Chris@16: 
Chris@16: #ifndef DATETIME_SPECIAL_VALUE_FORMATTER_HPP___
Chris@16: #define DATETIME_SPECIAL_VALUE_FORMATTER_HPP___
Chris@16: 
Chris@16: /* Copyright (c) 2004 CrystalClear Software, Inc.
Chris@16:  * Use, modification and distribution is subject to the 
Chris@16:  * Boost Software License, Version 1.0. (See accompanying
Chris@16:  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  * Author: Jeff Garland
Chris@101:  * $Date$
Chris@16:  */
Chris@16: 
Chris@16: #include <vector>
Chris@16: #include <string>
Chris@16: #include "boost/date_time/special_defs.hpp"
Chris@16: 
Chris@16: namespace boost { namespace date_time {
Chris@16: 
Chris@16: 
Chris@16:   //! Class that provides generic formmatting ostream formatting for special values
Chris@16:   /*! This class provides for the formmating of special values to an output stream.
Chris@16:    *  In particular, it produces strings for the values of negative and positive
Chris@16:    *  infinity as well as not_a_date_time.  
Chris@16:    *
Chris@16:    *  While not a facet, this class is used by the date and time facets for formatting
Chris@16:    *  special value types.
Chris@16:    *
Chris@16:    */
Chris@16:   template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > >
Chris@16:   class special_values_formatter  
Chris@16:   {
Chris@16:   public:
Chris@16:     typedef std::basic_string<CharT> string_type;
Chris@16:     typedef CharT                    char_type;
Chris@16:     typedef std::vector<string_type> collection_type;
Chris@16:     static const char_type default_special_value_names[3][17];
Chris@16: 
Chris@16:     //! Construct special values formatter using default strings.
Chris@16:     /*! Default strings are not-a-date-time -infinity +infinity
Chris@16:      */
Chris@16:     special_values_formatter() 
Chris@16:     {
Chris@16:       std::copy(&default_special_value_names[0], 
Chris@16:                 &default_special_value_names[3], 
Chris@16:                 std::back_inserter(m_special_value_names));      
Chris@16:     }
Chris@16: 
Chris@16:     //! Construct special values formatter from array of strings
Chris@16:     /*! This constructor will take pair of iterators from an array of strings
Chris@16:      *  that represent the special values and copy them for use in formatting
Chris@16:      *  special values.  
Chris@16:      *@code
Chris@16:      *  const char* const special_value_names[]={"nadt","-inf","+inf" };
Chris@16:      *
Chris@16:      *  special_value_formatter svf(&special_value_names[0], &special_value_names[3]);
Chris@16:      *@endcode
Chris@16:      */
Chris@16:     special_values_formatter(const char_type* const* begin, const char_type* const* end) 
Chris@16:     {
Chris@16:       std::copy(begin, end, std::back_inserter(m_special_value_names));
Chris@16:     }
Chris@16:     special_values_formatter(typename collection_type::iterator beg, typename collection_type::iterator end)
Chris@16:     {
Chris@16:       std::copy(beg, end, std::back_inserter(m_special_value_names));
Chris@16:     }
Chris@16: 
Chris@16:     OutItrT put_special(OutItrT next, 
Chris@16:                         const boost::date_time::special_values& value) const 
Chris@16:     {
Chris@16:       
Chris@16:       unsigned int index = value;
Chris@16:       if (index < m_special_value_names.size()) {
Chris@16:         std::copy(m_special_value_names[index].begin(), 
Chris@16:                   m_special_value_names[index].end(),
Chris@16:                   next);
Chris@16:       }
Chris@16:       return next;
Chris@16:     }
Chris@16:   protected:
Chris@16:     collection_type m_special_value_names;
Chris@16:   };
Chris@16: 
Chris@16:   //! Storage for the strings used to indicate special values 
Chris@16:   /* using c_strings to initialize these worked fine in testing, however,
Chris@16:    * a project that compiled its objects separately, then linked in a separate
Chris@16:    * step wound up with redefinition errors for the values in this array.
Chris@16:    * Initializing individual characters eliminated this problem */
Chris@16:   template <class CharT, class OutItrT>  
Chris@16:   const typename special_values_formatter<CharT, OutItrT>::char_type special_values_formatter<CharT, OutItrT>::default_special_value_names[3][17] = { 
Chris@16:     {'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'},
Chris@16:     {'-','i','n','f','i','n','i','t','y'},
Chris@16:     {'+','i','n','f','i','n','i','t','y'} };
Chris@16: 
Chris@16:  } } //namespace boost::date_time
Chris@16: 
Chris@16: #endif