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.txt or http://www.boost.org/LICENSE_1_0.txt)
9 * Author: Jeff Garland
10 * $Date$
11 */
12
13#include <vector>
14#include <string>
15#include <iterator>
16#include "boost/date_time/special_defs.hpp"
17
18namespace boost { namespace date_time {
19
20
21 //! Class that provides generic formmatting ostream formatting for special values
22 /*! This class provides for the formmating of special values to an output stream.
23 * In particular, it produces strings for the values of negative and positive
24 * infinity as well as not_a_date_time.
25 *
26 * While not a facet, this class is used by the date and time facets for formatting
27 * special value types.
28 *
29 */
30 template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > >
31 class special_values_formatter
32 {
33 public:
34 typedef std::basic_string<CharT> string_type;
35 typedef CharT char_type;
36 typedef std::vector<string_type> collection_type;
37 static const char_type default_special_value_names[3][17];
38
39 //! Construct special values formatter using default strings.
40 /*! Default strings are not-a-date-time -infinity +infinity
41 */
42 special_values_formatter()
43 {
44 std::copy(&default_special_value_names[0],
45 &default_special_value_names[3],
46 std::back_inserter(m_special_value_names));
47 }
48
49 //! Construct special values formatter from array of strings
50 /*! This constructor will take pair of iterators from an array of strings
51 * that represent the special values and copy them for use in formatting
52 * special values.
53 *@code
54 * const char* const special_value_names[]={"nadt","-inf","+inf" };
55 *
56 * special_value_formatter svf(&special_value_names[0], &special_value_names[3]);
57 *@endcode
58 */
59 special_values_formatter(const char_type* const* begin, const char_type* const* end)
60 {
61 std::copy(begin, end, std::back_inserter(m_special_value_names));
62 }
63 special_values_formatter(typename collection_type::iterator beg, typename collection_type::iterator end)
64 {
65 std::copy(beg, end, std::back_inserter(m_special_value_names));
66 }
67
68 OutItrT put_special(OutItrT next,
69 const boost::date_time::special_values& value) const
70 {
71
72 unsigned int index = value;
73 if (index < m_special_value_names.size()) {
74 std::copy(m_special_value_names[index].begin(),
75 m_special_value_names[index].end(),
76 next);
77 }
78 return next;
79 }
80 protected:
81 collection_type m_special_value_names;
82 };
83
84 //! Storage for the strings used to indicate special values
85 /* using c_strings to initialize these worked fine in testing, however,
86 * a project that compiled its objects separately, then linked in a separate
87 * step wound up with redefinition errors for the values in this array.
88 * Initializing individual characters eliminated this problem */
89 template <class CharT, class OutItrT>
90 const typename special_values_formatter<CharT, OutItrT>::char_type special_values_formatter<CharT, OutItrT>::default_special_value_names[3][17] = {
91 {'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'},
92 {'-','i','n','f','i','n','i','t','y'},
93 {'+','i','n','f','i','n','i','t','y'} };
94
95 } } //namespace boost::date_time
96
97#endif
98

source code of boost/libs/date_time/include/boost/date_time/special_values_formatter.hpp