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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
- //
- // Distributed under the Boost Software License, Version 1.0
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- //
- // See http://boostorg.github.com/compute for more information.
- //---------------------------------------------------------------------------//
- #ifndef BOOST_COMPUTE_DETAIL_ITERATOR_PLUS_DISTANCE_HPP
- #define BOOST_COMPUTE_DETAIL_ITERATOR_PLUS_DISTANCE_HPP
- #include <iterator>
- namespace boost {
- namespace compute {
- namespace detail {
- template<class Iterator, class Distance, class Tag>
- inline Iterator iterator_plus_distance(Iterator i, Distance n, Tag)
- {
- while(n--){ i++; }
- return i;
- }
- template<class Iterator, class Distance>
- inline Iterator iterator_plus_distance(Iterator i,
- Distance n,
- std::random_access_iterator_tag)
- {
- typedef typename
- std::iterator_traits<Iterator>::difference_type difference_type;
- return i + static_cast<difference_type>(n);
- }
- // similar to std::advance() except returns the advanced iterator and
- // also works with iterators that don't define difference_type
- template<class Iterator, class Distance>
- inline Iterator iterator_plus_distance(Iterator i, Distance n)
- {
- typedef typename std::iterator_traits<Iterator>::iterator_category tag;
- return iterator_plus_distance(i, n, tag());
- }
- } // end detail namespace
- } // end compute namespace
- } // end boost namespace
- #endif // BOOST_COMPUTE_DETAIL_ITERATOR_PLUS_DISTANCE_HPP
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