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124 lines
4.5 KiB
124 lines
4.5 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/system/detail/generic/transform_scan.h> |
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#include <thrust/scan.h> |
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#include <thrust/iterator/transform_iterator.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 system |
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{ |
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namespace detail |
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{ |
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namespace generic |
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{ |
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template<typename ExecutionPolicy, |
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typename InputIterator, |
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typename OutputIterator, |
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typename UnaryFunction, |
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typename BinaryFunction> |
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OutputIterator transform_inclusive_scan(thrust::execution_policy<ExecutionPolicy> &exec, |
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InputIterator first, |
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InputIterator last, |
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OutputIterator result, |
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UnaryFunction unary_op, |
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BinaryFunction binary_op) |
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{ |
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// the pseudocode for deducing the type of the temporary used below: |
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// |
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// if UnaryFunction is AdaptableUnaryFunction |
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// TemporaryType = AdaptableUnaryFunction::result_type |
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// else if OutputIterator is a "pure" output iterator |
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// TemporaryType = InputIterator::value_type |
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// else |
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// TemporaryType = OutputIterator::value_type |
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// |
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// XXX upon c++0x, TemporaryType needs to be: |
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// result_of<UnaryFunction>::type |
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typedef typename thrust::detail::eval_if< |
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thrust::detail::has_result_type<UnaryFunction>::value, |
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thrust::detail::result_type<UnaryFunction>, |
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thrust::detail::eval_if< |
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thrust::detail::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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>::type ValueType; |
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thrust::transform_iterator<UnaryFunction, InputIterator, ValueType> _first(first, unary_op); |
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thrust::transform_iterator<UnaryFunction, InputIterator, ValueType> _last(last, unary_op); |
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return thrust::inclusive_scan(exec, _first, _last, result, binary_op); |
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} // end transform_inclusive_scan() |
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template<typename ExecutionPolicy, |
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typename InputIterator, |
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typename OutputIterator, |
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typename UnaryFunction, |
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typename T, |
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typename AssociativeOperator> |
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OutputIterator transform_exclusive_scan(thrust::execution_policy<ExecutionPolicy> &exec, |
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InputIterator first, |
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InputIterator last, |
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OutputIterator result, |
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UnaryFunction unary_op, |
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T init, |
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AssociativeOperator binary_op) |
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{ |
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// the pseudocode for deducing the type of the temporary used below: |
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// |
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// if UnaryFunction is AdaptableUnaryFunction |
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// TemporaryType = AdaptableUnaryFunction::result_type |
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// else if OutputIterator is a "pure" output iterator |
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// TemporaryType = InputIterator::value_type |
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// else |
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// TemporaryType = OutputIterator::value_type |
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// |
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// XXX upon c++0x, TemporaryType needs to be: |
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// result_of<UnaryFunction>::type |
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typedef typename thrust::detail::eval_if< |
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thrust::detail::has_result_type<UnaryFunction>::value, |
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thrust::detail::result_type<UnaryFunction>, |
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thrust::detail::eval_if< |
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thrust::detail::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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>::type ValueType; |
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thrust::transform_iterator<UnaryFunction, InputIterator, ValueType> _first(first, unary_op); |
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thrust::transform_iterator<UnaryFunction, InputIterator, ValueType> _last(last, unary_op); |
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return thrust::exclusive_scan(exec, _first, _last, result, init, binary_op); |
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} // end transform_exclusive_scan() |
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} // end namespace generic |
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} // end namespace detail |
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} // end namespace system |
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} // end namespace thrust |
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