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103 lines
4.1 KiB
103 lines
4.1 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/gather.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/functional.h>
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#include <thrust/transform.h>
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#include <thrust/iterator/permutation_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 DerivedPolicy,
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typename InputIterator,
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typename RandomAccessIterator,
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typename OutputIterator>
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OutputIterator gather(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator map_first,
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InputIterator map_last,
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RandomAccessIterator input_first,
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OutputIterator result)
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{
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return thrust::transform(exec,
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thrust::make_permutation_iterator(input_first, map_first),
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thrust::make_permutation_iterator(input_first, map_last),
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result,
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thrust::identity<typename thrust::iterator_value<RandomAccessIterator>::type>());
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} // end gather()
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template<typename DerivedPolicy,
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typename InputIterator1,
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typename InputIterator2,
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typename RandomAccessIterator,
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typename OutputIterator>
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OutputIterator gather_if(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator1 map_first,
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InputIterator1 map_last,
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InputIterator2 stencil,
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RandomAccessIterator input_first,
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OutputIterator result)
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{
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typedef typename thrust::iterator_value<InputIterator2>::type StencilType;
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return thrust::gather_if(exec,
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map_first,
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map_last,
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stencil,
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input_first,
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result,
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thrust::identity<StencilType>());
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} // end gather_if()
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template<typename DerivedPolicy,
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typename InputIterator1,
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typename InputIterator2,
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typename RandomAccessIterator,
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typename OutputIterator,
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typename Predicate>
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OutputIterator gather_if(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator1 map_first,
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InputIterator1 map_last,
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InputIterator2 stencil,
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RandomAccessIterator input_first,
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OutputIterator result,
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Predicate pred)
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{
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typedef typename thrust::iterator_value<RandomAccessIterator>::type InputType;
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return thrust::transform_if(exec,
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thrust::make_permutation_iterator(input_first, map_first),
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thrust::make_permutation_iterator(input_first, map_last),
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stencil,
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result,
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thrust::identity<InputType>(),
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pred);
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} // end gather_if()
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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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