// In header: <boost/xpressive/regex_actions.hpp>

struct make_pair {
  // member classes/structs/unions
  template<typename Sig> 
  struct result {
  };
  template<typename This, typename First, typename Second> 
  struct result<This(First, Second)> {
    // types
    typedef decay< First >::type                 first_type;   // For exposition only. 
    typedef decay< Second >::type                second_type;  // For exposition only. 
    typedef std::pair< first_type, second_type > type;       
  };
  // public member functions
  template<typename First, typename Second> 
    std::pair< First, Second > operator()(First const &, Second const &) const;
};