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