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70 lines
2.2 KiB
70 lines
2.2 KiB
/* |
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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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