source:
vendors/XIOS/current/extern/boost/include/boost/next_prior.hpp
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1 | // Boost next_prior.hpp header file ---------------------------------------// |
2 | |
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) |
6 | |
7 | // See http://www.boost.org/libs/utility for documentation. |
8 | |
9 | // Revision History |
10 | // 13 Dec 2003 Added next(x, n) and prior(x, n) (Daniel Walker) |
11 | |
12 | #ifndef BOOST_NEXT_PRIOR_HPP_INCLUDED |
13 | #define BOOST_NEXT_PRIOR_HPP_INCLUDED |
14 | |
15 | #include <iterator> |
16 | |
17 | namespace boost { |
18 | |
19 | // Helper functions for classes like bidirectional iterators not supporting |
20 | // operator+ and operator- |
21 | // |
22 | // Usage: |
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); |
26 | |
27 | // Contributed by Dave Abrahams |
28 | |
29 | template <class T> |
30 | inline T next(T x) { return ++x; } |
31 | |
32 | template <class T, class Distance> |
33 | inline T next(T x, Distance n) |
34 | { |
35 | std::advance(x, n); |
36 | return x; |
37 | } |
38 | |
39 | template <class T> |
40 | inline T prior(T x) { return --x; } |
41 | |
42 | template <class T, class Distance> |
43 | inline T prior(T x, Distance n) |
44 | { |
45 | std::advance(x, -n); |
46 | return x; |
47 | } |
48 | |
49 | } // namespace boost |
50 | |
51 | #endif // BOOST_NEXT_PRIOR_HPP_INCLUDED |
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