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81 lines
2.7 KiB
81 lines
2.7 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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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/system/detail/generic/copy.h>
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#include <thrust/functional.h>
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#include <thrust/detail/internal_functional.h>
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#include <thrust/transform.h>
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#include <thrust/for_each.h>
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#include <thrust/tuple.h>
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#include <thrust/iterator/zip_iterator.h>
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#include <thrust/iterator/detail/minimum_system.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 OutputIterator>
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OutputIterator copy(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator first,
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InputIterator last,
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OutputIterator result)
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{
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typedef typename thrust::iterator_value<InputIterator>::type T;
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return thrust::transform(exec, first, last, result, thrust::identity<T>());
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} // end copy()
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template<typename DerivedPolicy,
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typename InputIterator,
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typename Size,
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typename OutputIterator>
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OutputIterator copy_n(thrust::execution_policy<DerivedPolicy> &exec,
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InputIterator first,
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Size n,
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OutputIterator result)
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{
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typedef typename thrust::iterator_value<InputIterator>::type value_type;
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typedef thrust::identity<value_type> xfrm_type;
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// XXX why do we need to do this? figure out why, and then see if we can do without
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typedef typename thrust::detail::unary_transform_functor<DerivedPolicy,xfrm_type>::type functor_type;
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typedef thrust::tuple<InputIterator,OutputIterator> iterator_tuple;
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typedef thrust::zip_iterator<iterator_tuple> zip_iter;
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zip_iter zipped = thrust::make_zip_iterator(thrust::make_tuple(first,result));
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return thrust::get<1>(thrust::for_each_n(exec, zipped, n, functor_type(xfrm_type())).get_iterator_tuple());
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} // end copy_n()
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} // end generic
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} // end detail
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} // end system
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} // end thrust
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