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284 lines
11 KiB
284 lines
11 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/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/iterator/iterator_categories.h>
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#include <thrust/iterator/detail/iterator_traversal_tags.h>
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#include <thrust/iterator/detail/is_iterator_category.h>
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#include <thrust/iterator/detail/iterator_category_to_traversal.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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template<typename Category, typename System, typename Traversal>
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struct iterator_category_with_system_and_traversal
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: Category
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{
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}; // end iterator_category_with_system_and_traversal
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// specialize iterator_category_to_system for iterator_category_with_system_and_traversal
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template<typename Category> struct iterator_category_to_system;
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template<typename Category, typename System, typename Traversal>
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struct iterator_category_to_system<iterator_category_with_system_and_traversal<Category,System,Traversal> >
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{
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typedef System type;
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}; // end iterator_category_with_system_and_traversal
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// adapted from http://www.boost.org/doc/libs/1_37_0/libs/iterator/doc/iterator_facade.html#iterator-category
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//
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// in our implementation, R need not be a reference type to result in a category
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// derived from forward_XXX_iterator_tag
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//
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// iterator-category(T,V,R) :=
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// if(T is convertible to input_host_iterator_tag
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// || T is convertible to output_host_iterator_tag
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// || T is convertible to input_device_iterator_tag
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// || T is convertible to output_device_iterator_tag
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// )
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// return T
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//
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// else if (T is not convertible to incrementable_traversal_tag)
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// the program is ill-formed
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//
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// else return a type X satisfying the following two constraints:
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//
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// 1. X is convertible to X1, and not to any more-derived
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// type, where X1 is defined by:
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//
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// if (T is convertible to forward_traversal_tag)
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// {
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// if (T is convertible to random_access_traversal_tag)
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// X1 = random_access_host_iterator_tag
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// else if (T is convertible to bidirectional_traversal_tag)
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// X1 = bidirectional_host_iterator_tag
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// else
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// X1 = forward_host_iterator_tag
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// }
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// else
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// {
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// if (T is convertible to single_pass_traversal_tag
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// && R is convertible to V)
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// X1 = input_host_iterator_tag
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// else
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// X1 = T
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// }
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//
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// 2. category-to-traversal(X) is convertible to the most
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// derived traversal tag type to which X is also convertible,
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// and not to any more-derived traversal tag type.
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template<typename System, typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_default_category;
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// Thrust's implementation of iterator_facade_default_category is slightly
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// different from Boost's equivalent.
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// Thrust does not check is_convertible<Reference, ValueParam> because Reference
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// may not be a complete type at this point, and implementations of is_convertible
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// typically require that both types be complete.
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// Instead, it simply assumes that if is_convertible<Traversal, single_pass_traversal_tag>,
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// then the category is input_iterator_tag
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// this is the function for standard system iterators
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template<typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_default_category_std :
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::forward_traversal_tag>::value,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::random_access_traversal_tag>::value,
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thrust::detail::identity_<std::random_access_iterator_tag>,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::bidirectional_traversal_tag>::value,
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thrust::detail::identity_<std::bidirectional_iterator_tag>,
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thrust::detail::identity_<std::forward_iterator_tag>
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>
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>,
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thrust::detail::eval_if< // XXX note we differ from Boost here
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thrust::detail::is_convertible<Traversal, thrust::single_pass_traversal_tag>::value,
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thrust::detail::identity_<std::input_iterator_tag>,
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thrust::detail::identity_<Traversal>
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>
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>
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{
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}; // end iterator_facade_default_category_std
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// this is the function for host system iterators
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template<typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_default_category_host :
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::forward_traversal_tag>::value,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::random_access_traversal_tag>::value,
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thrust::detail::identity_<thrust::random_access_host_iterator_tag>,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::bidirectional_traversal_tag>::value,
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thrust::detail::identity_<thrust::bidirectional_host_iterator_tag>,
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thrust::detail::identity_<thrust::forward_host_iterator_tag>
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>
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>,
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thrust::detail::eval_if< // XXX note we differ from Boost here
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thrust::detail::is_convertible<Traversal, thrust::single_pass_traversal_tag>::value,
