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