#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 |