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-rw-r--r--boost/compute/algorithm/rotate.hpp54
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+//---------------------------------------------------------------------------//
+// Copyright (c) 2014 Roshan <thisisroshansmail@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_ALGORITHM_ROTATE_HPP
+#define BOOST_COMPUTE_ALGORITHM_ROTATE_HPP
+
+#include <boost/compute/system.hpp>
+#include <boost/compute/algorithm/copy.hpp>
+#include <boost/compute/container/vector.hpp>
+
+namespace boost {
+namespace compute {
+
+/// Performs left rotation such that element at \p n_first comes to the
+/// beginning.
+///
+/// \see rotate_copy()
+template<class InputIterator>
+inline void rotate(InputIterator first,
+ InputIterator n_first,
+ InputIterator last,
+ command_queue &queue = system::default_queue())
+{
+ //Handle trivial cases
+ if (n_first==first || n_first==last)
+ {
+ return;
+ }
+
+ //Handle others
+ typedef typename std::iterator_traits<InputIterator>::value_type T;
+
+ size_t count = detail::iterator_range_size(first, n_first);
+ size_t count2 = detail::iterator_range_size(first, last);
+
+ const context &context = queue.get_context();
+ vector<T> temp(count2, context);
+ ::boost::compute::copy(first, last, temp.begin(), queue);
+
+ ::boost::compute::copy(temp.begin()+count, temp.end(), first, queue);
+ ::boost::compute::copy(temp.begin(), temp.begin()+count, last-count, queue);
+}
+
+} //end compute namespace
+} //end boost namespace
+
+#endif // BOOST_COMPUTE_ALGORITHM_ROTATE_HPP