, typename CharT> |
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class time_zone_base { |
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public: |
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typedef CharT char_type; |
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typedef std::basic_string<CharT> string_type; |
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typedef std::basic_ostringstream<CharT> stringstream_type; |
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typedef typename time_type::date_type::year_type year_type; |
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typedef typename time_type::time_duration_type time_duration_type; |
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time_zone_base() {}; |
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virtual ~time_zone_base() {}; |
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//!String for the timezone when in daylight savings (eg: EDT) |
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virtual string_type dst_zone_abbrev() const=0; |
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//!String for the zone when not in daylight savings (eg: EST) |
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virtual string_type std_zone_abbrev() const=0; |
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//!String for the timezone when in daylight savings (eg: Eastern Daylight Time) |
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virtual string_type dst_zone_name() const=0; |
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//!String for the zone when not in daylight savings (eg: Eastern Standard Time) |
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virtual string_type std_zone_name() const=0; |
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//! True if zone uses daylight savings adjustments otherwise false |
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virtual bool has_dst() const=0; |
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//! Local time that DST starts -- undefined if has_dst is false |
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virtual time_type dst_local_start_time(year_type y) const=0; |
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//! Local time that DST ends -- undefined if has_dst is false |
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virtual time_type dst_local_end_time(year_type y) const=0; |
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//! Base offset from UTC for zone (eg: -07:30:00) |
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virtual time_duration_type base_utc_offset() const=0; |
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//! Adjustment forward or back made while DST is in effect |
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virtual time_duration_type dst_offset() const=0; |
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//! Returns a POSIX time_zone string for this object |
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virtual string_type to_posix_string() const =0; |
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private: |
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}; |
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//! Structure which holds the time offsets associated with daylight savings time |
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/*! |
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*@param time_duration_type A type used to represent the offset |
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*/ |
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template<class time_duration_type> |
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class dst_adjustment_offsets |
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{ |
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public: |
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dst_adjustment_offsets(const time_duration_type& dst_adjust, |
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const time_duration_type& dst_start_offset, |
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const time_duration_type& dst_end_offset) : |
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dst_adjust_(dst_adjust), |
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dst_start_offset_(dst_start_offset), |
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dst_end_offset_(dst_end_offset) |
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{} |
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//! Amount DST adjusts the clock eg: plus one hour |
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time_duration_type dst_adjust_; |
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//! Time past midnight on start transition day that dst starts |
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time_duration_type dst_start_offset_; |
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//! Time past midnight on end transition day that dst ends |
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time_duration_type dst_end_offset_; |
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}; |
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} } //namespace date_time |
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#endif
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