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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> | |
20effc67 | 15 | #include <iterator> |
7c673cae FG |
16 | #include "boost/date_time/special_defs.hpp" |
17 | ||
18 | namespace 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 |