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140 lines
3.5 KiB
140 lines
3.5 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 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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#include <thrust/detail/type_traits.h> |
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#include <thrust/iterator/detail/tagged_iterator.h> |
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#include <thrust/detail/pointer.h> |
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namespace thrust |
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{ |
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namespace detail |
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{ |
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// we can retag an iterator if FromTag converts to ToTag |
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// or vice versa |
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template<typename FromTag, typename ToTag> |
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struct is_retaggable |
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: integral_constant< |
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bool, |
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(is_convertible<FromTag,ToTag>::value || is_convertible<ToTag,FromTag>::value) |
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> |
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{}; |
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template<typename FromTag, typename ToTag, typename Result> |
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struct enable_if_retaggable |
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: enable_if< |
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is_retaggable<FromTag,ToTag>::value, |
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Result |
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> |
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{}; // end enable_if_retaggable |
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} // end detail |
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template<typename Tag, typename Iterator> |
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thrust::detail::tagged_iterator<Iterator,Tag> |
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reinterpret_tag(Iterator iter) |
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{ |
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return thrust::detail::tagged_iterator<Iterator,Tag>(iter); |
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} // end reinterpret_tag() |
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// specialization for raw pointer |
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template<typename Tag, typename T> |
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thrust::pointer<T,Tag> |
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reinterpret_tag(T *ptr) |
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{ |
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return thrust::pointer<T,Tag>(ptr); |
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} // end reinterpret_tag() |
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// specialization for thrust::pointer |
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template<typename Tag, typename T, typename OtherTag, typename Reference, typename Derived> |
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thrust::pointer<T,Tag> |
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reinterpret_tag(thrust::pointer<T,OtherTag,Reference,Derived> ptr) |
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{ |
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return reinterpret_tag<Tag>(ptr.get()); |
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} // end reinterpret_tag() |
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// avoid deeply-nested tagged_iterator |
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template<typename Tag, typename BaseIterator, typename OtherTag> |
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thrust::detail::tagged_iterator<BaseIterator,Tag> |
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reinterpret_tag(thrust::detail::tagged_iterator<BaseIterator,OtherTag> iter) |
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{ |
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return reinterpret_tag<Tag>(iter.base()); |
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} // end reinterpret_tag() |
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template<typename Tag, typename Iterator> |
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typename thrust::detail::enable_if_retaggable< |
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typename thrust::iterator_system<Iterator>::type, |
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Tag, |
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thrust::detail::tagged_iterator<Iterator,Tag> |
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>::type |
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retag(Iterator iter) |
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{ |
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return reinterpret_tag<Tag>(iter); |
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} // end retag() |
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// specialization for raw pointer |
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template<typename Tag, typename T> |
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typename thrust::detail::enable_if_retaggable< |
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typename thrust::iterator_system<T*>::type, |
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Tag, |
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thrust::pointer<T,Tag> |
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>::type |
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retag(T *ptr) |
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{ |
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return reinterpret_tag<Tag>(ptr); |
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} // end retag() |
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// specialization for thrust::pointer |
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template<typename Tag, typename T, typename OtherTag> |
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typename thrust::detail::enable_if_retaggable< |
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OtherTag, |
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Tag, |
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thrust::pointer<T,Tag> |
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>::type |
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retag(thrust::pointer<T,OtherTag> ptr) |
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{ |
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return reinterpret_tag<Tag>(ptr); |
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} // end retag() |
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// avoid deeply-nested tagged_iterator |
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template<typename Tag, typename BaseIterator, typename OtherTag> |
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typename thrust::detail::enable_if_retaggable< |
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OtherTag, |
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Tag, |
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thrust::detail::tagged_iterator<BaseIterator,Tag> |
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>::type |
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retag(thrust::detail::tagged_iterator<BaseIterator,OtherTag> iter) |
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{ |
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return reinterpret_tag<Tag>(iter); |
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} // end retag() |
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} // end thrust |
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