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/******************************************************************************
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the NVIDIA CORPORATION nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************/
#pragma once
#include <thrust/detail/config.h>
#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#include <iterator>
#include <thrust/system/cuda/detail/scan.h>
#include <thrust/distance.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
template <class Derived,
class InputIt,
class OutputIt,
class TransformOp,
class ScanOp>
OutputIt __host__ __device__
transform_inclusive_scan(execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result,
TransformOp transform_op,
ScanOp scan_op)
{
// Use the transformed input iterator's value type per https://wg21.link/P0571
using input_type = typename thrust::iterator_value<InputIt>::type;
#if THRUST_CPP_DIALECT < 2017
using result_type = typename std::result_of<TransformOp(input_type)>::type;
#else
using result_type = std::invoke_result_t<TransformOp, input_type>;
#endif
using value_type = typename std::remove_reference<result_type>::type;
typedef typename iterator_traits<InputIt>::difference_type size_type;
size_type num_items = static_cast<size_type>(thrust::distance(first, last));
typedef transform_input_iterator_t<value_type,
InputIt,
TransformOp>
transformed_iterator_t;
return cuda_cub::inclusive_scan_n(policy,
transformed_iterator_t(first, transform_op),
num_items,
result,
scan_op);
}
template <class Derived,
class InputIt,
class OutputIt,
class TransformOp,
class InitialValueType,
class ScanOp>
OutputIt __host__ __device__
transform_exclusive_scan(execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result,
TransformOp transform_op,
InitialValueType init,
ScanOp scan_op)
{
// Use the initial value type per https://wg21.link/P0571
using result_type = typename std::remove_reference<InitialValueType>::type;
typedef typename iterator_traits<InputIt>::difference_type size_type;
size_type num_items = static_cast<size_type>(thrust::distance(first, last));
typedef transform_input_iterator_t<result_type,
InputIt,
TransformOp>
transformed_iterator_t;
return cuda_cub::exclusive_scan_n(policy,
transformed_iterator_t(first, transform_op),
num_items,
result,
init,
scan_op);
}
} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif
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