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62 lines
1.9 KiB
62 lines
1.9 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/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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