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/******************************************************************************
* Copyright (c) 2011-2022, 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 <cub/config.cuh>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <cuda/std/iterator>
#include <cuda/std/type_traits>
#include <cstdint>
CUB_NAMESPACE_BEGIN
namespace detail
{
/**
* ChooseOffsetT checks NumItemsT, the type of the num_items parameter, and
* selects the offset type based on it.
*/
template <typename NumItemsT>
struct ChooseOffsetT
{
// NumItemsT must be an integral type (but not bool).
static_assert(std::is_integral<NumItemsT>::value &&
!std::is_same<typename std::remove_cv<NumItemsT>::type, bool>::value,
"NumItemsT must be an integral type, but not bool");
// Unsigned integer type for global offsets.
using Type =
typename std::conditional<sizeof(NumItemsT) <= 4, std::uint32_t, unsigned long long>::type;
};
/**
* common_iterator_value sets member type to the common_type of
* value_type for all argument types. used to get OffsetT in
* DeviceSegmentedReduce.
*/
template <typename... Iter>
struct common_iterator_value
{
using type = ::cuda::std::__common_type_t<::cuda::std::__iter_value_type<Iter>...>;
};
template <typename... Iter>
using common_iterator_value_t = typename common_iterator_value<Iter...>::type;
} // namespace detail
CUB_NAMESPACE_END
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