Regex e;
      e = m_string;
      e.assign(m_string);
      e.assign(m_string, m_flags);

      // sub_match:
      string_type s(m_sub);
      ignore_unused_variable_warning(s);
      s = m_sub.str();
      ignore_unused_variable_warning(s);
      int i = m_sub.compare(m_string);
      ignore_unused_variable_warning(i);

      int i2 = m_sub.compare(m_sub);
      ignore_unused_variable_warning(i2);
      i2 = m_sub.compare(m_pointer);
      ignore_unused_variable_warning(i2);

      bool b = m_sub == m_sub;
      ignore_unused_variable_warning(b);
      b = m_sub != m_sub;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_sub > m_sub;
      ignore_unused_variable_warning(b);
      b = m_sub >= m_sub;
      ignore_unused_variable_warning(b);

      b = m_sub == m_pointer;
      ignore_unused_variable_warning(b);
      b = m_sub != m_pointer;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_pointer;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_pointer;
      ignore_unused_variable_warning(b);
      b = m_sub > m_pointer;
      ignore_unused_variable_warning(b);
      b = m_sub >= m_pointer;
      ignore_unused_variable_warning(b);

      b = m_pointer == m_sub;
      ignore_unused_variable_warning(b);
      b = m_pointer != m_sub;
      ignore_unused_variable_warning(b);
      b = m_pointer <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_pointer <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_pointer > m_sub;
      ignore_unused_variable_warning(b);
      b = m_pointer >= m_sub;
      ignore_unused_variable_warning(b);

      b = m_sub == m_char;
      ignore_unused_variable_warning(b);
      b = m_sub != m_char;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_char;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_char;
      ignore_unused_variable_warning(b);
      b = m_sub > m_char;
      ignore_unused_variable_warning(b);
      b = m_sub >= m_char;
      ignore_unused_variable_warning(b);

      b = m_char == m_sub;
      ignore_unused_variable_warning(b);
      b = m_char != m_sub;
      ignore_unused_variable_warning(b);
      b = m_char <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_char <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_char > m_sub;
      ignore_unused_variable_warning(b);
      b = m_char >= m_sub;
      ignore_unused_variable_warning(b);

      b = m_sub == m_string;
      ignore_unused_variable_warning(b);
      b = m_sub != m_string;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_string;
      ignore_unused_variable_warning(b);
      b = m_sub <= m_string;
      ignore_unused_variable_warning(b);
      b = m_sub > m_string;
      ignore_unused_variable_warning(b);
      b = m_sub >= m_string;
      ignore_unused_variable_warning(b);

      b = m_string == m_sub;
      ignore_unused_variable_warning(b);
      b = m_string != m_sub;
      ignore_unused_variable_warning(b);
      b = m_string <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_string <= m_sub;
      ignore_unused_variable_warning(b);
      b = m_string > m_sub;
      ignore_unused_variable_warning(b);
      b = m_string >= m_sub;
      ignore_unused_variable_warning(b);

      // match results:
      m_string = m_results.str();
      ignore_unused_variable_warning(m_string);
      m_string = m_results.str(0);
      ignore_unused_variable_warning(m_string);
      m_out = m_cresults.format(m_out, m_string);
      m_out = m_cresults.format(m_out, m_string, m_mft);
      m_string = m_cresults.format(m_string);
      ignore_unused_variable_warning(m_string);
      m_string = m_cresults.format(m_string, m_mft);
      ignore_unused_variable_warning(m_string);

      // regex_match:
      b = global_regex_namespace::regex_match(m_string, m_smatch, e);
      ignore_unused_variable_warning(b);
      b = global_regex_namespace::regex_match(m_string, m_smatch, e, m_mft);
      ignore_unused_variable_warning(b);
      b = global_regex_namespace::regex_match(m_string, e);
      ignore_unused_variable_warning(b);
      b = global_regex_namespace::regex_match(m_string, e, m_mft);
      ignore_unused_variable_warning(b);

      // regex_search:
      b = global_regex_namespace::regex_search(m_string, m_smatch, e);
      ignore_unused_variable_warning(b);
      b = global_regex_namespace::regex_search(m_string, m_smatch, e, m_mft);
      ignore_unused_variable_warning(b);
      b = global_regex_namespace::regex_search(m_string, e);
      ignore_unused_variable_warning(b);
      b = global_regex_namespace::regex_search(m_string, e, m_mft);
      ignore_unused_variable_warning(b);

      // regex_replace:
      m_out = global_regex_namespace::regex_replace(m_out, m_in, m_in, e, m_string, m_mft);
      m_out = global_regex_namespace::regex_replace(m_out, m_in, m_in, e, m_string);
      m_string = global_regex_namespace::regex_replace(m_string, e, m_string, m_mft);
      ignore_unused_variable_warning(m_string);
      m_string = global_regex_namespace::regex_replace(m_string, e, m_string);
      ignore_unused_variable_warning(m_string);

