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

Revision 857, 2.2 KB checked in by igarcia, 19 years ago (diff)
Line 
1#ifndef DATE_CLOCK_DEVICE_HPP___
2#define DATE_CLOCK_DEVICE_HPP___
3
4/* Copyright (c) 2002,2003,2005 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: 2005/03/19 21:39:59 $
10 */
11
12#include "boost/date_time/c_time.hpp"
13
14
15namespace boost {
16namespace date_time {
17
18  //! A clock providing day level services based on C time_t capabilities
19  /*! This clock uses Posix interfaces as its implementation and hence
20   *  uses the timezone settings of the operating system.  Incorrect
21   *  user settings will result in incorrect results for the calls
22   *  to local_day.
23   */
24  template<class date_type>
25  class day_clock
26  {
27  public:
28    typedef typename date_type::ymd_type ymd_type;
29    //! Get the local day as a date type
30    static date_type local_day()
31    {
32      return date_type(local_day_ymd());
33    }
34    //! Get the local day as a ymd_type
35    static typename date_type::ymd_type local_day_ymd()
36    {
37      ::std::tm result;
38      ::std::tm* curr = get_local_time(result);
39      return ymd_type(curr->tm_year + 1900,
40                      curr->tm_mon + 1,
41                      curr->tm_mday);
42    }
43    //! Get the current day in universal date as a ymd_type
44    static typename date_type::ymd_type universal_day_ymd()
45    {
46      ::std::tm result;
47      ::std::tm* curr = get_universal_time(result);
48      return ymd_type(curr->tm_year + 1900,
49                      curr->tm_mon + 1,
50                      curr->tm_mday);
51    }
52    //! Get the UTC day as a date type
53    static date_type universal_day()
54    {
55      return date_type(universal_day_ymd());
56    }
57
58  private:
59    static ::std::tm* get_local_time(std::tm& result)
60    {
61      ::std::time_t t;
62      ::std::time(&t);
63      return c_time::localtime(&t, &result);
64    }
65    static ::std::tm* get_universal_time(std::tm& result)
66    {
67      ::std::time_t t;
68      ::std::time(&t);
69      return c_time::gmtime(&t, &result);
70    }
71
72  };
73
74} } //namespace date_time
75
76
77#endif
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