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188 lines
6.6 KiB
188 lines
6.6 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/uninitialized_copy.h>
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#include <thrust/copy.h>
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#include <thrust/for_each.h>
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#include <thrust/detail/internal_functional.h>
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#include <thrust/detail/type_traits.h>
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#include <thrust/iterator/iterator_traits.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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namespace detail
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{
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template<typename InputType,
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typename OutputType>
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struct uninitialized_copy_functor
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{
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template<typename Tuple>
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__host__ __device__
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void operator()(Tuple t)
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{
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const InputType &in = thrust::get<0>(t);
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OutputType &out = thrust::get<1>(t);
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::new(static_cast<void*>(&out)) OutputType(in);
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} // end operator()()
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}; // end uninitialized_copy_functor
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// non-trivial copy constructor path
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template<typename ExecutionPolicy,
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typename InputIterator,
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typename ForwardIterator>
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ForwardIterator uninitialized_copy(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator first,
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InputIterator last,
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ForwardIterator result,
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thrust::detail::false_type) // has_trivial_copy_constructor
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{
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// zip up the iterators
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typedef thrust::tuple<InputIterator,ForwardIterator> IteratorTuple;
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typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
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ZipIterator begin = thrust::make_zip_iterator(thrust::make_tuple(first,result));
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ZipIterator end = begin;
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// get a zip_iterator pointing to the end
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const typename thrust::iterator_difference<InputIterator>::type n = thrust::distance(first,last);
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thrust::advance(end, n);
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// create a functor
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typedef typename iterator_traits<InputIterator>::value_type InputType;
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typedef typename iterator_traits<ForwardIterator>::value_type OutputType;
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detail::uninitialized_copy_functor<InputType, OutputType> f;
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// do the for_each
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thrust::for_each(exec, begin, end, f);
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// return the end of the output range
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return thrust::get<1>(end.get_iterator_tuple());
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} // end uninitialized_copy()
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// trivial copy constructor path
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template<typename ExecutionPolicy,
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typename InputIterator,
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typename ForwardIterator>
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ForwardIterator uninitialized_copy(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator first,
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InputIterator last,
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ForwardIterator result,
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thrust::detail::true_type) // has_trivial_copy_constructor
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{
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return thrust::copy(exec, first, last, result);
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} // end uninitialized_copy()
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// non-trivial copy constructor path
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template<typename ExecutionPolicy,
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typename InputIterator,
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typename Size,
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typename ForwardIterator>
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ForwardIterator uninitialized_copy_n(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator first,
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Size n,
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ForwardIterator result,
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thrust::detail::false_type) // has_trivial_copy_constructor
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{
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// zip up the iterators
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typedef thrust::tuple<InputIterator,ForwardIterator> IteratorTuple;
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typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
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ZipIterator zipped_first = thrust::make_zip_iterator(thrust::make_tuple(first,result));
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// create a functor
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typedef typename iterator_traits<InputIterator>::value_type InputType;
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typedef typename iterator_traits<ForwardIterator>::value_type OutputType;
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detail::uninitialized_copy_functor<InputType, OutputType> f;
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// do the for_each_n
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ZipIterator zipped_last = thrust::for_each_n(exec, zipped_first, n, f);
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// return the end of the output range
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return thrust::get<1>(zipped_last.get_iterator_tuple());
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} // end uninitialized_copy_n()
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// trivial copy constructor path
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template<typename ExecutionPolicy,
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typename InputIterator,
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typename Size,
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typename ForwardIterator>
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ForwardIterator uninitialized_copy_n(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator first,
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Size n,
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ForwardIterator result,
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thrust::detail::true_type) // has_trivial_copy_constructor
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{
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return thrust::copy_n(exec, first, n, result);
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} // end uninitialized_copy_n()
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} // end detail
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template<typename ExecutionPolicy,
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typename InputIterator,
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typename ForwardIterator>
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ForwardIterator uninitialized_copy(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator first,
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InputIterator last,
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ForwardIterator result)
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{
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typedef typename iterator_traits<ForwardIterator>::value_type ResultType;
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typedef typename thrust::detail::has_trivial_copy_constructor<ResultType>::type ResultTypeHasTrivialCopyConstructor;
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return thrust::system::detail::generic::detail::uninitialized_copy(exec, first, last, result, ResultTypeHasTrivialCopyConstructor());
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} // end uninitialized_copy()
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template<typename ExecutionPolicy,
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typename InputIterator,
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typename Size,
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typename ForwardIterator>
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ForwardIterator uninitialized_copy_n(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator first,
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Size n,
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ForwardIterator result)
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{
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typedef typename iterator_traits<ForwardIterator>::value_type ResultType;
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typedef typename thrust::detail::has_trivial_copy_constructor<ResultType>::type ResultTypeHasTrivialCopyConstructor;
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return thrust::system::detail::generic::detail::uninitialized_copy_n(exec, first, n, result, ResultTypeHasTrivialCopyConstructor());
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} // end uninitialized_copy_n()
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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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