1 // Boost next_prior.hpp header file ---------------------------------------//
3 // (C) Copyright Dave Abrahams and Daniel Walker 1999-2003. Distributed under the Boost
4 // Software License, Version 1.0. (See accompanying file
5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 // See http://www.boost.org/libs/utility for documentation.
10 // 13 Dec 2003 Added next(x, n) and prior(x, n) (Daniel Walker)
12 #ifndef BOOST_NEXT_PRIOR_HPP_INCLUDED
13 #define BOOST_NEXT_PRIOR_HPP_INCLUDED
19 // Helper functions for classes like bidirectional iterators not supporting
20 // operator+ and operator-
23 // const std::list<T>::iterator p = get_some_iterator();
24 // const std::list<T>::iterator prev = boost::prior(p);
25 // const std::list<T>::iterator next = boost::next(prev, 2);
27 // Contributed by Dave Abrahams
30 inline T
next(T x
) { return ++x
; }
32 template <class T
, class Distance
>
33 inline T
next(T x
, Distance n
)
40 inline T
prior(T x
) { return --x
; }
42 template <class T
, class Distance
>
43 inline T
prior(T x
, Distance n
)
51 #endif // BOOST_NEXT_PRIOR_HPP_INCLUDED