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Refactor generic thrust scan dispatch #6360

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Merged
bernhardmgruber merged 1 commit into from
Oct 28, 2025
Merged

Refactor generic thrust scan dispatch #6360

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36 changes: 26 additions & 10 deletions thrust/thrust/system/detail/generic/scan.h
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Original file line number Diff line number Diff line change
Expand Up @@ -25,48 +25,64 @@
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <thrust/system/detail/generic/tag.h>

#include <thrust/iterator/iterator_traits.h>
#include <thrust/scan.h>
#include <thrust/system/detail/generic/scan.h>

#include <cuda/functional>

THRUST_NAMESPACE_BEGIN
namespace system::detail::generic
{

template <typename ExecutionPolicy, typename InputIterator, typename OutputIterator>
_CCCL_HOST_DEVICE OutputIterator inclusive_scan(
thrust::execution_policy<ExecutionPolicy>& exec, InputIterator first, InputIterator last, OutputIterator result);
thrust::execution_policy<ExecutionPolicy>& exec, InputIterator first, InputIterator last, OutputIterator result)
{
// assume plus as the associative operator
return thrust::inclusive_scan(exec, first, last, result, ::cuda::std::plus<>());
} // end inclusive_scan()

// XXX it is an error to call this function; it has no implementation
// Note: it is an error to call this function: this should be provided by a backend system
template <typename ExecutionPolicy, typename InputIterator, typename OutputIterator, typename BinaryFunction>
_CCCL_HOST_DEVICE OutputIterator inclusive_scan(
thrust::execution_policy<ExecutionPolicy>& exec,
InputIterator first,
InputIterator last,
OutputIterator result,
BinaryFunction binary_op);
BinaryFunction binary_op) = delete;

template <typename ExecutionPolicy, typename InputIterator, typename OutputIterator>
_CCCL_HOST_DEVICE OutputIterator exclusive_scan(
thrust::execution_policy<ExecutionPolicy>& exec, InputIterator first, InputIterator last, OutputIterator result);
thrust::execution_policy<ExecutionPolicy>& exec, InputIterator first, InputIterator last, OutputIterator result)
{
// Use the input iterator's value type per https://wg21.link/P0571
using ValueType = thrust::detail::it_value_t<InputIterator>;
return thrust::exclusive_scan(exec, first, last, result, ValueType{});
}

template <typename ExecutionPolicy, typename InputIterator, typename OutputIterator, typename T>
_CCCL_HOST_DEVICE OutputIterator exclusive_scan(
thrust::execution_policy<ExecutionPolicy>& exec,
InputIterator first,
InputIterator last,
OutputIterator result,
T init);
T init)
{
// assume plus as the associative operator
return thrust::exclusive_scan(exec, first, last, result, init, ::cuda::std::plus<>());
}

// XXX it is an error to call this function; it has no implementation
// Note: it is an error to call this function: this should be provided by a backend system
template <typename ExecutionPolicy, typename InputIterator, typename OutputIterator, typename T, typename BinaryFunction>
_CCCL_HOST_DEVICE OutputIterator exclusive_scan(
thrust::execution_policy<ExecutionPolicy>& exec,
InputIterator first,
InputIterator last,
OutputIterator result,
T init,
BinaryFunction binary_op);
BinaryFunction binary_op) = delete;

} // namespace system::detail::generic
THRUST_NAMESPACE_END

#include <thrust/system/detail/generic/scan.inl>
85 changes: 0 additions & 85 deletions thrust/thrust/system/detail/generic/scan.inl
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