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97 lines
3.6 KiB
C++
97 lines
3.6 KiB
C++
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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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* $Date$
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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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