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/Src/Dependencies/Boost/boost/date_time/gregorian/conversion.hpp

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C++ Header | 68 lines | 50 code | 9 blank | 9 comment | 2 complexity | fff0a44694ea6f6e61e85e70e248cf4f MD5 | raw file
 1#ifndef _GREGORIAN__CONVERSION_HPP___
 2#define _GREGORIAN__CONVERSION_HPP___
 3
 4/* Copyright (c) 2004-2005 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.txt or http://www.boost.org/LICENSE_1_0.txt)
 8 * Author: Jeff Garland, Bart Garst
 9 * $Date: 2010-06-10 04:10:13 +1000 (Thu, 10 Jun 2010) $
10 */
11
12#include <cstring>
13#include <string>
14#include <stdexcept>
15#include <boost/throw_exception.hpp>
16#include <boost/date_time/c_time.hpp>
17#include <boost/date_time/special_defs.hpp>
18#include <boost/date_time/gregorian/gregorian_types.hpp>
19
20namespace boost {
21
22namespace gregorian {
23
24  //! Converts a date to a tm struct. Throws out_of_range exception if date is a special value
25  inline
26  std::tm to_tm(const date& d)
27  {
28    if (d.is_special())
29    {
30        std::string s = "tm unable to handle ";
31        switch (d.as_special())
32        {
33        case date_time::not_a_date_time:
34            s += "not-a-date-time value"; break;
35        case date_time::neg_infin:
36            s += "-infinity date value"; break;
37        case date_time::pos_infin:
38            s += "+infinity date value"; break;
39        default:
40            s += "a special date value"; break;
41        }
42        boost::throw_exception(std::out_of_range(s));
43    }
44
45    std::tm datetm;
46    std::memset(&datetm, 0, sizeof(datetm));
47    boost::gregorian::date::ymd_type ymd = d.year_month_day();
48    datetm.tm_year = ymd.year - 1900;
49    datetm.tm_mon = ymd.month - 1;
50    datetm.tm_mday = ymd.day;
51    datetm.tm_wday = d.day_of_week();
52    datetm.tm_yday = d.day_of_year() - 1;
53    datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst
54    return datetm;
55  }
56
57  //! Converts a tm structure into a date dropping the any time values.
58  inline
59  date date_from_tm(const std::tm& datetm)
60  {
61    return date(static_cast<unsigned short>(datetm.tm_year+1900),
62                static_cast<unsigned short>(datetm.tm_mon+1),
63                static_cast<unsigned short>(datetm.tm_mday));
64  }
65
66} } //namespace boost::gregorian
67
68#endif