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



struct indirect_cmp {
  // types
  typedef std::size_t first_argument_type; 
  typedef std::size_t second_argument_type;
  typedef bool        result_type;         

  // 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;
};