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76 lines
2.6 KiB
76 lines
2.6 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/adjacent_difference.h> |
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#include <thrust/adjacent_difference.h> |
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#include <thrust/functional.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/detail/temporary_array.h> |
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#include <thrust/transform.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 DerivedPolicy, class InputIterator, class OutputIterator> |
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OutputIterator adjacent_difference(thrust::execution_policy<DerivedPolicy> &exec, |
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InputIterator first, InputIterator last, |
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OutputIterator result) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator>::value_type InputType; |
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thrust::minus<InputType> binary_op; |
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return thrust::adjacent_difference(exec, first, last, result, binary_op); |
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} // end adjacent_difference() |
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template <typename DerivedPolicy, class InputIterator, class OutputIterator, class BinaryFunction> |
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OutputIterator adjacent_difference(thrust::execution_policy<DerivedPolicy> &exec, |
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InputIterator first, InputIterator last, |
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OutputIterator result, |
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BinaryFunction binary_op) |
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{ |
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typedef typename thrust::iterator_traits<InputIterator>::value_type InputType; |
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if(first == last) |
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{ |
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// empty range, nothing to do |
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return result; |
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} |
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else |
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{ |
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// an in-place operation is requested, copy the input and call the entry point |
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// XXX a special-purpose kernel would be faster here since |
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// only block boundaries need to be copied |
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thrust::detail::temporary_array<InputType, DerivedPolicy> input_copy(exec, first, last); |
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*result = *first; |
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thrust::transform(exec, input_copy.begin() + 1, input_copy.end(), input_copy.begin(), result + 1, binary_op); |
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} |
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return result + (last - first); |
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} |
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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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