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144 lines
4.8 KiB
144 lines
4.8 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/static_assert.h> |
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#include <thrust/system/detail/generic/scan.h> |
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#include <thrust/iterator/iterator_traits.h> |
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#include <thrust/scan.h> |
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#include <thrust/detail/type_traits.h> |
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#include <thrust/detail/type_traits/iterator/is_output_iterator.h> |
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#include <thrust/functional.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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OutputIterator 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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{ |
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// the pseudocode for deducing the type of the temporary used below: |
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// |
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// 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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typedef typename 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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>::type ValueType; |
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// assume plus as the associative operator |
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return thrust::inclusive_scan(exec, first, last, result, thrust::plus<ValueType>()); |
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} // end 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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OutputIterator 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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{ |
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// the pseudocode for deducing the type of the temporary used below: |
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// |
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// 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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typedef typename 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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>::type ValueType; |
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// assume 0 as the initialization value |
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return thrust::exclusive_scan(exec, first, last, result, ValueType(0)); |
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} // end exclusive_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 T> |
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OutputIterator 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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T init) |
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{ |
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// assume plus as the associative operator |
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return thrust::exclusive_scan(exec, first, last, result, init, thrust::plus<T>()); |
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} // end exclusive_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 BinaryFunction> |
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OutputIterator 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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BinaryFunction binary_op) |
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{ |
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// unimplemented primitive |
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THRUST_STATIC_ASSERT( (thrust::detail::depend_on_instantiation<InputIterator, false>::value) ); |
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return result; |
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} // end 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 T, |
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typename BinaryFunction> |
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OutputIterator 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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T init, |
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BinaryFunction binary_op) |
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{ |
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// unimplemented primitive |
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THRUST_STATIC_ASSERT( (thrust::detail::depend_on_instantiation<InputIterator, false>::value) ); |
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return result; |
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} // end 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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