[857] | 1 |
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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 or http://www.boost.org/LICENSE-1.0)
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| 9 | * Author: Jeff Garland
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| 10 | * $Date: 2005/05/03 14:27:51 $
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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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