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96 lines
3.6 KiB
96 lines
3.6 KiB
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#ifndef DATETIME_SPECIAL_VALUE_FORMATTER_HPP___ |
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#define DATETIME_SPECIAL_VALUE_FORMATTER_HPP___ |
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/* Copyright (c) 2004 CrystalClear Software, Inc. |
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* Use, modification and distribution is subject to the |
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* Boost Software License, Version 1.0. (See accompanying |
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* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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* Author: Jeff Garland |
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* $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $ |
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*/ |
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#include <vector> |
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#include <string> |
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#include "boost/date_time/special_defs.hpp" |
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namespace boost { namespace date_time { |
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//! Class that provides generic formmatting ostream formatting for special values |
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/*! This class provides for the formmating of special values to an output stream. |
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* In particular, it produces strings for the values of negative and positive |
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* infinity as well as not_a_date_time. |
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* |
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* While not a facet, this class is used by the date and time facets for formatting |
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* special value types. |
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* |
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*/ |
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template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > > |
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class special_values_formatter |
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{ |
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public: |
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typedef std::basic_string<CharT> string_type; |
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typedef CharT char_type; |
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typedef std::vector<string_type> collection_type; |
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static const char_type default_special_value_names[3][17]; |
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//! Construct special values formatter using default strings. |
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/*! Default strings are not-a-date-time -infinity +infinity |
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*/ |
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special_values_formatter() |
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{ |
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std::copy(&default_special_value_names[0], |
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&default_special_value_names[3], |
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std::back_inserter(m_special_value_names)); |
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} |
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//! Construct special values formatter from array of strings |
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/*! This constructor will take pair of iterators from an array of strings |
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* that represent the special values and copy them for use in formatting |
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* special values. |
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*@code |
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* const char* const special_value_names[]={"nadt","-inf","+inf" }; |
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* |
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* special_value_formatter svf(&special_value_names[0], &special_value_names[3]); |
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*@endcode |
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*/ |
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special_values_formatter(const char_type* const* begin, const char_type* const* end) |
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{ |
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std::copy(begin, end, std::back_inserter(m_special_value_names)); |
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} |
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special_values_formatter(typename collection_type::iterator beg, typename collection_type::iterator end) |
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{ |
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std::copy(beg, end, std::back_inserter(m_special_value_names)); |
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} |
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OutItrT put_special(OutItrT next, |
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const boost::date_time::special_values& value) const |
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{ |
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unsigned int index = value; |
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if (index < m_special_value_names.size()) { |
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std::copy(m_special_value_names[index].begin(), |
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m_special_value_names[index].end(), |
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next); |
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} |
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return next; |
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} |
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protected: |
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collection_type m_special_value_names; |
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}; |
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//! Storage for the strings used to indicate special values |
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/* using c_strings to initialize these worked fine in testing, however, |
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* a project that compiled its objects separately, then linked in a separate |
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* step wound up with redefinition errors for the values in this array. |
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* Initializing individual characters eliminated this problem */ |
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template <class CharT, class OutItrT> |
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const typename special_values_formatter<CharT, OutItrT>::char_type special_values_formatter<CharT, OutItrT>::default_special_value_names[3][17] = { |
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{'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'}, |
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{'-','i','n','f','i','n','i','t','y'}, |
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{'+','i','n','f','i','n','i','t','y'} }; |
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} } //namespace boost::date_time |
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#endif
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