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