55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
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//---------------------------------------------------------------------------//
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// Copyright (c) 2014 Roshan <thisisroshansmail@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_ALGORITHM_ROTATE_HPP
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#define BOOST_COMPUTE_ALGORITHM_ROTATE_HPP
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#include <boost/compute/system.hpp>
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#include <boost/compute/algorithm/copy.hpp>
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#include <boost/compute/container/vector.hpp>
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namespace boost {
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namespace compute {
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/// Performs left rotation such that element at \p n_first comes to the
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/// beginning.
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///
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/// \see rotate_copy()
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template<class InputIterator>
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inline void rotate(InputIterator first,
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InputIterator n_first,
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InputIterator last,
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command_queue &queue = system::default_queue())
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{
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//Handle trivial cases
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if (n_first==first || n_first==last)
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{
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return;
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}
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//Handle others
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typedef typename std::iterator_traits<InputIterator>::value_type T;
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size_t count = detail::iterator_range_size(first, n_first);
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size_t count2 = detail::iterator_range_size(first, last);
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const context &context = queue.get_context();
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vector<T> temp(count2, context);
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::boost::compute::copy(first, last, temp.begin(), queue);
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::boost::compute::copy(temp.begin()+count, temp.end(), first, queue);
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::boost::compute::copy(temp.begin(), temp.begin()+count, last-count, queue);
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}
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} //end compute namespace
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} //end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_ROTATE_HPP
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