//---------------------------------------------------------------------------//
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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_IS_PERMUTATION_HPP
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#define BOOST_COMPUTE_ALGORITHM_IS_PERMUTATION_HPP
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#include <iterator>
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#include <boost/static_assert.hpp>
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#include <boost/compute/system.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/container/vector.hpp>
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#include <boost/compute/detail/iterator_range_size.hpp>
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#include <boost/compute/algorithm/equal.hpp>
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#include <boost/compute/algorithm/sort.hpp>
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#include <boost/compute/type_traits/is_device_iterator.hpp>
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namespace boost {
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namespace compute {
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///
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/// \brief Permutation checking algorithm
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///
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/// Checks if the range [first1, last1) can be permuted into the
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/// range [first2, last2)
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/// \return True, if it can be permuted. False, otherwise.
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///
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/// \param first1 Iterator pointing to start of first range
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/// \param last1 Iterator pointing to end of first range
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/// \param first2 Iterator pointing to start of second range
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/// \param last2 Iterator pointing to end of second range
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/// \param queue Queue on which to execute
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///
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/// Space complexity: \Omega(distance(\p first1, \p last1) + distance(\p first2, \p last2))
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template<class InputIterator1, class InputIterator2>
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inline bool is_permutation(InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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InputIterator2 last2,
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command_queue &queue = system::default_queue())
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{
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BOOST_STATIC_ASSERT(is_device_iterator<InputIterator1>::value);
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BOOST_STATIC_ASSERT(is_device_iterator<InputIterator2>::value);
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typedef typename std::iterator_traits<InputIterator1>::value_type value_type1;
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typedef typename std::iterator_traits<InputIterator2>::value_type value_type2;
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size_t count1 = detail::iterator_range_size(first1, last1);
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size_t count2 = detail::iterator_range_size(first2, last2);
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if(count1 != count2) return false;
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vector<value_type1> temp1(first1, last1, queue);
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vector<value_type2> temp2(first2, last2, queue);
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sort(temp1.begin(), temp1.end(), queue);
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sort(temp2.begin(), temp2.end(), queue);
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return equal(temp1.begin(), temp1.end(),
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temp2.begin(), 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_IS_PERMUTATION_HPP
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