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87 lines
2.1 KiB
87 lines
2.1 KiB
11 years ago
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/*
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* Copyright 2008-2012 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 ctbbliance 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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#include <thrust/system/cpp/detail/execution_policy.h>
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#include <thrust/iterator/detail/any_system_tag.h>
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#include <thrust/detail/type_traits.h>
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namespace thrust
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{
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namespace system
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{
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// put the canonical tag in the same ns as the backend's entry points
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namespace tbb
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{
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namespace detail
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{
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// this awkward sequence of definitions arise
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// from the desire both for tag to derive
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// from execution_policy and for execution_policy
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// to convert to tag (when execution_policy is not
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// an ancestor of tag)
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// forward declaration of tag
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struct tag;
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// forward declaration of execution_policy
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template<typename> struct execution_policy;
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// specialize execution_policy for tag
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template<>
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struct execution_policy<tag>
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: thrust::system::cpp::detail::execution_policy<tag>
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{};
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// tag's definition comes before the
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// generic definition of execution_policy
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struct tag : execution_policy<tag> {};
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// allow conversion to tag when it is not a successor
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template<typename Derived>
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struct execution_policy
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: thrust::system::cpp::detail::execution_policy<Derived>
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{
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// allow conversion to tag
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inline operator tag () const
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{
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return tag();
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}
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};
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} // end detail
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// alias execution_policy and tag here
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using thrust::system::tbb::detail::execution_policy;
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using thrust::system::tbb::detail::tag;
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} // end tbb
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} // end system
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// alias items at top-level
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namespace tbb
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{
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using thrust::system::tbb::execution_policy;
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using thrust::system::tbb::tag;
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} // end tbb
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} // end thrust
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