// In header: <boost/log/expressions/formatters/wrap_formatter.hpp>
template<typename FunT, typename CharT> 
class wrapped_formatter_terminal {
public:
  // types
  typedef CharT                                 char_type;      // Character type. 
  typedef std::basic_string< char_type >        string_type;    // String type. 
  typedef basic_formatting_ostream< char_type > stream_type;    // Formatting stream type. 
  typedef FunT                                  function_type;  // Wrapped function type. 
  typedef string_type                           result_type;    // Formatter result type. 
  // construct/copy/destruct
  explicit wrapped_formatter_terminal(function_type const &);
  wrapped_formatter_terminal(wrapped_formatter_terminal const &);
  // public member functions
  function_type const & get_function() const;
  template<typename ContextT> result_type operator()(ContextT const &);
  template<typename ContextT> result_type operator()(ContextT const &) const;
};