derek.holloway
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75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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* Copyright 2008-2018 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <thrust/detail/config.h>
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#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
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# pragma GCC system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
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# pragma clang system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
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# pragma system_header
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#endif // no system header
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#include <thrust/detail/type_deduction.h>
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#include <thrust/system/detail/generic/select_system.h>
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#if _THRUST_HAS_DEVICE_SYSTEM_STD
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# include _THRUST_STD_INCLUDE(type_traits)
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#endif
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THRUST_NAMESPACE_BEGIN
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namespace detail
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{
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// We need a way to compute the return type of `select_system`, which is found
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// by using `thrust::system::detail::generic::select_system` and then making an
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// ADL call. We have no trait that defines the return type. With the
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// limitations of C++11 return type deduction, we need to be able to stick all
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// of that into `decltype`. So, we put the using statement into a detail
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// namespace, and then implement the generic dispatch function in that
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// namespace.
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namespace select_system_detail
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{
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using thrust::system::detail::generic::select_system;
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struct select_system_fn final
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{
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THRUST_EXEC_CHECK_DISABLE
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template <typename DerivedPolicy0>
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THRUST_HOST_DEVICE auto operator()(thrust::detail::execution_policy_base<DerivedPolicy0> const& exec0) const
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THRUST_DECLTYPE_RETURNS(select_system(thrust::detail::derived_cast(thrust::detail::strip_const(exec0))))
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THRUST_EXEC_CHECK_DISABLE
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template <typename DerivedPolicy0, typename DerivedPolicy1>
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THRUST_HOST_DEVICE auto operator()(thrust::detail::execution_policy_base<DerivedPolicy0> const& exec0,
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thrust::detail::execution_policy_base<DerivedPolicy1> const& exec1) const
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THRUST_DECLTYPE_RETURNS(select_system(thrust::detail::derived_cast(thrust::detail::strip_const(exec0)),
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thrust::detail::derived_cast(thrust::detail::strip_const(exec1))))
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};
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} // namespace select_system_detail
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THRUST_INLINE_CONSTANT select_system_detail::select_system_fn select_system{};
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} // namespace detail
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THRUST_NAMESPACE_END
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