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61 lines
1.9 KiB
61 lines
1.9 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/detail/type_traits.h> |
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#include <thrust/detail/type_traits/function_traits.h> |
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#include <thrust/detail/type_traits/iterator/is_output_iterator.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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// this trait reports what type should be used as a temporary in certain algorithms |
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// which aggregate intermediate results from a function before writing to an output iterator |
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// the pseudocode for deducing the type of the temporary used below: |
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// |
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// if Function is an AdaptableFunction |
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// result = Function::result_type |
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// else if OutputIterator2 is a "pure" output iterator |
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// result = InputIterator2::value_type |
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// else |
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// result = OutputIterator2::value_type |
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// |
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// XXX upon c++0x, TemporaryType needs to be: |
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// result_of<BinaryFunction>::type |
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template<typename InputIterator, typename OutputIterator, typename Function> |
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struct intermediate_type_from_function_and_iterators |
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: eval_if< |
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has_result_type<Function>::value, |
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result_type<Function>, |
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eval_if< |
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is_output_iterator<OutputIterator>::value, |
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thrust::iterator_value<InputIterator>, |
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thrust::iterator_value<OutputIterator> |
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> |
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> |
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{ |
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}; // end intermediate_type_from_function_and_iterators |
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} // end detail |
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} // end thrust |
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