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73 lines
2.5 KiB
73 lines
2.5 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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#include <thrust/iterator/transform_iterator.h>
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#include <thrust/iterator/iterator_adaptor.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/detail/type_traits.h>
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#include <thrust/detail/type_traits/result_of.h>
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namespace thrust
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{
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template <class UnaryFunction, class Iterator, class Reference, class Value>
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class transform_iterator;
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namespace detail
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{
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// Compute the iterator_adaptor instantiation to be used for transform_iterator
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template <class UnaryFunc, class Iterator, class Reference, class Value>
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struct transform_iterator_base
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{
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private:
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// By default, dereferencing the iterator yields the same as the function.
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typedef typename thrust::detail::ia_dflt_help<
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Reference,
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thrust::detail::result_of<UnaryFunc(typename thrust::iterator_value<Iterator>::type)>
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>::type reference;
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// To get the default for Value: remove any reference on the
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// result type, but retain any constness to signal
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// non-writability. Note that if we adopt Thomas' suggestion
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// to key non-writability *only* on the Reference argument,
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// we'd need to strip constness here as well.
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typedef typename thrust::detail::ia_dflt_help<
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Value,
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thrust::detail::remove_reference<reference>
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>::type cv_value_type;
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public:
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typedef thrust::iterator_adaptor
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<
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transform_iterator<UnaryFunc, Iterator, Reference, Value>
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, Iterator
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, cv_value_type
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, thrust::use_default // Leave the system alone
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//, thrust::use_default // Leave the traversal alone
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// use the Iterator's category to let any system iterators remain random access even though
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// transform_iterator's reference type may not be a reference
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// XXX figure out why only iterators whose reference types are true references are random access
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, typename thrust::iterator_traits<Iterator>::iterator_category
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, reference
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> type;
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};
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} // end detail
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} // end thrust
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