TheRock/rocm-libraries/projects/rocthrust/thrust/system/hip/detail/general/various.h

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#pragma once

#include <thrust/detail/config.h>

#include <thrust/detail/type_traits.h>

#include <hip/hip_runtime.h>

#include <type_traits>

THRUST_NAMESPACE_BEGIN
namespace system
{
namespace hip
{
namespace detail
{
template <typename T,
          typename U,
          std::enable_if_t<::rocprim::is_integral<T>::value&& ::rocprim::is_unsigned<U>::value, int> = 0>
THRUST_HOST_DEVICE inline constexpr auto ceiling_div(const T a, const U b)
{
  return a / b + (a % b > 0 ? 1 : 0);
}

THRUST_HOST_DEVICE inline size_t align_size(size_t size, size_t alignment = 256)
{
  return ceiling_div(size, alignment) * alignment;
}

template <class Tuple, class Function, size_t... Indices>
THRUST_HOST_DEVICE inline void apply_to_each_in_tuple_impl(Tuple&& t, Function&& f, thrust::index_sequence<Indices...>)
{
  int swallow[] = {(std::forward<Function>(f)(thrust::get<Indices>(std::forward<Tuple>(t))), 0)...};
  (void) swallow;
}

template <class Tuple, class Function>
THRUST_HOST_DEVICE inline auto apply_to_each_in_tuple(Tuple&& t, Function&& f)
  -> std::void_t<tuple_size<std::remove_reference_t<Tuple>>>
{
  static constexpr size_t size = tuple_size<std::remove_reference_t<Tuple>>::value;
  apply_to_each_in_tuple_impl(std::forward<Tuple>(t), std::forward<Function>(f), thrust::make_index_sequence<size>());
}

} // end namespace detail
} // end namespace hip
} // end namespace system
THRUST_NAMESPACE_END