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178 lines
5.4 KiB
178 lines
5.4 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/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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