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1 | //---------------------------------------------------------------------------// |
2 | // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com> | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0 | |
5 | // See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt | |
7 | // | |
8 | // See http://boostorg.github.com/compute for more information. | |
9 | //---------------------------------------------------------------------------// | |
10 | ||
11 | #ifndef BOOST_COMPUTE_DETAIL_ITERATOR_PLUS_DISTANCE_HPP | |
12 | #define BOOST_COMPUTE_DETAIL_ITERATOR_PLUS_DISTANCE_HPP | |
13 | ||
14 | #include <iterator> | |
15 | ||
16 | namespace boost { | |
17 | namespace compute { | |
18 | namespace detail { | |
19 | ||
20 | template<class Iterator, class Distance, class Tag> | |
21 | inline Iterator iterator_plus_distance(Iterator i, Distance n, Tag) | |
22 | { | |
23 | while(n--){ i++; } | |
24 | ||
25 | return i; | |
26 | } | |
27 | ||
28 | template<class Iterator, class Distance> | |
29 | inline Iterator iterator_plus_distance(Iterator i, | |
30 | Distance n, | |
31 | std::random_access_iterator_tag) | |
32 | { | |
33 | typedef typename | |
34 | std::iterator_traits<Iterator>::difference_type difference_type; | |
35 | ||
36 | return i + static_cast<difference_type>(n); | |
37 | } | |
38 | ||
39 | // similar to std::advance() except returns the advanced iterator and | |
40 | // also works with iterators that don't define difference_type | |
41 | template<class Iterator, class Distance> | |
42 | inline Iterator iterator_plus_distance(Iterator i, Distance n) | |
43 | { | |
44 | typedef typename std::iterator_traits<Iterator>::iterator_category tag; | |
45 | ||
46 | return iterator_plus_distance(i, n, tag()); | |
47 | } | |
48 | ||
49 | } // end detail namespace | |
50 | } // end compute namespace | |
51 | } // end boost namespace | |
52 | ||
53 | #endif // BOOST_COMPUTE_DETAIL_ITERATOR_PLUS_DISTANCE_HPP |