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

Revision 857, 3.7 KB checked in by igarcia, 19 years ago (diff)
Line 
1
2#ifndef DATETIME_SPECIAL_VALUE_FORMATTER_HPP___
3#define DATETIME_SPECIAL_VALUE_FORMATTER_HPP___
4
5/* Copyright (c) 2004 CrystalClear Software, Inc.
6 * Use, modification and distribution is subject to the
7 * Boost Software License, Version 1.0. (See accompanying
8 * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
9 * Author: Jeff Garland
10 * $Date: 2005/05/03 14:27:51 $
11 */
12
13#include <vector>
14#include <string>
15#include "boost/date_time/special_defs.hpp"
16
17namespace boost { namespace date_time {
18
19
20  //! Class that provides generic formmatting ostream formatting for special values
21  /*! This class provides for the formmating of special values to an output stream.
22   *  In particular, it produces strings for the values of negative and positive
23   *  infinity as well as not_a_date_time. 
24   *
25   *  While not a facet, this class is used by the date and time facets for formatting
26   *  special value types.
27   *
28   */
29  template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > >
30  class special_values_formatter 
31  {
32  public:
33    typedef std::basic_string<CharT> string_type;
34    typedef CharT                    char_type;
35    typedef std::vector<string_type> collection_type;
36    static const char_type default_special_value_names[3][17];
37
38    //! Construct special values formatter using default strings.
39    /*! Default strings are not-a-date-time -infinity +infinity
40     */
41    special_values_formatter()
42    {
43      std::copy(&default_special_value_names[0],
44                &default_special_value_names[3],
45                std::back_inserter(m_special_value_names));     
46    }
47
48    //! Construct special values formatter from array of strings
49    /*! This constructor will take pair of iterators from an array of strings
50     *  that represent the special values and copy them for use in formatting
51     *  special values. 
52     *@code
53     *  const char* const special_value_names[]={"nadt","-inf","+inf" };
54     *
55     *  special_value_formatter svf(&special_value_names[0], &special_value_names[3]);
56     *@endcode
57     */
58    special_values_formatter(const char_type* const* begin, const char_type* const* end)
59    {
60      std::copy(begin, end, std::back_inserter(m_special_value_names));
61    }
62    special_values_formatter(typename collection_type::iterator beg, typename collection_type::iterator end)
63    {
64      std::copy(beg, end, std::back_inserter(m_special_value_names));
65    }
66
67    OutItrT put_special(OutItrT next,
68                        const boost::date_time::special_values& value) const
69    {
70     
71      unsigned int index = value;
72      if (index < m_special_value_names.size()) {
73        std::copy(m_special_value_names[index].begin(),
74                  m_special_value_names[index].end(),
75                  next);
76      }
77      return next;
78    }
79  protected:
80    collection_type m_special_value_names;
81  };
82
83  //! Storage for the strings used to indicate special values
84  /* using c_strings to initialize these worked fine in testing, however,
85   * a project that compiled its objects separately, then linked in a separate
86   * step wound up with redefinition errors for the values in this array.
87   * Initializing individual characters eliminated this problem */
88  template <class CharT, class OutItrT> 
89  const typename special_values_formatter<CharT, OutItrT>::char_type special_values_formatter<CharT, OutItrT>::default_special_value_names[3][17] = {
90    {'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'},
91    {'-','i','n','f','i','n','i','t','y'},
92    {'+','i','n','f','i','n','i','t','y'} };
93
94 } } //namespace boost::date_time
95
96#endif
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