source: NonGTP/Boost/boost/date_time/time_resolution_traits.hpp @ 857

Revision 857, 5.1 KB checked in by igarcia, 19 years ago (diff)
Line 
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 or http://www.boost.org/LICENSE-1.0)
8 * Author: Jeff Garland, Bart Garst
9 * $Date: 2003/12/03 03:01:05 $
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
17namespace boost {
18namespace 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 <= 1200))  // 1200 == VC++ 6.0
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      else{
124        return (((fractional_seconds_type(hours)*3600)
125                 + (fractional_seconds_type(minutes)*60)
126                 + seconds)*res_adjust()) + fs;
127      }
128    }
129   
130  };
131
132  typedef time_resolution_traits<time_resolution_traits_adapted32_impl, milli, 1000, 3 > milli_res;
133  typedef time_resolution_traits<time_resolution_traits_adapted64_impl, micro, 1000000, 6 > micro_res;
134  typedef time_resolution_traits<time_resolution_traits_adapted64_impl, nano,  1000000000, 9 > nano_res;
135
136
137} } //namespace date_time
138
139
140
141#endif
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