text: //  Boost next_prior.hpp header file  ---------------------------------------//
  
  //  (C) Copyright Boost.org 1999-2003. Permission to copy, use, modify, sell
  //  and distribute this software is granted provided this copyright
  //  notice appears in all copies. This software is provided "as is" without
  //  express or implied warranty, and with no claim as to its suitability for
  //  any purpose.
  
  //  See http://www.boost.org/libs/utility for documentation.
  
  #ifndef BOOST_NEXT_PRIOR_HPP_INCLUDED
  #define BOOST_NEXT_PRIOR_HPP_INCLUDED
  
  namespace boost {
  
  //  Helper functions for classes like bidirectional iterators not supporting
  //  operator+ and operator-
  //
  //  Usage:
  //    const std::list<T>::iterator p = get_some_iterator();
  //    const std::list<T>::iterator prev = boost::prior(p);
  
  //  Contributed by Dave Abrahams
  
  template <class T>
  inline T next(T x) { return ++x; }
  
  template <class T>
  inline T prior(T x) { return --x; }
  
  } // namespace boost
  
  #endif  // BOOST_NEXT_PRIOR_HPP_INCLUDED
  