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145 lines
4.8 KiB
145 lines
4.8 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/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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