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179 lines
5.4 KiB
179 lines
5.4 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/iterator/iterator_categories.h>
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#include <thrust/iterator/detail/iterator_traversal_tags.h>
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#include <thrust/iterator/detail/iterator_category_to_system.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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// XXX WAR circular #inclusion with these forward declarations
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struct bidirectional_universal_iterator_tag;
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struct forward_universal_iterator_tag;
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namespace detail
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{
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// forward declarations
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template <typename> struct is_iterator_system;
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template <typename> struct is_iterator_traversal;
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// make type_traits easy to access
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using namespace thrust::detail;
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template <typename Category>
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struct host_system_category_to_traversal
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: eval_if<
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is_convertible<Category, random_access_host_iterator_tag>::value,
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detail::identity_<random_access_traversal_tag>,
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eval_if<
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is_convertible<Category, bidirectional_host_iterator_tag>::value,
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detail::identity_<bidirectional_traversal_tag>,
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eval_if<
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is_convertible<Category, forward_host_iterator_tag>::value,
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detail::identity_<forward_traversal_tag>,
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eval_if<
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is_convertible<Category, input_host_iterator_tag>::value,
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detail::identity_<single_pass_traversal_tag>,
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eval_if<
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is_convertible<Category, output_host_iterator_tag>::value,
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detail::identity_<incrementable_traversal_tag>,
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void
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>
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>
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>
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>
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>
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{
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}; // end host_system_category_to_traversal
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template <typename Category>
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struct device_system_category_to_traversal
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: eval_if<
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is_convertible<Category, random_access_device_iterator_tag>::value,
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detail::identity_<random_access_traversal_tag>,
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eval_if<
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is_convertible<Category, bidirectional_device_iterator_tag>::value,
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detail::identity_<bidirectional_traversal_tag>,
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eval_if<
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is_convertible<Category, forward_device_iterator_tag>::value,
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detail::identity_<forward_traversal_tag>,
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eval_if<
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is_convertible<Category, input_device_iterator_tag>::value,
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detail::identity_<single_pass_traversal_tag>,
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eval_if<
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is_convertible<Category, output_device_iterator_tag>::value,
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detail::identity_<incrementable_traversal_tag>,
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void
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>
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>
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>
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>
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>
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{
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}; // end device_system_category_to_traversal
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template <typename Category>
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struct any_system_category_to_traversal
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: eval_if<
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is_convertible<Category, random_access_universal_iterator_tag>::value,
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identity_<random_access_traversal_tag>,
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eval_if<
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is_convertible<Category, bidirectional_universal_iterator_tag>::value,
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identity_<bidirectional_traversal_tag>,
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eval_if<
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is_convertible<Category, forward_universal_iterator_tag>::value,
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identity_<forward_traversal_tag>,
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eval_if<
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is_convertible<Category, input_universal_iterator_tag>::value,
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identity_<single_pass_traversal_tag>,
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eval_if<
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is_convertible<Category, output_universal_iterator_tag>::value,
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identity_<incrementable_traversal_tag>,
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// unknown traversal
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void
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>
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>
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>
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>
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>
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{
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}; // end any_system_category_to_traversal
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template<typename Category>
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struct category_to_traversal
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// check for any system
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: eval_if<
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or_<
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is_convertible<Category, thrust::input_universal_iterator_tag>,
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is_convertible<Category, thrust::output_universal_iterator_tag>
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>::value,
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any_system_category_to_traversal<Category>,
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// check for host system
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eval_if<
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or_<
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is_convertible<Category, thrust::input_host_iterator_tag>,
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is_convertible<Category, thrust::output_host_iterator_tag>
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>::value,
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host_system_category_to_traversal<Category>,
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// check for device system
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eval_if<
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or_<
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is_convertible<Category, thrust::input_device_iterator_tag>,
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is_convertible<Category, thrust::output_device_iterator_tag>
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>::value,
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device_system_category_to_traversal<Category>,
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// unknown category
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void
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>
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>
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>
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{};
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template <typename CategoryOrTraversal>
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struct iterator_category_to_traversal
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: eval_if<
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is_iterator_traversal<CategoryOrTraversal>::value,
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detail::identity_<CategoryOrTraversal>,
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category_to_traversal<CategoryOrTraversal>
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>
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{
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}; // end iterator_category_to_traversal
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} // end detail
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} // end thrust
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