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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/swap_ranges.h>
#include <thrust/tuple.h>
#include <thrust/iterator/zip_iterator.h>
#include <thrust/detail/internal_functional.h>
#include <thrust/for_each.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
namespace detail
{
// XXX define this here rather than in internal_functional.h
// to avoid circular dependence between swap.h & internal_functional.h
struct swap_pair_elements
{
template <typename Tuple>
__host__ __device__
void operator()(Tuple t)
{
// use unqualified swap to allow ADL to catch any user-defined swap
using thrust::swap;
swap(thrust::get<0>(t), thrust::get<1>(t));
}
}; // end swap_pair_elements
} // end detail
template<typename DerivedPolicy,
typename ForwardIterator1,
typename ForwardIterator2>
__host__ __device__
ForwardIterator2 swap_ranges(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator1 first1,
ForwardIterator1 last1,
ForwardIterator2 first2)
{
typedef thrust::tuple<ForwardIterator1,ForwardIterator2> IteratorTuple;
typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
ZipIterator result = thrust::for_each(exec,
thrust::make_zip_iterator(thrust::make_tuple(first1, first2)),
thrust::make_zip_iterator(thrust::make_tuple(last1, first2)),
detail::swap_pair_elements());
return thrust::get<1>(result.get_iterator_tuple());
} // end swap_ranges()
} // end generic
} // end detail
} // end system
THRUST_NAMESPACE_END
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