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