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thrust::detail::identity_<thrust::input_host_iterator_tag>,
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thrust::detail::identity_<Traversal>
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>
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>
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{
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}; // end iterator_facade_default_category_host
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// this is the function for device system iterators
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template<typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_default_category_device :
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::forward_traversal_tag>::value,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::random_access_traversal_tag>::value,
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thrust::detail::identity_<thrust::random_access_device_iterator_tag>,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::bidirectional_traversal_tag>::value,
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thrust::detail::identity_<thrust::bidirectional_device_iterator_tag>,
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thrust::detail::identity_<thrust::forward_device_iterator_tag>
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>
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>,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::single_pass_traversal_tag>::value, // XXX note we differ from Boost here
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thrust::detail::identity_<thrust::input_device_iterator_tag>,
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thrust::detail::identity_<Traversal>
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>
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>
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{
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}; // end iterator_facade_default_category_device
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// this is the function for any system iterators
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template<typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_default_category_any :
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::forward_traversal_tag>::value,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::random_access_traversal_tag>::value,
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thrust::detail::identity_<thrust::random_access_universal_iterator_tag>,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::bidirectional_traversal_tag>::value,
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thrust::detail::identity_<thrust::bidirectional_universal_iterator_tag>,
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thrust::detail::identity_<thrust::forward_universal_iterator_tag>
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>
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>,
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thrust::detail::eval_if<
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thrust::detail::is_convertible<Traversal, thrust::single_pass_traversal_tag>::value, // XXX note we differ from Boost here
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thrust::detail::identity_<thrust::input_universal_iterator_tag>,
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thrust::detail::identity_<Traversal>
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>
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>
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{
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}; // end iterator_facade_default_category_any
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template<typename System, typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_default_category
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// check for any system
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: thrust::detail::eval_if<
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thrust::detail::is_convertible<System, thrust::any_system_tag>::value,
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iterator_facade_default_category_any<Traversal, ValueParam, Reference>,
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// check for host system
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thrust::detail::eval_if<
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thrust::detail::is_convertible<System, thrust::host_system_tag>::value,
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iterator_facade_default_category_host<Traversal, ValueParam, Reference>,
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// check for device system
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thrust::detail::eval_if<
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thrust::detail::is_convertible<System, thrust::device_system_tag>::value,
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iterator_facade_default_category_device<Traversal, ValueParam, Reference>,
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// if we don't recognize the system, get a standard iterator category
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// and combine it with System & Traversal
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thrust::detail::identity_<
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thrust::detail::iterator_category_with_system_and_traversal<
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typename iterator_facade_default_category_std<Traversal, ValueParam, Reference>::type,
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System,
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Traversal
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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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template<typename System, typename Traversal, typename ValueParam, typename Reference>
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struct iterator_facade_category_impl
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{
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typedef typename iterator_facade_default_category<
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System,Traversal,ValueParam,Reference
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>::type category;
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// we must be able to deduce both Traversal & System from category
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// otherwise, munge them all together
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typedef typename thrust::detail::eval_if<
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thrust::detail::and_<
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thrust::detail::is_same<
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Traversal,
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typename thrust::detail::iterator_category_to_traversal<category>::type
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>,
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thrust::detail::is_same<
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System,
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typename thrust::detail::iterator_category_to_system<category>::type
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>
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>::value,
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thrust::detail::identity_<category>,
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thrust::detail::identity_<thrust::detail::iterator_category_with_system_and_traversal<category,System,Traversal> >
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>::type type;
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}; // end iterator_facade_category_impl
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template<typename CategoryOrSystem,
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typename CategoryOrTraversal,
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typename ValueParam,
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typename Reference>
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struct iterator_facade_category
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{
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typedef typename
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thrust::detail::eval_if<
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thrust::detail::is_iterator_category<CategoryOrTraversal>::value,
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thrust::detail::identity_<CategoryOrTraversal>, // categories are fine as-is
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iterator_facade_category_impl<CategoryOrSystem, CategoryOrTraversal, ValueParam, Reference>
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>::type type;
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}; // end iterator_facade_category
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} // end detail
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} // end thrust
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