text: //  Copyright (c) 2001-2010 Hartmut Kaiser
  //  Copyright (c) 2001-2010 Joel de Guzman
  // 
  //  Distributed under the Boost Software License, Version 1.0. (See accompanying 
  //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  
  #if !defined(SPIRIT_UPPER_LOWER_CASE_JANUARY_19_2009_1142AM)
  #define SPIRIT_UPPER_LOWER_CASE_JANUARY_19_2009_1142AM
  
  #if defined(_MSC_VER)
  #pragma once
  #endif
  
  #include <boost/spirit/home/support/common_terminals.hpp>
  #include <boost/spirit/home/support/modify.hpp>
  #include <boost/spirit/home/karma/domain.hpp>
  #include <boost/spirit/home/karma/meta_compiler.hpp>
  
  namespace boost { namespace spirit
  {
      ///////////////////////////////////////////////////////////////////////////
      // Enablers
      ///////////////////////////////////////////////////////////////////////////
      template <typename CharEncoding>
      struct use_directive<
          karma::domain, tag::char_code<tag::upper, CharEncoding> > // enables upper
        : mpl::true_ {};
  
      template <typename CharEncoding>
      struct use_directive<
          karma::domain, tag::char_code<tag::lower, CharEncoding> > // enables lower
        : mpl::true_ {};
  
      ///////////////////////////////////////////////////////////////////////////
      template <typename CharEncoding>
      struct is_modifier_directive<karma::domain
          , tag::char_code<tag::upper, CharEncoding> >
        : mpl::true_ {};
  
      template <typename CharEncoding>
      struct is_modifier_directive<karma::domain
          , tag::char_code<tag::lower, CharEncoding> >
        : mpl::true_ {};
  
      ///////////////////////////////////////////////////////////////////////////
      // Don't add tag::upper or tag::lower if there is already one of those in
      // the modifier list
      template <typename Current, typename CharEncoding>
      struct compound_modifier<
              Current
            , tag::char_code<tag::upper, CharEncoding>
            , typename enable_if<
                  has_modifier<Current, tag::char_code<tag::lower, CharEncoding> > 
              >::type
            >
        : Current
      {
          compound_modifier()
            : Current() {}
  
          compound_modifier(Current const& current, 
                  tag::char_code<tag::upper, CharEncoding> const&)
            : Current(current) {}
      };
  
      template <typename Current, typename CharEncoding>
      struct compound_modifier<
              Current
            , tag::char_code<tag::lower, CharEncoding>
            , typename enable_if<
                  has_modifier<Current, tag::char_code<tag::upper, CharEncoding> > 
              >::type
            >
        : Current
      {
          compound_modifier()
            : Current() {}
  
          compound_modifier(Current const& current, 
                  tag::char_code<tag::lower, CharEncoding> const&)
            : Current(current) {}
      };
  
  }}
  
  #endif
  