   }

   flag_type m_flags;
   string_type m_string;
   const sub_match_type m_sub;
   match_results_type m_results;
   pointer_type m_pointer;
   value_type m_char;
   const match_results_type m_cresults;
   OutIterator m_out;
   BidiIterator m_in;
   global_regex_namespace::regex_constants::match_flag_type m_mft;
   global_regex_namespace::match_results<typename string_type::const_iterator> m_smatch;

   RegexConcept();
   RegexConcept(const RegexConcept&);
   RegexConcept& operator=(const RegexConcept&);
};

#ifndef BOOST_REGEX_TEST_STD
//
// BoostRegexConcept:
// Test every interface in the Boost implementation:
//
template <class Regex>
struct BoostRegexConcept
{
   typedef typename Regex::value_type value_type;
   typedef typename Regex::size_type size_type;
   typedef typename Regex::flag_type flag_type;
   typedef typename Regex::locale_type locale_type;

   // derived test types:
   typedef const value_type* pointer_type;
   typedef std::basic_string<value_type> string_type;
   typedef typename Regex::const_iterator const_iterator;
   typedef bidirectional_iterator_archetype<value_type> BidiIterator;
   typedef global_regex_namespace::sub_match<BidiIterator> sub_match_type;
   typedef global_regex_namespace::match_results<BidiIterator> match_results_type;

   void constraints() 
   {
      global_regex_namespace::regex_constants::match_flag_type mopts
         = global_regex_namespace::regex_constants::match_default
         | global_regex_namespace::regex_constants::match_not_bol
         | global_regex_namespace::regex_constants::match_not_eol
         | global_regex_namespace::regex_constants::match_not_bow
         | global_regex_namespace::regex_constants::match_not_eow
         | global_regex_namespace::regex_constants::match_any
         | global_regex_namespace::regex_constants::match_not_null
         | global_regex_namespace::regex_constants::match_continuous
         | global_regex_namespace::regex_constants::match_partial
         | global_regex_namespace::regex_constants::match_prev_avail
         | global_regex_namespace::regex_constants::format_default
         | global_regex_namespace::regex_constants::format_sed
         | global_regex_namespace::regex_constants::format_perl
         | global_regex_namespace::regex_constants::format_no_copy
         | global_regex_namespace::regex_constants::format_first_only;

      (void)mopts;

      function_requires<RegexConcept<Regex> >();
      const global_regex_namespace::regex_error except(global_regex_namespace::regex_constants::error_collate);
      std::ptrdiff_t pt = except.position();
      ignore_unused_variable_warning(pt);
      const Regex ce, ce2;
#ifndef BOOST_NO_STD_LOCALE
      m_stream << ce;
#endif
      unsigned i = ce.error_code();
      ignore_unused_variable_warning(i);
      pointer_type p = ce.expression();
      ignore_unused_variable_warning(p);
      int i2 = ce.compare(ce2);
      ignore_unused_variable_warning(i2);
      bool b = ce == ce2;
      ignore_unused_variable_warning(b);
      b = ce != ce2;
      ignore_unused_variable_warning(b);
      b = ce < ce2;
      ignore_unused_variable_warning(b);
      b = ce > ce2;
      ignore_unused_variable_warning(b);
      b = ce <= ce2;
      ignore_unused_variable_warning(b);
      b = ce >= ce2;
      ignore_unused_variable_warning(b);
      i = ce.status();
      ignore_unused_variable_warning(i);
      size_type s = ce.max_size();
      ignore_unused_variable_warning(s);
      s = ce.size();
      ignore_unused_variable_warning(s);
      const_iterator pi = ce.begin();
      ignore_unused_variable_warning(pi);
      pi = ce.end();
      ignore_unused_variable_warning(pi);
      string_type s2 = ce.str();
      ignore_unused_variable_warning(s2);

      m_string = m_sub + m_sub;
      ignore_unused_variable_warning(m_string);
      m_string = m_sub + m_pointer;
      ignore_unused_variable_warning(m_string);
      m_string = m_pointer + m_sub;
      ignore_unused_variable_warning(m_string);
      m_string = m_sub + m_string;
      ignore_unused_variable_warning(m_string);
      m_string = m_string + m_sub;
      ignore_unused_variable_warning(m_string);
      m_string = m_sub + m_char;
      ignore_unused_variable_warning(m_string);
      m_string = m_char + m_sub;
      ignore_unused_variable_warning(m_string);

#ifndef BOOST_NO_STD_LOCALE
      m_stream << m_sub;
      m_stream << m_cresults;
#endif
   }

   std::basic_ostream<value_type> m_stream;
   sub_match_type m_sub;
   pointer_type m_pointer;
   string_type m_string;
   const value_type m_char;
   match_results_type m_results;
   const match_results_type m_cresults;

   BoostRegexConcept();
   BoostRegexConcept(const BoostRegexConcept&);
   BoostRegexConcept& operator=(const BoostRegexConcept&);
};

#endif // BOOST_REGEX_TEST_STD

}

#endif