imgtools/imglib/boostlibrary/boost/date_time/time.hpp
author Richard Taylor <richard.i.taylor@nokia.com>
Thu, 03 Dec 2009 14:59:48 +0000
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#ifndef DATE_TIME_TIME_HPP___
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#define DATE_TIME_TIME_HPP___
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/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
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 * Use, modification and distribution is subject to the 
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 * Boost Software License, Version 1.0. (See accompanying
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 * 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: 2008-11-12 14:37:53 -0500 (Wed, 12 Nov 2008) $
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 */
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/*! @file time.hpp
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  This file contains the interface for the time associated classes.
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*/
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#include <string>
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#include <boost/operators.hpp>
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#include <boost/date_time/time_defs.hpp>
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#include <boost/date_time/special_defs.hpp>
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namespace boost {
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namespace date_time {
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  //! Representation of a precise moment in time, including the date.
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  /*! 
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    This class is a skeleton for the interface of a temporal type
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    with a resolution that is higher than a day.  It is intended that 
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    this class be the base class and that the actual time 
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    class be derived using the BN pattern.  In this way, the derived 
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    class can make decisions such as 'should there be a default constructor' 
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    and what should it set its value to, should there be optional constructors
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    say allowing only an time_durations that generate a time from a clock,etc.
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    So, in fact multiple time types can be created for a time_system with
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    different construction policies, and all of them can perform basic
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    operations by only writing a copy constructor.  Finally, compiler 
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    errors are also shorter. 
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    The real behavior of the time class is provided by the time_system
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    template parameter.  This class must provide all the logic
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    for addition, subtraction, as well as define all the interface
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    types.
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  */
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  template <class T, class time_system>
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  class base_time : private
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      boost::less_than_comparable<T
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    , boost::equality_comparable<T
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      > >
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  {
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  public:
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    typedef T time_type;
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    typedef typename time_system::time_rep_type time_rep_type;
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    typedef typename time_system::date_type date_type;
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    typedef typename time_system::date_duration_type date_duration_type;
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    typedef typename time_system::time_duration_type time_duration_type;
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    //typedef typename time_system::hms_type hms_type;
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    base_time(const date_type& day, 
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              const time_duration_type& td, 
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              dst_flags dst=not_dst) :
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      time_(time_system::get_time_rep(day, td, dst))
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    {}
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    base_time(special_values sv) :
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      time_(time_system::get_time_rep(sv))
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    {}
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    base_time(const time_rep_type& rhs) :
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      time_(rhs)
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    {}
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    date_type date() const
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    {
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      return time_system::get_date(time_);
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    }
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    time_duration_type time_of_day() const
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    {
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      return time_system::get_time_of_day(time_);
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    }
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    /*! Optional bool parameter will return time zone as an offset 
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     * (ie "+07:00"). Empty string is returned for classes that do 
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     * not use a time_zone */
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    std::string zone_name(bool /*as_offset*/=false) const
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    {
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      return time_system::zone_name(time_);
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    }
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    /*! Optional bool parameter will return time zone as an offset 
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     * (ie "+07:00"). Empty string is returned for classes that do 
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     * not use a time_zone */
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    std::string zone_abbrev(bool /*as_offset*/=false) const
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    {
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      return time_system::zone_name(time_);
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    }
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    //! An empty string is returned for classes that do not use a time_zone
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    std::string zone_as_posix_string() const
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    {
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      return std::string();
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    }
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    //! check to see if date is not a value
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    bool is_not_a_date_time()  const
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    {
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      return time_.is_not_a_date_time();
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    }
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    //! check to see if date is one of the infinity values
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    bool is_infinity()  const
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    {
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      return (is_pos_infinity() || is_neg_infinity()); 
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    }
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    //! check to see if date is greater than all possible dates
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    bool is_pos_infinity()  const
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    {
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      return time_.is_pos_infinity();
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    }
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    //! check to see if date is greater than all possible dates
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    bool is_neg_infinity()  const
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    {
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      return time_.is_neg_infinity();
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    }
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    //! check to see if time is a special value
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    bool is_special() const
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    {
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      return(is_not_a_date_time() || is_infinity());
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    }
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    //!Equality operator -- others generated by boost::equality_comparable
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    bool operator==(const time_type& rhs) const
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    {
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      return time_system::is_equal(time_,rhs.time_);
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    }
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    //!Equality operator -- others generated by boost::less_than_comparable
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    bool operator<(const time_type& rhs) const
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    {
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      return time_system::is_less(time_,rhs.time_);
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    }
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    //! difference between two times
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    time_duration_type operator-(const time_type& rhs) const
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    {
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      return time_system::subtract_times(time_, rhs.time_);
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    }
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    //! add date durations
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    time_type operator+(const date_duration_type& dd) const
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    {
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      return time_system::add_days(time_, dd);
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    }
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    time_type operator+=(const date_duration_type& dd)
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    {
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      time_ = (time_system::get_time_rep(date() + dd, time_of_day()));
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      return time_type(time_);
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    }
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    //! subtract date durations
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    time_type operator-(const date_duration_type& dd) const
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    {
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      return time_system::subtract_days(time_, dd);
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    }
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    time_type operator-=(const date_duration_type& dd)
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    {
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      time_ = (time_system::get_time_rep(date() - dd, time_of_day()));
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      return time_type(time_);
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    }
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    //! add time durations
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    time_type operator+(const time_duration_type& td) const
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    {
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      return time_type(time_system::add_time_duration(time_, td));
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    }
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    time_type operator+=(const time_duration_type& td)
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    {
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      time_ = (time_system::get_time_rep(date(), time_of_day() + td));
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      return time_type(time_);
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    }
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    //! subtract time durations
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    time_type operator-(const time_duration_type& rhs) const
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    {
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      return time_system::subtract_time_duration(time_, rhs);
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    }
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    time_type operator-=(const time_duration_type& td) 
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    {
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      time_ = (time_system::get_time_rep(date(), time_of_day() - td));
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      return time_type(time_);
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    }
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  protected:
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    time_rep_type time_;
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  };
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} } //namespace date_time::boost
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#endif
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