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71 lines
2.2 KiB
71 lines
2.2 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/reverse.h>
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#include <thrust/advance.h>
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#include <thrust/distance.h>
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#include <thrust/detail/copy.h>
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#include <thrust/swap.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/iterator/reverse_iterator.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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template<typename ExecutionPolicy, typename BidirectionalIterator>
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void reverse(thrust::execution_policy<ExecutionPolicy> &exec,
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BidirectionalIterator first,
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BidirectionalIterator last)
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{
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typedef typename thrust::iterator_difference<BidirectionalIterator>::type difference_type;
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// find the midpoint of [first,last)
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difference_type N = thrust::distance(first, last);
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BidirectionalIterator mid(first);
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thrust::advance(mid, N / 2);
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// swap elements of [first,mid) with [last - 1, mid)
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thrust::swap_ranges(exec, first, mid, thrust::make_reverse_iterator(last));
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} // end reverse()
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template<typename ExecutionPolicy,
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typename BidirectionalIterator,
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typename OutputIterator>
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OutputIterator reverse_copy(thrust::execution_policy<ExecutionPolicy> &exec,
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BidirectionalIterator first,
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BidirectionalIterator last,
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OutputIterator result)
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{
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return thrust::copy(exec,
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thrust::make_reverse_iterator(last),
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thrust::make_reverse_iterator(first),
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result);
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} // end reverse_copy()
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} // end namespace generic
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} // end namespace detail
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} // end namespace system
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} // end namespace thrust
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