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96 lines
2.9 KiB
96 lines
2.9 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/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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