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111 lines
2.6 KiB
111 lines
2.6 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/type_traits.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/detail/use_default.h> |
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#include <thrust/iterator/iterator_facade.h> |
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namespace thrust |
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{ |
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// forward declaration of iterator_adaptor for iterator_adaptor_base below |
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template<typename Derived, |
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typename Base, |
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typename Value, |
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typename System, |
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typename Traversal, |
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typename Reference, |
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typename Difference |
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> |
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class iterator_adaptor; |
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namespace detail |
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{ |
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// If T is use_default, return the result of invoking |
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// DefaultNullaryFn, otherwise return T. |
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// XXX rename to dflt_help |
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template <class T, class DefaultNullaryFn> |
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struct ia_dflt_help |
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: thrust::detail::eval_if< |
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thrust::detail::is_same<T, thrust::use_default>::value |
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, DefaultNullaryFn |
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, thrust::detail::identity_<T> |
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> |
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{ |
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}; // end ia_dflt_help |
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// A metafunction which computes an iterator_adaptor's base class, |
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// a specialization of iterator_facade. |
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template<typename Derived, |
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typename Base, |
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typename Value, |
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typename System, |
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typename Traversal, |
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typename Reference, |
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typename Difference |
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> |
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struct iterator_adaptor_base |
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{ |
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typedef typename ia_dflt_help< |
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Value, |
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iterator_value<Base> |
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>::type value; |
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typedef typename ia_dflt_help< |
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System, |
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thrust::iterator_system<Base> |
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>::type system; |
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typedef typename ia_dflt_help< |
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Traversal, |
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thrust::iterator_traversal<Base> |
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>::type traversal; |
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typedef typename ia_dflt_help< |
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Reference, |
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thrust::detail::eval_if< |
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thrust::detail::is_same<Value,use_default>::value, |
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thrust::iterator_reference<Base>, |
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thrust::detail::add_reference<Value> |
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> |
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>::type reference; |
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typedef typename ia_dflt_help< |
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Difference, |
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iterator_difference<Base> |
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>::type difference; |
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typedef thrust::iterator_facade< |
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Derived, |
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value, |
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system, |
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traversal, |
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reference, |
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difference |
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> type; |
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}; // end iterator_adaptor_base |
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} // end detail |
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} // end thrust |
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