// In header: <boost/proto/functional/std/utility.hpp>

struct make_pair :  proto::callable {
  // member classes/structs/unions
  template<typename This, typename First, typename Second> 
  struct result<This(First, Second)> {
    // types
    typedef std::pair<
        typename boost::remove_const<typename boost::remove_reference<First>::type>::type
      , typename boost::remove_const<typename boost::remove_reference<Second>::type>::type
    > type;
  };
  // public member functions
  template<typename First, typename Second> 
    typename std::pair< First, Second > 
    operator()(First const &, Second const &) const;
};