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95 lines
2.9 KiB
95 lines
2.9 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/host_system_tag.h> |
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#include <thrust/iterator/detail/device_system_tag.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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// XXX WAR circular #inclusion with forward declarations |
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struct random_access_universal_iterator_tag; |
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struct input_universal_iterator_tag; |
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struct output_universal_iterator_tag; |
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namespace detail |
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{ |
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// forward declaration |
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template <typename> struct is_iterator_system; |
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template <typename> struct device_iterator_category_to_backend_system; |
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// XXX this should work entirely differently |
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// we should just specialize this metafunction for iterator_category_with_system_and_traversal |
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template<typename Category> |
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struct iterator_category_to_system |
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// convertible to any iterator? |
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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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detail::identity_<thrust::any_system_tag>, |
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// convertible to host iterator? |
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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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detail::identity_<thrust::host_system_tag>, |
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// convertible to device iterator? |
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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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detail::identity_<thrust::device_system_tag>, |
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// unknown system |
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detail::identity_<void> |
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> // if device |
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> // if host |
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> // if any |
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{ |
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}; // end iterator_category_to_system |
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template<typename CategoryOrTraversal> |
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struct iterator_category_or_traversal_to_system |
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: eval_if< |
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is_iterator_system<CategoryOrTraversal>::value, |
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detail::identity_<CategoryOrTraversal>, |
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iterator_category_to_system<CategoryOrTraversal> |
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> |
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{ |
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}; // end iterator_category_or_traversal_to_system |
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} // end detail |
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} // end thrust |
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