// In header: <boost/accumulators/statistics/tail.hpp>

template<typename Sample, typename LeftRight> 
struct tail_impl {
  // types
  typedef mpl::if_< is_same< LeftRight, right >, numeric::functional::greater< Sample const, Sample const  >, numeric::functional::less< Sample const, Sample const  > >::type predicate_type;
  typedef unspecified                                                                                                                                                          result_type;   

  // member classes/structs/unions

  struct indirect_cmp {
    // construct/copy/destruct
    indirect_cmp(std::vector< Sample > const &);
    indirect_cmp& operator=(indirect_cmp const &);

    // public member functions
    bool operator()(std::size_t, std::size_t) const;
  };

  struct is_tail_variate {
    // member classes/structs/unions
    template<typename T> 
    struct apply {
    };
  };

  // construct/copy/destruct
  template<typename Args> tail_impl(Args const &);
  tail_impl(tail_impl const &);

  // public member functions
   BOOST_MPL_ASSERT((mpl::or_< is_same< LeftRight, right >, is_same< LeftRight, left > >));
  template<typename Args> void operator()(Args const &);
  result_type result(dont_care) const;

  // private member functions
  template<typename Args> void assign(Args const &, std::size_t);
};