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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/detail/generic/uninitialized_copy.h>
#include <thrust/copy.h>
#include <thrust/for_each.h>
#include <thrust/detail/internal_functional.h>
#include <thrust/detail/type_traits.h>
#include <thrust/iterator/iterator_traits.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
namespace detail
{
template<typename InputType,
typename OutputType>
struct uninitialized_copy_functor
{
template<typename Tuple>
__host__ __device__
void operator()(Tuple t)
{
const InputType &in = thrust::get<0>(t);
OutputType &out = thrust::get<1>(t);
::new(static_cast<void*>(&out)) OutputType(in);
} // end operator()()
}; // end uninitialized_copy_functor
// non-trivial copy constructor path
template<typename ExecutionPolicy,
typename InputIterator,
typename ForwardIterator>
__host__ __device__
ForwardIterator uninitialized_copy(thrust::execution_policy<ExecutionPolicy> &exec,
InputIterator first,
InputIterator last,
ForwardIterator result,
thrust::detail::false_type) // has_trivial_copy_constructor
{
// zip up the iterators
typedef thrust::tuple<InputIterator,ForwardIterator> IteratorTuple;
typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
ZipIterator begin = thrust::make_zip_iterator(thrust::make_tuple(first,result));
ZipIterator end = begin;
// get a zip_iterator pointing to the end
const typename thrust::iterator_difference<InputIterator>::type n = thrust::distance(first,last);
thrust::advance(end, n);
// create a functor
typedef typename iterator_traits<InputIterator>::value_type InputType;
typedef typename iterator_traits<ForwardIterator>::value_type OutputType;
detail::uninitialized_copy_functor<InputType, OutputType> f;
// do the for_each
thrust::for_each(exec, begin, end, f);
// return the end of the output range
return thrust::get<1>(end.get_iterator_tuple());
} // end uninitialized_copy()
// trivial copy constructor path
template<typename ExecutionPolicy,
typename InputIterator,
typename ForwardIterator>
__host__ __device__
ForwardIterator uninitialized_copy(thrust::execution_policy<ExecutionPolicy> &exec,
InputIterator first,
InputIterator last,
ForwardIterator result,
thrust::detail::true_type) // has_trivial_copy_constructor
{
return thrust::copy(exec, first, last, result);
} // end uninitialized_copy()
// non-trivial copy constructor path
template<typename ExecutionPolicy,
typename InputIterator,
typename Size,
typename ForwardIterator>
__host__ __device__
ForwardIterator uninitialized_copy_n(thrust::execution_policy<ExecutionPolicy> &exec,
InputIterator first,
Size n,
ForwardIterator result,
thrust::detail::false_type) // has_trivial_copy_constructor
{
// zip up the iterators
typedef thrust::tuple<InputIterator,ForwardIterator> IteratorTuple;
typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
ZipIterator zipped_first = thrust::make_zip_iterator(thrust::make_tuple(first,result));
// create a functor
typedef typename iterator_traits<InputIterator>::value_type InputType;
typedef typename iterator_traits<ForwardIterator>::value_type OutputType;
detail::uninitialized_copy_functor<InputType, OutputType> f;
// do the for_each_n
ZipIterator zipped_last = thrust::for_each_n(exec, zipped_first, n, f);
// return the end of the output range
return thrust::get<1>(zipped_last.get_iterator_tuple());
} // end uninitialized_copy_n()
// trivial copy constructor path
template<typename ExecutionPolicy,
typename InputIterator,
typename Size,
typename ForwardIterator>
__host__ __device__
ForwardIterator uninitialized_copy_n(thrust::execution_policy<ExecutionPolicy> &exec,
InputIterator first,
Size n,
ForwardIterator result,
thrust::detail::true_type) // has_trivial_copy_constructor
{
return thrust::copy_n(exec, first, n, result);
} // end uninitialized_copy_n()
} // end detail
template<typename ExecutionPolicy,
typename InputIterator,
typename ForwardIterator>
__host__ __device__
ForwardIterator uninitialized_copy(thrust::execution_policy<ExecutionPolicy> &exec,
InputIterator first,
InputIterator last,
ForwardIterator result)
{
typedef typename iterator_traits<ForwardIterator>::value_type ResultType;
typedef typename thrust::detail::has_trivial_copy_constructor<ResultType>::type ResultTypeHasTrivialCopyConstructor;
return thrust::system::detail::generic::detail::uninitialized_copy(exec, first, last, result, ResultTypeHasTrivialCopyConstructor());
} // end uninitialized_copy()
template<typename ExecutionPolicy,
typename InputIterator,
typename Size,
typename ForwardIterator>
__host__ __device__
ForwardIterator uninitialized_copy_n(thrust::execution_policy<ExecutionPolicy> &exec,
InputIterator first,
Size n,
ForwardIterator result)
{
typedef typename iterator_traits<ForwardIterator>::value_type ResultType;
typedef typename thrust::detail::has_trivial_copy_constructor<ResultType>::type ResultTypeHasTrivialCopyConstructor;
return thrust::system::detail::generic::detail::uninitialized_copy_n(exec, first, n, result, ResultTypeHasTrivialCopyConstructor());
} // end uninitialized_copy_n()
} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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