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77 lines
2.6 KiB
77 lines
2.6 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/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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