//---------------------------------------------------------------------------//
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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_ALGORITHM_MISMATCH_HPP
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#define BOOST_COMPUTE_ALGORITHM_MISMATCH_HPP
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#include <iterator>
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#include <utility>
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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/functional.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/algorithm/find.hpp>
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#include <boost/compute/iterator/transform_iterator.hpp>
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#include <boost/compute/iterator/zip_iterator.hpp>
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#include <boost/compute/functional/detail/unpack.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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/// Returns a pair of iterators pointing to the first position where the
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/// range [\p first1, \p last1) and the range starting at \p first2
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/// differ.
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///
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/// Space complexity: \Omega(1)
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template<class InputIterator1, class InputIterator2>
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inline std::pair<InputIterator1, InputIterator2>
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mismatch(InputIterator1 first1,
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InputIterator1 last1,
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InputIterator2 first2,
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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_type;
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::boost::compute::equal_to<value_type> op;
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InputIterator2 last2 = first2 + std::distance(first1, last1);
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InputIterator1 iter =
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boost::get<0>(
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::boost::compute::find(
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::boost::compute::make_transform_iterator(
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::boost::compute::make_zip_iterator(
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boost::make_tuple(first1, first2)
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),
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detail::unpack(op)
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),
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::boost::compute::make_transform_iterator(
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::boost::compute::make_zip_iterator(
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boost::make_tuple(last1, last2)
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),
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detail::unpack(op)
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),
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false,
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queue
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).base().get_iterator_tuple()
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);
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return std::make_pair(iter, first2 + std::distance(first1, iter));
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}
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/// \overload
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template<class InputIterator1, class InputIterator2>
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inline std::pair<InputIterator1, InputIterator2>
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mismatch(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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if(std::distance(first1, last1) < std::distance(first2, last2)){
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return ::boost::compute::mismatch(first1, last1, first2, queue);
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}
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else {
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return ::boost::compute::mismatch(
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first1, first1 + std::distance(first2, last2), first2, queue
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);
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}
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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_MISMATCH_HPP
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