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86 lines
2.1 KiB
86 lines
2.1 KiB
/* |
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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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