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141 lines
3.5 KiB
141 lines
3.5 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 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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