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74 lines
2.3 KiB
74 lines
2.3 KiB
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <thrust/detail/config.h>
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#include <thrust/system/detail/generic/swap_ranges.h>
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#include <thrust/tuple.h>
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#include <thrust/iterator/zip_iterator.h>
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#include <thrust/detail/internal_functional.h>
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#include <thrust/for_each.h>
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namespace thrust
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{
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namespace system
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{
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namespace detail
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{
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namespace generic
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{
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namespace detail
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{
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// XXX define this here rather than in internal_functional.h
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// to avoid circular dependence between swap.h & internal_functional.h
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struct swap_pair_elements
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{
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template <typename Tuple>
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__host__ __device__
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void operator()(Tuple t)
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{
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// use unqualified swap to allow ADL to catch any user-defined swap
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using thrust::swap;
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swap(thrust::get<0>(t), thrust::get<1>(t));
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}
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}; // end swap_pair_elements
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} // end detail
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template<typename DerivedPolicy,
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typename ForwardIterator1,
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typename ForwardIterator2>
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ForwardIterator2 swap_ranges(thrust::execution_policy<DerivedPolicy> &exec,
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ForwardIterator1 first1,
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ForwardIterator1 last1,
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ForwardIterator2 first2)
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{
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typedef thrust::tuple<ForwardIterator1,ForwardIterator2> IteratorTuple;
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typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
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ZipIterator result = thrust::for_each(exec,
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thrust::make_zip_iterator(thrust::make_tuple(first1, first2)),
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thrust::make_zip_iterator(thrust::make_tuple(last1, first2)),
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detail::swap_pair_elements());
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return thrust::get<1>(result.get_iterator_tuple());
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} // end swap_ranges()
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} // end generic
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} // end detail
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} // end system
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} // end thrust
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