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

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;       
};