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2 | #ifndef DATETIME_SPECIAL_VALUE_FORMATTER_HPP___ |
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3 | #define DATETIME_SPECIAL_VALUE_FORMATTER_HPP___ |
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4 | |
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5 | /* Copyright (c) 2004 CrystalClear Software, Inc. |
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6 | * Use, modification and distribution is subject to the |
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7 | * Boost Software License, Version 1.0. (See accompanying |
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8 | * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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9 | * Author: Jeff Garland |
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10 | * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ |
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11 | */ |
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12 | |
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13 | #include <vector> |
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14 | #include <string> |
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15 | #include "boost/date_time/special_defs.hpp" |
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16 | |
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17 | namespace boost { namespace date_time { |
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18 | |
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19 | |
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20 | //! Class that provides generic formmatting ostream formatting for special values |
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21 | /*! This class provides for the formmating of special values to an output stream. |
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22 | * In particular, it produces strings for the values of negative and positive |
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23 | * infinity as well as not_a_date_time. |
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24 | * |
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25 | * While not a facet, this class is used by the date and time facets for formatting |
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26 | * special value types. |
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27 | * |
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28 | */ |
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29 | template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > > |
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30 | class special_values_formatter |
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31 | { |
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32 | public: |
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33 | typedef std::basic_string<CharT> string_type; |
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34 | typedef CharT char_type; |
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35 | typedef std::vector<string_type> collection_type; |
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36 | static const char_type default_special_value_names[3][17]; |
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37 | |
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38 | //! Construct special values formatter using default strings. |
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39 | /*! Default strings are not-a-date-time -infinity +infinity |
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40 | */ |
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41 | special_values_formatter() |
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42 | { |
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43 | std::copy(&default_special_value_names[0], |
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44 | &default_special_value_names[3], |
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45 | std::back_inserter(m_special_value_names)); |
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46 | } |
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47 | |
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48 | //! Construct special values formatter from array of strings |
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49 | /*! This constructor will take pair of iterators from an array of strings |
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50 | * that represent the special values and copy them for use in formatting |
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51 | * special values. |
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52 | *@code |
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53 | * const char* const special_value_names[]={"nadt","-inf","+inf" }; |
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54 | * |
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55 | * special_value_formatter svf(&special_value_names[0], &special_value_names[3]); |
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56 | *@endcode |
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57 | */ |
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58 | special_values_formatter(const char_type* const* begin, const char_type* const* end) |
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59 | { |
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60 | std::copy(begin, end, std::back_inserter(m_special_value_names)); |
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61 | } |
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62 | special_values_formatter(typename collection_type::iterator beg, typename collection_type::iterator end) |
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63 | { |
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64 | std::copy(beg, end, std::back_inserter(m_special_value_names)); |
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65 | } |
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66 | |
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67 | OutItrT put_special(OutItrT next, |
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68 | const boost::date_time::special_values& value) const |
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69 | { |
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70 | |
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71 | unsigned int index = value; |
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72 | if (index < m_special_value_names.size()) { |
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73 | std::copy(m_special_value_names[index].begin(), |
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74 | m_special_value_names[index].end(), |
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75 | next); |
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76 | } |
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77 | return next; |
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78 | } |
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79 | protected: |
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80 | collection_type m_special_value_names; |
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81 | }; |
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82 | |
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83 | //! Storage for the strings used to indicate special values |
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84 | /* using c_strings to initialize these worked fine in testing, however, |
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85 | * a project that compiled its objects separately, then linked in a separate |
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86 | * step wound up with redefinition errors for the values in this array. |
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87 | * Initializing individual characters eliminated this problem */ |
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88 | template <class CharT, class OutItrT> |
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89 | const typename special_values_formatter<CharT, OutItrT>::char_type special_values_formatter<CharT, OutItrT>::default_special_value_names[3][17] = { |
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90 | {'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'}, |
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91 | {'-','i','n','f','i','n','i','t','y'}, |
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92 | {'+','i','n','f','i','n','i','t','y'} }; |
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93 | |
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94 | } } //namespace boost::date_time |
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95 | |
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96 | #endif |
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