boost/date_time/time_resolution_traits.hpp

   1 #ifndef DATE_TIME_TIME_RESOLUTION_TRAITS_HPP
   2 #define DATE_TIME_TIME_RESOLUTION_TRAITS_HPP
   3
   4 /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
   5  * Use, modification and distribution is subject to the
   6  * Boost Software License, Version 1.0. (See accompanying
   7  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
   8  * Author: Jeff Garland, Bart Garst
   9  * $Date$
  10  */
  11
  12
  13 #include "boost/date_time/time_defs.hpp"
  14 #include "boost/date_time/int_adapter.hpp"
  15 #include "boost/cstdint.hpp"
  16
  17 namespace boost {
  18 namespace date_time {
  19
  20   //! Simple function to calculate absolute value of a numeric type
  21   template <typename T>
  22   // JDG [7/6/02 made a template],
  23   // moved here from time_duration.hpp 2003-Sept-4.
  24   inline T absolute_value(T x)
  25   {
  26     return x < 0 ? -x : x;
  27   }
  28
  29   //! traits struct for time_resolution_traits implementation type
  30   struct time_resolution_traits_bi32_impl {
  31     typedef boost::int32_t int_type;
  32     typedef boost::int32_t impl_type;
  33     static int_type as_number(impl_type i){ return i;}
  34     //! Used to determine if implemented type is int_adapter or int
  35     static bool is_adapted() { return false;}
  36   };
  37   //! traits struct for time_resolution_traits implementation type
  38   struct time_resolution_traits_adapted32_impl {
  39     typedef boost::int32_t int_type;
  40     typedef boost::date_time::int_adapter<boost::int32_t> impl_type;
  41     static int_type as_number(impl_type i){ return i.as_number();}
  42     //! Used to determine if implemented type is int_adapter or int
  43     static bool is_adapted() { return true;}
  44   };
  45   //! traits struct for time_resolution_traits implementation type
  46   struct time_resolution_traits_bi64_impl {
  47     typedef boost::int64_t int_type;
  48     typedef boost::int64_t impl_type;
  49     static int_type as_number(impl_type i){ return i;}
  50     //! Used to determine if implemented type is int_adapter or int
  51     static bool is_adapted() { return false;}
  52   };
  53   //! traits struct for time_resolution_traits implementation type
  54   struct time_resolution_traits_adapted64_impl {
  55     typedef boost::int64_t int_type;
  56     typedef boost::date_time::int_adapter<boost::int64_t> impl_type;
  57     static int_type as_number(impl_type i){ return i.as_number();}
  58     //! Used to determine if implemented type is int_adapter or int
  59     static bool is_adapted() { return true;}
  60   };
  61
  62   template<typename frac_sec_type,
  63            time_resolutions res,
  64 #if (defined(BOOST_MSVC) && (_MSC_VER < 1300))
  65              boost::int64_t resolution_adjust,
  66 #else
  67              typename frac_sec_type::int_type resolution_adjust,
  68 #endif
  69              unsigned short frac_digits,
  70              typename v_type = boost::int32_t >
  71   class time_resolution_traits {
  72   public:
  73     typedef typename frac_sec_type::int_type fractional_seconds_type;
  74     typedef typename frac_sec_type::int_type tick_type;
  75     typedef typename frac_sec_type::impl_type impl_type;
  76     typedef v_type  day_type;
  77     typedef v_type  hour_type;
  78     typedef v_type  min_type;
  79     typedef v_type  sec_type;
  80
  81     // bring in function from frac_sec_type traits structs
  82     static typename frac_sec_type::int_type as_number(typename frac_sec_type::impl_type i)
  83     {
  84       return frac_sec_type::as_number(i);
  85     }
  86     static bool is_adapted()
  87     {
  88       return frac_sec_type::is_adapted();
  89     }
  90
  91     //Would like this to be frac_sec_type, but some compilers complain
  92     BOOST_STATIC_CONSTANT(int, ticks_per_second = resolution_adjust);
  93     //    static const boost::int32_t ticks_per_second = resolution_adjust;
  94
  95     static time_resolutions resolution()
  96     {
  97       return res;
  98     }
  99     static unsigned short num_fractional_digits()
 100     {
 101       return frac_digits;
 102     }
 103     static fractional_seconds_type res_adjust()
 104     {
 105       return resolution_adjust;
 106     }
 107     //! Any negative argument results in a negative tick_count
 108     static tick_type to_tick_count(hour_type hours,
 109                                    min_type  minutes,
 110                                    sec_type  seconds,
 111                                    fractional_seconds_type  fs)
 112     {
 113       if(hours < 0 || minutes < 0 || seconds < 0 || fs < 0)
 114       {
 115         hours = absolute_value(hours);
 116         minutes = absolute_value(minutes);
 117         seconds = absolute_value(seconds);
 118         fs = absolute_value(fs);
 119         return (((((fractional_seconds_type(hours)*3600)
 120                    + (fractional_seconds_type(minutes)*60)
 121                    + seconds)*res_adjust()) + fs) * -1);
 122       }
 123
 124       return (((fractional_seconds_type(hours)*3600)
 125                + (fractional_seconds_type(minutes)*60)
 126                + seconds)*res_adjust()) + fs;
 127     }
 128
 129   };
 130
 131   typedef time_resolution_traits<time_resolution_traits_adapted32_impl, milli, 1000, 3 > milli_res;
 132   typedef time_resolution_traits<time_resolution_traits_adapted64_impl, micro, 1000000, 6 > micro_res;
 133   typedef time_resolution_traits<time_resolution_traits_adapted64_impl, nano,  1000000000, 9 > nano_res;
 134
 135
 136 } } //namespace date_time
 137
 138
 139
 140 #endif