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/*
* Copyright 2008-2020 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.
*/
/*! \file async/scan.h
* \brief Functions for asynchronously computing prefix scans.
*/
#pragma once
#include <thrust/detail/config.h>
#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 <thrust/detail/cpp14_required.h>
#if THRUST_CPP_DIALECT >= 2014
#include <thrust/detail/execution_policy.h>
#include <thrust/detail/select_system.h>
#include <thrust/detail/static_assert.h>
#include <thrust/system/detail/adl/async/scan.h>
#include <thrust/type_traits/is_execution_policy.h>
#include <thrust/type_traits/logical_metafunctions.h>
#include <thrust/type_traits/remove_cvref.h>
#include <thrust/future.h>
THRUST_NAMESPACE_BEGIN
namespace async
{
// Fallback implementations used when no overloads are found via ADL:
namespace unimplemented
{
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename BinaryOp>
event<DerivedPolicy>
async_inclusive_scan(thrust::execution_policy<DerivedPolicy>&,
ForwardIt,
Sentinel,
OutputIt,
BinaryOp)
{
THRUST_STATIC_ASSERT_MSG(
(thrust::detail::depend_on_instantiation<ForwardIt, false>::value),
"this algorithm is not implemented for the specified system"
);
return {};
}
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename InitialValueType,
typename BinaryOp>
event<DerivedPolicy>
async_exclusive_scan(thrust::execution_policy<DerivedPolicy>&,
ForwardIt,
Sentinel,
OutputIt,
InitialValueType,
BinaryOp)
{
THRUST_STATIC_ASSERT_MSG(
(thrust::detail::depend_on_instantiation<ForwardIt, false>::value),
"this algorithm is not implemented for the specified system"
);
return {};
}
} // namespace unimplemented
namespace inclusive_scan_detail
{
// Include fallback implementation for ADL failures
using thrust::async::unimplemented::async_inclusive_scan;
// Implementation of the thrust::async::inclusive_scan CPO.
struct inclusive_scan_fn final
{
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename BinaryOp>
auto
operator()(thrust::detail::execution_policy_base<DerivedPolicy> const& exec,
ForwardIt&& first,
Sentinel&& last,
OutputIt&& out,
BinaryOp&& op) const
// ADL dispatch.
THRUST_RETURNS(
async_inclusive_scan(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
THRUST_FWD(op)
)
)
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt>
auto
operator()(thrust::detail::execution_policy_base<DerivedPolicy> const& exec,
ForwardIt&& first,
Sentinel&& last,
OutputIt&& out) const
// ADL dispatch.
THRUST_RETURNS(
async_inclusive_scan(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
thrust::plus<>{}
)
)
template <typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename BinaryOp,
typename = std::enable_if_t<!is_execution_policy_v<remove_cvref_t<ForwardIt>>>>
auto operator()(ForwardIt&& first,
Sentinel&& last,
OutputIt&& out,
BinaryOp&& op) const
// ADL dispatch.
THRUST_RETURNS(
async_inclusive_scan(
thrust::detail::select_system(
iterator_system_t<remove_cvref_t<ForwardIt>>{},
iterator_system_t<remove_cvref_t<OutputIt>>{}
),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
THRUST_FWD(op)
)
)
template <typename ForwardIt, typename Sentinel, typename OutputIt>
auto operator()(ForwardIt&& first, Sentinel&& last, OutputIt&& out) const
// ADL dispatch.
THRUST_RETURNS(
async_inclusive_scan(
thrust::detail::select_system(
iterator_system_t<remove_cvref_t<ForwardIt>>{},
iterator_system_t<remove_cvref_t<OutputIt>>{}
),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
thrust::plus<>{}
)
)
};
} // namespace inclusive_scan_detail
THRUST_INLINE_CONSTANT inclusive_scan_detail::inclusive_scan_fn inclusive_scan{};
namespace exclusive_scan_detail
{
// Include fallback implementation for ADL failures
using thrust::async::unimplemented::async_exclusive_scan;
// Implementation of the thrust::async::exclusive_scan CPO.
struct exclusive_scan_fn final
{
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename InitialValueType,
typename BinaryOp>
auto
operator()(thrust::detail::execution_policy_base<DerivedPolicy> const& exec,
ForwardIt&& first,
Sentinel&& last,
OutputIt&& out,
InitialValueType&& init,
BinaryOp&& op) const
// ADL dispatch.
THRUST_RETURNS(
async_exclusive_scan(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
THRUST_FWD(init),
THRUST_FWD(op)
)
)
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename InitialValueType>
auto
operator()(thrust::detail::execution_policy_base<DerivedPolicy> const& exec,
ForwardIt&& first,
Sentinel&& last,
OutputIt&& out,
InitialValueType&& init) const
// ADL dispatch.
THRUST_RETURNS(
async_exclusive_scan(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
THRUST_FWD(init),
thrust::plus<>{}
)
)
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt>
auto
operator()(thrust::detail::execution_policy_base<DerivedPolicy> const& exec,
ForwardIt&& first,
Sentinel&& last,
OutputIt&& out) const
// ADL dispatch.
THRUST_RETURNS(
async_exclusive_scan(
thrust::detail::derived_cast(thrust::detail::strip_const(exec)),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
iterator_value_t<remove_cvref_t<ForwardIt>>{},
thrust::plus<>{}
)
)
template <typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename InitialValueType,
typename BinaryOp,
typename = std::enable_if_t<!is_execution_policy_v<remove_cvref_t<ForwardIt>>>>
auto
operator()(ForwardIt&& first,
Sentinel&& last,
OutputIt&& out,
InitialValueType&& init,
BinaryOp&& op) const
// ADL dispatch.
THRUST_RETURNS(
async_exclusive_scan(
thrust::detail::select_system(
iterator_system_t<remove_cvref_t<ForwardIt>>{},
iterator_system_t<remove_cvref_t<OutputIt>>{}
),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
THRUST_FWD(init),
THRUST_FWD(op)
)
)
template <typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename InitialValueType,
typename = std::enable_if_t<!is_execution_policy_v<remove_cvref_t<ForwardIt>>>>
auto
operator()(ForwardIt&& first,
Sentinel&& last,
OutputIt&& out,
InitialValueType&& init) const
// ADL dispatch.
THRUST_RETURNS(
async_exclusive_scan(
thrust::detail::select_system(
iterator_system_t<remove_cvref_t<ForwardIt>>{},
iterator_system_t<remove_cvref_t<OutputIt>>{}
),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
THRUST_FWD(init),
thrust::plus<>{}
)
)
template <typename ForwardIt, typename Sentinel, typename OutputIt>
auto operator()(ForwardIt&& first,
Sentinel&& last,
OutputIt&& out) const
// ADL dispatch.
THRUST_RETURNS(
async_exclusive_scan(
thrust::detail::select_system(
iterator_system_t<remove_cvref_t<ForwardIt>>{},
iterator_system_t<remove_cvref_t<OutputIt>>{}
),
THRUST_FWD(first),
THRUST_FWD(last),
THRUST_FWD(out),
iterator_value_t<remove_cvref_t<ForwardIt>>{},
thrust::plus<>{}
)
)
};
} // namespace exclusive_scan_detail
THRUST_INLINE_CONSTANT exclusive_scan_detail::exclusive_scan_fn exclusive_scan{};
} // namespace async
THRUST_NAMESPACE_END
#endif
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